CN217444821U - Laser frequency adjustment system - Google Patents
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- CN217444821U CN217444821U CN202221566102.6U CN202221566102U CN217444821U CN 217444821 U CN217444821 U CN 217444821U CN 202221566102 U CN202221566102 U CN 202221566102U CN 217444821 U CN217444821 U CN 217444821U
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Abstract
The application discloses a laser frequency adjustment system. The laser frequency adjusting system provided by the embodiment of the application comprises an acousto-optic frequency shifter, a reflector, a Faraday optical rotator and a polarization beam splitter. The reflector is used for reflecting the linearly polarized light emitted by the acousto-optic frequency shifter after the frequency of the acousto-optic frequency shifter is adjusted for the first time to the acousto-optic frequency shifter for adjusting the frequency of the acousto-optic frequency shifter for the second time. The Faraday rotator is used for adjusting the polarization direction of linearly polarized light with unadjusted frequency entering the polarization beam splitter and adjusting the polarization direction of the linearly polarized light with twice-adjusted emergent frequency of the polarization beam splitter. The polarization beam splitter is used for reflecting the linearly polarized light after twice adjustment to a preset direction. Therefore, the Faraday optical rotator can adjust the polarization direction of linearly polarized light to meet the requirement of the acousto-optic frequency shifter, the linearly polarized light is subjected to primary frequency modulation through the acousto-optic frequency shifter, and then the linearly polarized light is reflected to the acousto-optic frequency shifter by the reflector to be subjected to secondary frequency modulation, so that the large-range frequency adjustment of the linearly polarized light can be realized.
Description
Technical Field
The application relates to the field of acousto-optic frequency shifters, in particular to a laser frequency adjusting system.
Background
In recent years, single-frequency lasers have advantages of narrow line width, low noise and the like, and are widely applied to the fields of atomic clocks, laser atomic cooling, laser radars, precision measurement and the like. Such as laser atomic cooling, is very critical for the center frequency of a single frequency laser. Therefore, the center frequency of the single-frequency laser can be precisely adjusted in practical application. The two-pass optical path scheme based on the acousto-optic frequency shifter can realize 2 times of frequency adjustment. In the related art, the two-pass laser frequency adjusting system is suitable for an acousto-optic frequency shifter without a requirement on the light polarization direction, but the acousto-optic frequency shifter products on the market often have a requirement on the light polarization direction.
SUMMERY OF THE UTILITY MODEL
The embodiment of the application provides a laser frequency adjusting system.
The laser frequency adjusting system provided by the embodiment of the application comprises an acousto-optic frequency shifter, a reflector, a Faraday optical rotator and a polarization beam splitter. The reflector is used for reflecting the linearly polarized light emitted by the acousto-optic frequency shifter after the frequency of the acousto-optic frequency shifter is adjusted for the first time to the acousto-optic frequency shifter for adjusting the frequency of the acousto-optic frequency shifter for the second time. The Faraday rotator is used for adjusting the polarization direction of linearly polarized light with unadjusted frequency entering the polarization beam splitter and adjusting the polarization direction of the linearly polarized light with twice-adjusted emergent frequency of the polarization beam splitter. The polarization beam splitter is used for reflecting the linearly polarized light after twice adjustment to a preset direction.
Therefore, linearly polarized light enters the laser frequency adjusting system, under the adjusting action of the Faraday optical rotator, the polarization direction of the linearly polarized light is changed to meet the requirement of the acousto-optic frequency shifter, the linearly polarized light is subjected to primary frequency modulation through the acousto-optic frequency shifter, and then the linearly polarized light is reflected to the acousto-optic frequency shifter by the reflector to be subjected to secondary frequency modulation, so that the large-range frequency adjustment of the linearly polarized light can be realized.
In some embodiments, the laser frequency adjustment system includes a first half-wave plate, configured to adjust a polarization direction of linearly polarized light that enters the polarization beam splitter and has an unadjusted frequency, so that the linearly polarized light that exits from the first half-wave plate is transmitted through the polarization beam splitter.
In some embodiments, a second half-wave plate is disposed between the faraday rotator and the acousto-optic frequency shifter, and is configured to adjust the polarization direction of the linearly polarized light emitted by the faraday rotator with unadjusted frequency to meet the requirement of the acousto-optic frequency shifter, and further configured to restore the polarization direction of the linearly polarized light emitted by the acousto-optic frequency shifter with twice adjusted frequency to the polarization direction of the linearly polarized light emitted by the faraday rotator with unadjusted frequency.
In some embodiments, the polarization beam splitter is a polarization beam splitting prism, and the predetermined direction is perpendicular to an incident light path of the polarization beam splitter.
