CN112952538A - Optical fiber laser - Google Patents
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- CN112952538A CN112952538A CN201911259375.9A CN201911259375A CN112952538A CN 112952538 A CN112952538 A CN 112952538A CN 201911259375 A CN201911259375 A CN 201911259375A CN 112952538 A CN112952538 A CN 112952538A
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 53
- 239000000835 fiber Substances 0.000 claims abstract description 131
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- 230000015572 biosynthetic process Effects 0.000 description 1
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- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/0675—Resonators including a grating structure, e.g. distributed Bragg reflectors [DBR] or distributed feedback [DFB] fibre lasers
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- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/106—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity
- H01S3/1061—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity using a variable absorption device
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- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/11—Mode locking; Q-switching; Other giant-pulse techniques, e.g. cavity dumping
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- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/11—Mode locking; Q-switching; Other giant-pulse techniques, e.g. cavity dumping
- H01S3/1123—Q-switching
- H01S3/127—Plural Q-switches
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- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/14—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range characterised by the material used as the active medium
- H01S3/16—Solid materials
- H01S3/1601—Solid materials characterised by an active (lasing) ion
- H01S3/1603—Solid materials characterised by an active (lasing) ion rare earth
- H01S3/1618—Solid materials characterised by an active (lasing) ion rare earth ytterbium
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- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/08—Construction or shape of optical resonators or components thereof
- H01S3/081—Construction or shape of optical resonators or components thereof comprising three or more reflectors
- H01S3/082—Construction or shape of optical resonators or components thereof comprising three or more reflectors defining a plurality of resonators, e.g. for mode selection or suppression
- H01S3/0823—Construction or shape of optical resonators or components thereof comprising three or more reflectors defining a plurality of resonators, e.g. for mode selection or suppression incorporating a dispersive element, e.g. a prism for wavelength selection
- H01S3/0826—Construction or shape of optical resonators or components thereof comprising three or more reflectors defining a plurality of resonators, e.g. for mode selection or suppression incorporating a dispersive element, e.g. a prism for wavelength selection using a diffraction grating
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- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
- H01S3/0941—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a laser diode
- H01S3/09415—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a laser diode the pumping beam being parallel to the lasing mode of the pumped medium, e.g. end-pumping
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- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/11—Mode locking; Q-switching; Other giant-pulse techniques, e.g. cavity dumping
- H01S3/1123—Q-switching
- H01S3/113—Q-switching using intracavity saturable absorbers
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Abstract
The first resonant cavity of the optical fiber laser comprises a fourth grating, a first active optical fiber and a first feedback element, the first end of the fourth grating is connected with the first feedback element through the first active optical fiber, the second resonant cavity comprises a second grating, a second active optical fiber and a second feedback element, the first end of the second grating is connected with the second feedback element through the second active optical fiber, a Q switch is arranged in the first resonant cavity or the second resonant cavity, a pumping source is connected with a pumping end of a beam combiner, a signal end or an output end of the beam combiner is connected into the second resonant cavity and connected with the second active optical fiber, and the second end of the second grating or the second end of the fourth grating is connected with an output port of the optical fiber laser. The active and passive dual Q-switching of the laser is beneficial to reducing the pulse width of the fiber laser, improving the peak power and expanding the application of the fiber laser.
Description
[ technical field ] A method for producing a semiconductor device
The application relates to the technical field of laser, in particular to a fiber laser.
[ background of the invention ]
In recent years, fiber lasers have become one of the research hotspots in the laser field, and have been widely used in many fields, such as laser processing, laser medical treatment, optical communication, national defense and military, and scientific research.
In the existing optical fiber laser, a stable standing wave is formed based on grating feedback and then resonated in an F-P cavity, modulation is carried out through saturation absorption of an optical fiber, and currently passive Q-switching is mainly based on saturable absorption modulation schemes such as graphene, carbon nano tubes and semiconductor saturated absorption mirrors, so that full optical fiber cannot be achieved, and the cost is high. While pure active Q-switching realizes full optical fiber, the pulse width cannot be compressed to be narrow, and stable high-energy pulse is difficult to obtain. The two schemes of single passive Q adjustment and single active Q adjustment have no good application space in industrial mass production. For the traditional fiber laser at present, active and passive dual Q-switching of full fiber can not be realized.
Therefore, it is necessary to provide a fiber laser which can realize full fiber, stable pulse energy, narrow pulse width, high peak power, and is suitable for industrial mass production.
[ summary of the invention ]
The application aims to provide a fiber laser which can realize full fiber, has stable high-energy pulse and narrow pulse width and high peak value.
In order to realize the purpose of the application, the following technical scheme is provided:
the application provides a fiber laser, which comprises a first resonant cavity, a second resonant cavity, a pumping source and a beam combiner, the first resonant cavity comprises a fourth grating, a first active optical fiber and a first feedback element, a first end of the fourth grating is connected with the first feedback element through the first active optical fiber, the second resonant cavity comprises a second grating, a second active optical fiber and a second feedback element, a first end of the second grating is connected with the second feedback element through the second active optical fiber, and a Q switch is arranged in the first resonant cavity or the second resonant cavity, the beam combiner comprises a pumping end, a signal end and an output end, the pumping source is connected with the pumping end of the beam combiner, the signal end or the output end of the beam combiner is connected with the second resonant cavity and is connected with the second active optical fiber, and the second end of the second grating or the second end of the fourth grating is connected with the output port of the optical fiber laser.
In some embodiments, the first resonant cavity is located within the second resonant cavity, the first resonant cavity overlaps with the second resonant cavity, or the second resonant cavity and the first resonant cavity are sequentially disposed.
The pump source generates laser under electric excitation and enters the second active optical fiber through the beam combiner to form a spontaneous emission ASE broadband spectrum, when the Q switch is in a closed state, energy accumulation is formed in the second active optical fiber, when the Q switch is turned on, the first feedback element and the second feedback element form giant pulse first laser under the feedback selection, the first laser wavelength is in a first active optical fiber absorption spectral line, the first active optical fiber, the inner cavity feedback unit and the fourth grating form a laser resonant cavity, under the excitation of the first laser energy, the first active fiber generates stimulated absorption to the first laser to form population inversion, and feeding back the second laser with narrower pulse width by the first feedback element and the fourth grating, amplifying the second laser again by the first active optical fiber, and outputting the second laser through an output port of the laser.
The laser output with different photon energies can be formed through feedback adjustment of the grating, and the working mode comprises continuous and pulse. The scheme can adjust the size of energy stored in the outer cavity through the working duty ratio of the Q switch, is beneficial to reducing the pulse width of the optical fiber laser, improving the peak power, expanding the application of the optical fiber laser and completely realizing full optical fiber.
In some embodiments, the Q-switch may be disposed between the fourth grating and the first active fiber, or between the first active fiber and the first feedback element, or between the fourth grating and the second active fiber, or between the second active fiber and the second grating.
In some embodiments, the first feedback element is a third grating, the second feedback element is a first grating, a first end of the fourth grating is connected to a second end of the third grating through the first active fiber, a second end of the fourth grating is connected to a first end of the second grating through the second active fiber, and a first end of the third grating is connected to the first grating. The laser uses the first active fiber as a saturable absorber to form passive Q-switching, and uses the Q-switch as an active modulation device to form active Q-switching. In the pulse forming process, the Q switch plays an active modulation role, the first active optical fiber plays a passive modulation role, and active and passive dual Q-switching is formed.
Principle of this embodiment: the pump source generates laser under electric excitation and enters the second active optical fiber through the beam combiner to form a spontaneous emission ASE broadband spectrum, when the Q switch is in a closed state, energy accumulation is formed in the second active optical fiber, when the Q switch is turned on, the feedback selection of the first grating and the second grating forms giant pulse first laser, the first laser wavelength is in the absorption spectral line of the first active optical fiber, the third grating and the fourth grating form a laser resonant cavity, under the excitation of the first laser energy, Yb ions in the first active fiber generate stimulated absorption to the first laser to form population inversion, and feeding back through a third grating and a fourth grating to form second laser with narrower pulse width, amplifying the second laser through the first active fiber, and enabling the second laser to reach the output device through the output end of the beam combiner.
In other embodiments, the first feedback element is a third grating, the second feedback element is a first grating, a first end of the fourth grating is connected to a second end of the first grating through the first active fiber, a second end of the fourth grating is connected to a first end of the second grating through the second active fiber, and a first end of the first grating is connected to the third grating.
In other embodiments, the first feedback element and the second feedback element are the same broadband mirror, and the first end of the fourth grating is connected to the broadband mirror through the first active fiber.
In other embodiments, the first feedback element and the second feedback element are the same first grating, and the first end of the fourth grating is connected to the first grating through the first active fiber.
In some embodiments, the beam combiner is disposed outside the second resonant cavity, a signal end of the beam combiner is connected to the second resonant cavity through the second end of the second grating and is connected to the second active fiber, or an output end of the beam combiner is connected to the second resonant cavity through the first end of the second feedback element and is connected to the second active fiber. The beam combiner carries out reverse pumping on the first active optical fiber, the conversion efficiency is high, the loss in the cavity is reduced, the threshold value generated by the second laser is reduced, and the laser resonance condition is greatly reduced in principle.