In certain embodiments, the laser frequency adjustment system comprises a first lens disposed between the second half-wave plate and the acousto-optic frequency shifter and a second lens disposed between the acousto-optic frequency shifter and the mirror, the first and second lenses for matching a beam waist diameter to a working aperture of the acousto-optic frequency shifter.
In some embodiments, the laser frequency adjustment system comprises a first optical path and a second optical path respectively located on both sides of the acousto-optic frequency shifter;
the first optical path is a linear polarized light optical path with unregulated frequency incident from the acousto-optic frequency shifter, and the first optical path is also a linear polarized light optical path with twice regulated frequency emergent from the acousto-optic frequency shifter;
the second optical path is a linear polarized light path emitted by the acousto-optic frequency shifter and having the once adjusted frequency, and the second optical path is also a linear polarized light path reflected by the reflector and having the once adjusted frequency;
the polarization beam splitter and the Faraday rotator are arranged on the first light path, and the reflector is arranged on the second light path.
In some embodiments, a second half-wave plate is disposed between the faraday rotator and the acousto-optic frequency shifter, and the laser frequency adjustment system comprises a first light barrier disposed on a side of the acousto-optic frequency shifter facing away from the second half-wave plate and on an extension of the first optical path.
In some embodiments, a second half-waveplate is disposed between the faraday rotator and the acousto-optic frequency shifter, and the laser frequency adjustment system comprises a second light baffle disposed on a side of the acousto-optic frequency shifter near the second half-waveplate and on an extension of the second optical path.
In some embodiments, the laser frequency adjustment system further comprises a signal transmitting means for applying a drive signal to the acousto-optic frequency shifter.
In some embodiments, the laser frequency adjustment system comprises an adjustment device for adjusting an angle between the acousto-optic frequency shifter and light incident on the acousto-optic frequency shifter.
Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.
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The above and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic configuration diagram of a laser frequency adjustment system according to an embodiment of the present application.
Description of the main element symbols:
the laser frequency adjusting system 100, the first half-wave plate 11, the Faraday rotator 12, the second half-wave plate 13, the acousto-optic frequency shifter 20, the reflecting mirror 30, the polarization beam splitter 40, the first lens 51, the second lens 52, the first light blocking member 61, the second light blocking member 62 and the signal transmitting device 70.
Detailed Description
Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative and are only for the purpose of explaining the present application and are not to be construed as limiting the present application.
In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and are not to be construed as limiting the present application. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be mechanically connected, may be electrically connected or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or may be connected through the use of two elements or the interaction of two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact of the first and second features, or may comprise contact of the first and second features not directly but through another feature in between. Also, the first feature "on," "above" and "over" the second feature may include the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
The following disclosure provides many different embodiments or examples for implementing different features of the application. In order to simplify the disclosure of the present application, specific example components and arrangements are described below. Of course, they are merely examples and are not intended to limit the present application. Further, the present application may repeat reference numerals and/or reference letters in the various examples for simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or arrangements discussed. In addition, examples of various specific processes and materials are provided herein, but one of ordinary skill in the art may recognize the application of other processes and/or the use of other materials.
Referring to fig. 1, a laser frequency adjustment system 100 according to an embodiment of the present disclosure includes an acousto-optic frequency shifter 20, a mirror 30, a faraday rotator 12, and a polarization splitter 40. The reflector 30 is used for reflecting the linearly polarized light emitted by the acousto-optic frequency shifter 20 after the frequency is adjusted for the first time to the acousto-optic frequency shifter 20 for the second time of frequency adjustment. The faraday rotator 12 is used for adjusting the polarization direction of linearly polarized light with unadjusted frequency entering the polarization beam splitter 40, and is used for adjusting the polarization direction of linearly polarized light with twice adjusted frequency exiting the polarization beam splitter. The polarization beam splitter 40 is used for reflecting the linearly polarized light after twice adjustment to a preset direction.
Therefore, the linearly polarized light enters the laser frequency adjusting system 100, under the adjusting action of the faraday rotator 12, the polarization direction of the linearly polarized light is changed to meet the requirement of the acousto-optic frequency shifter 20, the linearly polarized light is subjected to the first frequency modulation by the acousto-optic frequency shifter 20, and then the linearly polarized light is reflected to the acousto-optic frequency shifter 20 by the reflector 30 to be subjected to the second frequency modulation, so that the wide-range frequency adjustment of the linearly polarized light can be realized.
Specifically, the acousto-optic frequency shifter 20 is composed of an acousto-optic medium and a piezoelectric transducer. The frequency shift of the light is obtained by using acousto-optic interaction, and when the laser is diffracted by the ultrasonic grating through an acousto-optic medium, the propagation direction and the frequency are changed. The acousto-optic frequency shifter 20 has requirements on the polarization direction of linearly polarized light, for example, the partial acousto-optic frequency shifter 20 is only suitable for vertically polarized linearly polarized light, and the partial acousto-optic frequency shifter 20 is only suitable for horizontally polarized linearly polarized light.
By arranging the Faraday optical rotator 12, the polarization direction of linearly polarized light can be adjusted at will, so that the polarization direction of the linearly polarized light is suitable for the acousto-optic frequency shifter 20 with various requirements on different polarization directions, and the harsh requirements of the laser frequency adjusting system 100 on application devices can be reduced.
The Faraday optical rotator enters a laser frequency adjusting system 100, and under the polarization adjustment of the Faraday optical rotator, linearly polarized light is subjected to primary frequency adjustment through a primary acousto-optic frequency shifter 20; the linearly polarized light after being adjusted once by the acousto-optic frequency shifter 20 is reflected from the reflector 30 and passes through the acousto-optic frequency shifter 20 again, so that the frequency of the linearly polarized light emitted from the laser frequency adjusting system 100 is adjusted for the second time, and the frequency of the linearly polarized light meets the actual use requirement. Wherein, the linearly polarized light can be emitted through the single-frequency laser.
Linearly polarized light after twice frequency modulation by the acousto-optic frequency shifter 20 is emitted to the Faraday optical rotator 12, and the Faraday optical rotator 12 can adjust the polarization direction of the linearly polarized light. Linearly polarized light with twice frequency modulation after the polarization direction is adjusted by the Faraday optical rotator 12 is incident to the polarization beam splitter 40, and the polarization beam splitter 40 can reflect the linearly polarized light with twice frequency adjustment to a preset direction, so that the linearly polarized light with twice frequency adjustment and the linearly polarized light without frequency adjustment are split.
More specifically, the faraday rotator 12 is disposed between the polarization splitter 40 and the acousto-optic frequency shifter 20, and the acousto-optic frequency shifter 20 is disposed on the optical axis L of the faraday rotator 12. The mirror 30 can be disposed on a side of the acousto-optic frequency shifter 20 facing away from the faraday rotator 12, and an optical axis of the mirror 30 is inclined from an optical axis L of the faraday rotator 1212.
The linearly polarized light is diffracted after passing through the acousto-optic frequency shifter 20, so that the propagation direction of the linearly polarized light is changed, an inclination angle exists between the optical axis of the reflector 30 and the optical axis L of the Faraday optical rotator 12, the linearly polarized light with the frequency being adjusted for the first time by the acousto-optic frequency shifter 20 can be incident on the reflector 30, and the linearly polarized light with the frequency being adjusted for the first time can be incident on the acousto-optic frequency shifter 20 again for the second time frequency adjustment under the action of the reflector 30.
Referring to fig. 1, in some embodiments, the laser frequency adjustment system 100 may include a first half-wave plate 11, where the first half-wave plate 11 is used to adjust a polarization direction of linearly polarized light with an unadjusted frequency entering the polarization beam splitter 40, so that the linearly polarized light emitted from the first half-wave plate 11 is transmitted through the polarization beam splitter 40.
Thus, the polarization direction of linearly polarized light which is not subjected to frequency modulation can be adjusted at will by combining the Faraday rotator 12 and the first half-wave plate 11, so that the linearly polarized light which is not subjected to frequency modulation is suitable for the acousto-optic frequency shifter 20 which has the requirement on the light polarization direction. Specifically, the first half-wave plate 11 may be disposed on a side of the polarization beam splitter 40 facing away from the faraday rotator 12, and the polarization direction of linearly polarized light that enters the polarization beam splitter 40 and has an unadjusted frequency is adjusted.
Referring to fig. 1, in some embodiments, a second half-wave plate 13 is disposed between the faraday rotator 12 and the acousto-optic frequency shifter 20, the second half-wave plate 13 is used to adjust the polarization direction of the linearly polarized light with the unadjusted frequency emitted from the faraday rotator 12 to meet the requirement of the acousto-optic frequency shifter 20, and the second half-wave plate 13 is also used to restore the polarization direction of the linearly polarized light with the twice adjusted frequency emitted from the acousto-optic frequency shifter 20 to the polarization direction of the linearly polarized light with the unadjusted frequency emitted from the faraday rotator 12.
In this way, by using the faraday optical rotator 12 and the second half-wave plate 13 in combination, the polarization direction of the linearly polarized light can be adjusted to make the linearly polarized light incident to the acousto-optic frequency shifter 20, so that the linearly polarized light without frequency adjustment can be applied to the acousto-optic frequency shifter 20 with the requirement on the light polarization direction.
In one embodiment, the laser frequency adjustment system 100 may include a first half-wave plate 11 and a second half-wave plate 13. The first half-wave plate 11 may be arranged on the side of the polarization splitter 40 facing away from the faraday rotator 12 and the second half-wave plate 13 is arranged close to the acousto-optic frequency shifter 20. The first half-wave plate 11 can adjust the polarization direction of linearly polarized light with unadjusted frequency to a first polarization direction; the Faraday rotator 12 can adjust the polarization direction of linearly polarized light with unadjusted frequency emitted by the first half-wave plate 11 to be a second polarization direction; the second half-wave plate 13 can adjust the polarization direction of linearly polarized light having an unadjusted frequency emitted from the faraday rotator 12 to a third polarization direction. When the polarization direction of the linearly polarized light incident to the acousto-optic frequency shifter 20 is the third polarization direction, the linearly polarized light can satisfy the acousto-optic frequency shifter 20 having the requirement on the light polarization direction.
In this way, the faraday optical rotator 12, the first half-wave plate 11 and the second half-wave plate 13 are used in combination, so that the polarization direction of linearly polarized light with unadjusted frequency can be adjusted at will, and the linearly polarized light with unadjusted frequency is suitable for the acousto-optic frequency shifter 20 with the requirement on the light polarization direction.
Specifically, the faraday rotator 12 is a device that operates using the faraday effect, and can rotate the polarization directions of forward and backward incident laser lights by the same angle in the same direction. The faraday effect is that when linearly polarized light passes through a medium, a vibration plane of the light rotates when a magnetic field parallel to the propagation direction of the light is applied to the medium. The polarization direction of the laser light passing through the faraday rotator 12 changes only depending on the magnetic field direction and the sign of the verdet constant, which is closely related to the wavelength and decreases as the wavelength increases. If linearly polarized light passes through the faraday rotator first, passes through the mirror 30 and then passes through the faraday rotator again, the rotation angle is twice the rotation angle in a single pass.
The faraday optical rotator 12 selected by the embodiment of the application is a 45-degree optical rotator, and when laser passes through the faraday optical rotator 12 in the forward direction and then passes through the faraday optical rotator 12 in the reverse direction, the polarization direction of linearly polarized light with the final frequency adjusted twice can be rotated by 90 degrees compared with linearly polarized light without frequency adjustment, so that the linearly polarized light with the frequency adjusted twice and the linearly polarized light without frequency adjustment can be split conveniently.
In yet another embodiment, the acousto-optic frequency shifter 20 requires the polarization direction of the light incident on the acousto-optic frequency shifter 20 to be vertical polarization, and the first half wave plate 11 and the second half wave plate 13 are both half wave plates, also known as λ/2 glass plates. Linearly polarized light enters the first half-wave plate 11 from the side of the first half-wave plate 11 away from the faraday rotator 12, and the first half-wave plate 11 is adjusted so that the polarization direction of the linearly polarized light is horizontally polarized. Linearly polarized light exits from the first half-wave plate 11, and then enters the faraday rotator 12 from the direction of the faraday rotator 12 away from the second half-wave plate 13, and the polarization direction of the linearly polarized light is deflected by 45 degrees by the faraday rotator 12. Linearly polarized light exits the faraday rotator 12 and then enters the second half-wave plate 13, and the second half-wave plate 13 is adjusted so that the polarization direction of the linearly polarized light is vertically polarized. After linearly polarized light is adjusted by the Faraday optical rotator 12, the first half-wave plate 11 and the second half-wave plate 13, the polarization direction of the linearly polarized light is changed into vertical polarization, so that the requirement of the acousto-optic frequency shifter 20 on the polarization of the linearly polarized light is matched, and the linearly polarized light emitted from the second half-wave plate 13 can be adjusted in frequency after passing through the acousto-optic frequency shifter 20.
The second half-wave plate 13 is further configured to adjust the polarization direction of the linearly polarized light reflected by the mirror 30 and passing through the acousto-optic frequency shifter 20 to a second polarization direction, and the faraday optical rotator 12 is further configured to adjust the polarization direction of the linearly polarized light emitted by the second half-wave plate 13 to a third polarization direction.
In this way, the second half-wave plate 13 can adjust the polarization direction of the linearly polarized light reflected by the mirror 30 and passing through the acousto-optic frequency shifter 20 to the second polarization direction, so as to be the same as the polarization direction of the linearly polarized light emitted from the acousto-optic frequency shifter 20 to the second half-wave plate 13, when the linearly polarized light passes through the faraday rotator 12, the rotation angle of the polarization direction of the linearly polarized light with twice adjusted frequencies is twice as large as the polarization direction of the linearly polarized light with twice unadjusted frequencies before the first half-wave plate 11 emits to the faraday rotator 12, so that the linearly polarized light with twice adjusted frequencies can be split from the linearly polarized light without being adjusted frequencies.
Specifically, after the linearly polarized light sequentially passes through the first half-wave plate 11, the faraday optical rotator 12, the second half-wave plate 13 and the acousto-optic frequency shifter 20, the polarization direction of the linearly polarized light is a third polarization direction. Because the reflecting mirror 30 does not change the polarization direction of the light, the polarization direction of the linearly polarized light after the frequency reflected by the reflecting mirror 30 is adjusted once is still the third polarization direction. After the linearly polarized light with the once adjusted frequency enters the reflecting mirror 30, the linearly polarized light is reflected by the acousto-optic frequency shifter 20 again, and because the polarization direction of the linearly polarized light with the once adjusted frequency emitted from the reflecting mirror 30 is still the third polarization direction, the linearly polarized light with the once adjusted frequency emitted from the reflecting mirror 30 can meet the acousto-optic frequency shifter 20 with requirements on the light polarization direction. That is, when the linearly polarized light with the polarization direction of the third polarization direction after the primary frequency adjustment enters the acousto-optic frequency shifter 20, the acousto-optic frequency shifter 20 can perform the secondary frequency adjustment on the linearly polarized light.
In one embodiment, the acousto-optic frequency shifter 20 requires a perpendicular polarization to the polarization direction of the light incident on the acousto-optic frequency shifter 20, and both the first half-wave plate 11 and the second half-wave plate 13 are half-wave plates. The linearly polarized light with unadjusted frequency has a polarization direction of horizontal polarization after passing through the first half-wave plate 11, and then enters the faraday optical rotator 12, the second half-wave plate 13 and the acousto-optic frequency shifter 20, the polarization direction of the linearly polarized light with unadjusted frequency is adjusted to vertical polarization, and the linearly polarized light has a primary frequency adjustment. After the linear polarized light with the first adjusted frequency passes through the acousto-optic frequency shifter 20 by the reflection of the reflector 30, the second frequency adjustment is performed. The linearly polarized light with the twice adjusted frequency exits from the acousto-optic frequency shifter 20, and then enters the second half-wave plate 13 from the second half-wave plate 13 in the direction close to the acousto-optic frequency shifter 20, and the second half-wave plate 13 is adjusted to enable the polarization direction of the linearly polarized light with the twice adjusted frequency to deflect 45 degrees. The linearly polarized light with the twice adjusted frequency is emitted from the second half-wave plate 13, and then is emitted into the faraday optical rotator 12 from the direction on the faraday optical rotator 12 close to the second half-wave plate 13, and the faraday optical rotator 12 deflects the polarization direction of the linearly polarized light with the twice adjusted frequency by 45 degrees, namely, the polarization direction of the linearly polarized light with the twice adjusted frequency is vertical polarization, so that the linearly polarized light with the twice adjusted frequency can be separated from the linearly polarized light with the unadjusted frequency, and the linearly polarized light with the twice adjusted frequency can enter a subsequent optical path or an application system.
In some embodiments, the polarization beam splitter 40 may be a polarization beam splitter prism, and the predetermined direction Y is perpendicular to an incident light path of the polarization beam splitter 40.
In this way, the polarization beam splitter 40 can reflect the linearly polarized light emitted from the faraday rotator 12 and having the frequency twice adjusted to the predetermined direction Y. The polarization beam splitter 40 changes the light path direction of the linearly polarized light, so that the linearly polarized light with twice adjusted frequency can be separated from the linearly polarized light with unadjusted frequency, and the linearly polarized light with twice adjusted frequency can enter a subsequent light path or an application system. The incident optical path of the polarization beam splitter 40 and the optical axis L of the faraday rotator 12 are located on the same straight line.
Specifically, the linearly polarized light with twice adjusted frequency is emitted from the faraday rotator 12, then enters the polarization beam splitter 40, is reflected by the beam splitting surface of the polarization beam splitter 40, so that the linearly polarized light with twice adjusted frequency is separated from the linearly polarized light with unadjusted frequency, and is reflected to the preset direction Y to enter a subsequent optical path or an application system without being interfered by the linearly polarized light with unadjusted frequency.
Referring to fig. 1, in some embodiments, the laser frequency adjustment system 100 may include a first lens 51 and a second lens 52, the first lens 51 being disposed between the second half-wave plate 13 and the acousto-optic frequency shifter 20, the second lens 52 being disposed between the acousto-optic frequency shifter 20 and the mirror 30, the first lens 51 and the second lens 52 being configured to match a beam waist diameter to a working aperture of the acousto-optic frequency shifter 20.
In this way, the first lens 51 can match the beam waist diameter of the linearly polarized light with unadjusted frequency to the working aperture of the acousto-optic frequency shifter 20, so that the acousto-optic frequency shifter 20 can perform frequency adjustment on the linearly polarized light. The second lens 52 can match the beam waist diameter of the linearly polarized light after the primary frequency adjustment with the working aperture of the acousto-optic frequency shifter 20, so that the acousto-optic frequency shifter 20 can perform the secondary frequency adjustment on the linearly polarized light.
In addition, the first lens 51 and the second lens 52 are used for adjustment, so that the direction of the linearly polarized light with twice adjusted frequency is not deflected, that is, the propagation direction of the linearly polarized light with once adjusted frequency can be collinear with the propagation direction of the linearly polarized light with unadjusted frequency without deflection.
Specifically, the first lens 51 may be disposed on the optical axis L of the faraday rotator 12, and the second lens 52 may be disposed on the optical axis of the mirror 30. Therefore, between the second half-wave plate 13 and the reflecting mirror 30, a diffraction optical path of linearly polarized light with unadjusted frequency after passing through the acousto-optic frequency shifter 20 is collinear with an incident optical path of linearly polarized light with once adjusted frequency, and an incident optical path of linearly polarized light with unadjusted frequency before being incident on the acousto-optic frequency shifter 20 is collinear with a diffraction optical path of linearly polarized light with twice adjusted frequency after being incident on the polarization beam splitter 40. In one embodiment, the first lens 51 and the second lens 52 may be convex lenses.
Referring to fig. 1, in some embodiments, the laser frequency adjustment system 100 includes a first optical path a1 and a second optical path a2 respectively disposed at two sides of the acousto-optic frequency shifter 20.
The first optical path a1 is an optical path of linearly polarized light with unadjusted frequency incident by the acousto-optic frequency shifter 20, and the first optical path a1 is also an optical path of linearly polarized light with twice-adjusted frequency emitted by the acousto-optic frequency shifter 20.
The second optical path a2 is an optical path of the linearly polarized light emitted by the acousto-optic frequency shifter 20 after the frequency is adjusted once, and the second optical path a2 is also an optical path of the linearly polarized light reflected by the reflecting mirror 30 after the frequency is adjusted once. The polarization beam splitter 40 and the faraday rotator 12 are disposed on the first optical path a1, and the mirror 30 is disposed on the second optical path a 2.
Therefore, linearly polarized light with unadjusted frequency can be incident to the acousto-optic frequency shifter 20 along the first optical path a1 to perform first frequency modulation, linearly polarized light with once-adjusted frequency can be incident to the reflecting mirror 30 along the second optical path a2, linearly polarized light with once-adjusted frequency can be reflected to the acousto-optic frequency shifter 20 along the second optical path a2 to perform second frequency modulation through reflection of the emitter, linearly polarized light with twice-adjusted frequency can be incident to the polarization beam splitter 40 along the first optical path a1, and the polarization beam splitter 40 can reflect linearly polarized light with twice-adjusted frequency to a predetermined direction, so that the linearly polarized light with twice-adjusted frequency and the linearly polarized light with unadjusted frequency are split.
Referring to fig. 1, in some embodiments, a second half-wave plate 13 is disposed between the faraday rotator 12 and the acousto-optic frequency shifter 20, and the laser frequency adjusting system 100 may include a first light blocking member 61, wherein the first light blocking member 61 is disposed on a side of the acousto-optic frequency shifter 20 facing away from the second half-wave plate 13 and located on an extension line of the first optical path a 1.
Thus, when linearly polarized light with unadjusted frequency enters the acousto-optic frequency shifter 20, the linearly polarized light without modulation can penetrate through the acousto-optic frequency shifter 20 and can be emitted to the first light blocking member 61, so that the laser can be prevented from damaging other equipment or workers. Specifically, the first light blocking member 61 may be disposed on the optical axis L of the faraday rotator 12, and linearly polarized light that is not modulated by the acousto-optic frequency shifter 20 propagates along the optical axis L of the faraday rotator 12 to the first light blocking member 61.
In some embodiments, a second half-waveplate 13 is disposed between the faraday rotator 12 and the acousto-optic frequency shifter 20, and the laser frequency adjustment system 100 includes a second light baffle 62, the second light baffle 62 is disposed on the side of the acousto-optic frequency shifter 20 close to the second half-waveplate 13 and on the extension line of the second optical path a 2.
Thus, when the linearly polarized light with the primary adjusted frequency enters the acousto-optic frequency shifter 20, the linearly polarized light without modulation can be transmitted through the acousto-optic frequency shifter 20 to the second light blocking member 62, so that the laser can be prevented from damaging other devices or workers. In particular, the second light barrier 62 may be arranged on the optical axis of the mirror 30 without passing through the acousto-optic frequency shifter 20
The modulated linearly polarized light propagates along the optical axis of the reflecting mirror 30 to the second light blocking member 62.
Referring to fig. 1, in some embodiments, the laser frequency adjustment system 100 further includes a signal transmitting device 70, and the signal transmitting device 70 is configured to apply a driving signal to the acousto-optic frequency shifter 20. Thus, the linearly polarized light with unadjusted frequency is modulated by the acousto-optic frequency shifter 20, and the frequency of the linearly polarized light with unadjusted frequency is adjusted to be the sum of the original frequency of the linearly polarized light with unadjusted frequency and the frequency of the driving signal, so that the frequency modulation of the linearly polarized light with unadjusted frequency is realized. Similarly, when the linearly polarized light with the primary adjusted frequency emitted from the reflector 30 passes through the acousto-optic frequency shifter 20, the frequency of the linearly polarized light with the primary adjusted frequency is adjusted to be the sum of the original frequency of the linearly polarized light with the primary adjusted frequency and the frequency of the driving signal, so that the frequency modulation of the linearly polarized light with the primary adjusted frequency is realized, that is, the frequency modulation of the linearly polarized light is performed for the second time.
In some embodiments, the laser frequency adjustment system 100 may further include an adjustment device for adjusting an angle between the acousto-optic frequency shifter 20 and the linearly polarized light incident on the acousto-optic frequency shifter 20. So, adjusting device can be used for adjusting the position of reputation frequency shifter 20, is the contained angle of reputation frequency shifter 20 and the unadjusted linearly polarized light of frequency promptly for the unadjusted linearly polarized light of frequency enters into reputation frequency shifter 20 with better angle, thereby promotes reputation frequency shifter 20's frequency modulation efficiency.
It should be noted that, when the mirror 30 reflects the linearly polarized light emitted by the acousto-optic frequency shifter 20 after the frequency is adjusted once to the acousto-optic frequency shifter 20, the position of the acousto-optic frequency shifter 20 can be kept unchanged, and the linearly polarized light after the frequency is adjusted once can still enter the acousto-optic frequency shifter 20 at a better angle, so as to improve the frequency modulation efficiency of the acousto-optic frequency shifter 20.
In conclusion, the laser can emit linearly polarized light, the linearly polarized light enters the laser frequency adjustment system 100, the linearly polarized light with unadjusted frequency sequentially passes through the first half-wave plate 11, the faraday optical rotator 12 and the second half-wave plate 13, and under the adjustment action of the first half-wave plate 11, the faraday optical rotator 12 and the second half-wave plate 13, the polarization direction of the linearly polarized light is changed to match the acousto-optic frequency shifter 20 required by the polarization direction. The adjusting device is controlled to change the included angle between the acousto-optic frequency shifter 20 and the linearly polarized light with unadjusted frequency, so that the frequency modulation efficiency of the linearly polarized light with unadjusted frequency entering the acousto-optic frequency shifter 20 is higher. The control signal transmitting device 70 applies a driving signal to the acousto-optic frequency shifter 20, wherein linearly polarized light with unadjusted frequency enters the acousto-optic frequency shifter 20 and is diffracted, and the frequency of the linearly polarized light which is diffracted is the sum of the original frequency of the linearly polarized light and the frequency of the driving signal. Linearly polarized light which is not modulated by the acousto-optic frequency shifter 20 is transmitted through the acousto-optic frequency shifter 20 and emitted to
The first flag 61 prevents the laser from damaging equipment or personnel.
The linearly polarized light after passing through the acousto-optic frequency shifter 20 and having the primary adjusted frequency returns to the reflecting mirror 30, so that the linearly polarized light having the primary adjusted frequency can be frequency-modulated for the second time through the acousto-optic frequency shifter 20, and the linearly polarized light having the secondary adjusted frequency can sequentially pass through the second half-wave plate 13 and the faraday optical rotator 12 to be incident to the polarization beam splitter 40. Under the adjusting action of the Faraday rotator 12 and the second half-wave plate 13, the polarization direction of linearly polarized light is changed. The rotation angle of the polarization direction of the linearly polarized light after the frequency adjustment twice by the faraday rotator 12 is twice the polarization direction of the linearly polarized light before the first half-wave plate 11 exits to the faraday rotator 12 and the frequency is not adjusted. Linearly polarized light which is emitted from the Faraday optical rotator 12 and has twice adjusted frequency is reflected by a beam splitting surface of the polarization beam splitter 40, so that the linearly polarized light with twice adjusted frequency and the linearly polarized light with unadjusted frequency are split, and the linearly polarized light with twice adjusted frequency can enter a subsequent optical path or an application system. The frequency which is not frequency-modulated by the acousto-optic frequency shifter 20 is once adjusted, and then transmitted through the acousto-optic frequency shifter 20 to the second light-blocking member 62 to prevent the laser from damaging the equipment or personnel.
In the description of the present specification, reference to the description of "one embodiment", "certain embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present application have been shown and described, it will be understood by those of ordinary skill in the art that: numerous changes, modifications, substitutions and variations can be made to the embodiments without departing from the principles and spirit of the application, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. A laser frequency adjustment system, comprising:
the acousto-optic frequency shifter is used for carrying out reciprocating frequency adjustment twice on the linearly polarized light;
the reflector is used for reflecting the linearly polarized light emitted by the acousto-optic frequency shifter after the frequency of the acousto-optic frequency shifter is adjusted for the first time to the acousto-optic frequency shifter for adjusting the frequency of the acousto-optic frequency shifter for the second time;
the Faraday optical rotator is used for adjusting the polarization direction of linearly polarized light with unadjusted frequency entering the polarization beam splitter and adjusting the polarization direction of the linearly polarized light with twice-adjusted emergent frequency of the polarization beam splitter; and
and the polarization beam splitter is used for reflecting the linearly polarized light with the frequency adjusted twice to a preset direction.
2. The laser frequency adjusting system according to claim 1, wherein the laser frequency adjusting system comprises a first half-wave plate, and is configured to adjust a polarization direction of linearly polarized light which enters the polarization beam splitter and has an unadjusted frequency, so that the linearly polarized light emitted from the first half-wave plate is transmitted through the polarization beam splitter.
3. The laser frequency adjustment system according to claim 1, wherein a second half-wave plate is disposed between the faraday rotator and the acousto-optic frequency shifter, the second half-wave plate is configured to adjust the polarization direction of the linearly polarized light with the unadjusted frequency emitted from the faraday rotator to meet the requirement of the acousto-optic frequency shifter, and the second half-wave plate is further configured to restore the polarization direction of the linearly polarized light with the twice adjusted frequency emitted from the acousto-optic frequency shifter to the polarization direction of the linearly polarized light with the unadjusted frequency emitted from the faraday rotator.
4. The laser frequency adjustment system according to claim 1, wherein the polarization beam splitter is a polarization beam splitter prism, and the predetermined direction is perpendicular to an incident optical path of the polarization beam splitter.
5. The laser frequency adjustment system of claim 3, comprising a first lens and a second lens, the first lens disposed between the second half-wave plate and the acousto-optic frequency shifter, the second lens disposed between the acousto-optic frequency shifter and the mirror, the first lens and the second lens for matching a beam waist diameter to a working aperture of the acousto-optic frequency shifter.
6. The laser frequency adjustment system of claim 1, comprising a first optical path and a second optical path respectively located on both sides of the acousto-optic frequency shifter;
the first optical path is a linear polarized light path with unadjusted frequency incident by the acousto-optic frequency shifter, and the first optical path is also a linear polarized light path with twice-adjusted frequency emergent by the acousto-optic frequency shifter;
the second optical path is a linear polarized light path emitted by the acousto-optic frequency shifter and having the once adjusted frequency, and the second optical path is also a linear polarized light path reflected by the reflector and having the once adjusted frequency;
the polarization light splitter and the Faraday optical rotator are arranged on the first light path, and the reflecting mirror is arranged on the second light path.
7. The laser frequency adjustment system according to claim 6, wherein a second half-wave plate is arranged between the faraday rotator and the acousto-optic frequency shifter, the laser frequency adjustment system comprising a first flag arranged on a side of the acousto-optic frequency shifter facing away from the second half-wave plate and on an extension of the first optical path.
8. The laser frequency adjustment system of claim 6, wherein a second half-wave plate is disposed between the faraday rotator and the acousto-optic frequency shifter, and the laser frequency adjustment system comprises a second baffle disposed on a side of the acousto-optic frequency shifter near the second half-wave plate and on an extension of the second optical path.
9. The laser frequency adjustment system of claim 1, further comprising a signal emitting device for applying a drive signal to the acousto-optic frequency shifter.
10. The laser frequency adjustment system of claim 1, comprising an adjustment device for adjusting an angle of the acousto-optic frequency shifter with respect to light incident on the acousto-optic frequency shifter.
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CN202221566102.6U CN217444821U (en) | 2022-06-21 | 2022-06-21 | Laser frequency adjustment system |
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Address after: 230088 floor 1-4, zone a, building E2, phase II, innovation industrial park, No. 2800, innovation Avenue, high tech Zone, Hefei, Anhui Province Patentee after: Guoyi Quantum Technology (Hefei) Co.,Ltd. Address before: 230088 floor 1-4, zone a, building E2, phase II, innovation industrial park, No. 2800, innovation Avenue, high tech Zone, Hefei, Anhui Province Patentee before: Guoyi Quantum (Hefei) Technology Co.,Ltd. |