In other embodiments, the beam combiner is disposed inside the second resonant cavity and outside the first resonant cavity, the beam combiner is connected between the second end of the fourth grating and the second active fiber, and the output end of the beam combiner is connected to the second active fiber.
In a specific embodiment, the output port of the fiber laser is connected to an output device, and the output device is an isolator or a collimator.
In a specific embodiment, the first active fiber and the second active fiber are Yb rare-earth ion doped fibers. The Yb ions in the first active fiber generate stimulated absorption on the first laser to form population inversion.
In some embodiments, the number of the pumping sources is N, wherein N is a natural number, and in some embodiments, N is a natural number between 1 and 19. In other embodiments, the number of pump sources may be 2.
In a specific embodiment, the pumping source includes, but is not limited to, a semiconductor chip pumping source, and the wavelength of the pumping source is in a range of 800-1000 nm.
In a specific embodiment, the beam combiner includes, but is not limited to, a (N +1) x1 beam combiner, where N is any natural number. In some embodiments, N is a natural number from 1 to 19.
In some embodiments, the first grating center wavelength λ1Is 200 of<λ1<1600, reflectivity R1Is 0<R1<1; the central wavelength λ of the second grating2Is 200 of<λ2<1600, reflectivity R2Is 0<R2<1; the third grating center wavelength lambda3Is 200 of<λ3<1600, reflectivity R3Is 0<R3<1; the fourth grating center wavelength lambda4Is 200 of<λ4<1600, reflectivity R4Is 0<R4<1。
Compared with the prior art, the method has the following advantages:
at present, the traditional optical fiber laser cannot realize active and passive dual Q-switching of full optical fibers.
This application forms passively transferring Q through regard as saturable absorber with first active fiber, and the Q switch forms actively transferring Q as active modulator, and at the pulse formation in-process, the Q switch plays the initiative modulating action, and first active fiber forms passively modulating, realizes the active and passive dual transfer Q of this application.
The laser output with different photon energies can be formed through feedback adjustment of the grating, and the working mode comprises continuous and pulse. The scheme can adjust the size of the energy stored in the outer cavity through the working duty ratio of the Q switch, is beneficial to reducing the pulse width of the optical fiber laser, improving the peak power, expanding the application of the optical fiber laser, and can completely realize full optical fiber.
Moreover, the saturable absorber is the Yb-doped ion fiber, Yb in the fiber is a metal ion, and the Yb rare earth ion-doped fiber is used as the saturable absorber because of the specific energy level structure of the rare earth ion Yb. Therefore, the rare earth ion doped optical fiber is used as the saturable absorber, the use of a saturable absorption mirror can be omitted, and a full optical fiber light path can be realized.
[ description of the drawings ]
FIG. 1 is a schematic diagram of a first embodiment of a fiber laser according to the present application;
FIG. 2 is a schematic diagram of a second embodiment of a fiber laser according to the present application;
FIG. 3 is a schematic diagram of a third embodiment of a fiber laser according to the present application;
FIG. 4 is a schematic diagram of a fourth embodiment of a fiber laser of the present application;
FIG. 5 is a schematic diagram of a fifth embodiment of a fiber laser of the present application;
FIG. 6 is a schematic diagram of a sixth embodiment of a fiber laser of the present application;
FIG. 7 is a schematic diagram of a seventh embodiment of a fiber laser of the present application;
FIG. 8 is a schematic diagram of an eighth embodiment of a fiber laser of the present application;
FIG. 9 is a schematic diagram of a fiber laser according to the ninth embodiment of the present application;
FIG. 10 is a schematic diagram of a fiber laser in accordance with one embodiment of the present application;
fig. 11 is a schematic diagram of an eleventh embodiment of the fiber laser of the present application.
[ detailed description ] embodiments
Referring to fig. 1, a first embodiment of a fiber laser in the present application includes a first resonant cavity, a second resonant cavity, a pump source 900, a beam combiner 800, and an output device 101, where the first resonant cavity is located in the second resonant cavity, the first resonant cavity includes a fourth grating 400, a first active fiber 500, and a first feedback element, the second resonant cavity includes a second grating 200, a second active fiber 600, and a second feedback element, in this embodiment, the first feedback element is a third grating 300, and the second feedback element is a first grating 100.
The beam combiner 800 in the first embodiment is disposed outside the second resonant cavity, the beam combiner 800 includes a pump end connected to the pump source 900, an output end connected to the output device 101, and a signal end connected to the second active fiber 600, and the signal end of the beam combiner 800 is connected to the second resonant cavity and connected to the second active fiber 600 through the second end of the second grating 200. The pumping source 900 is connected to the pumping end of the beam combiner 800, the signal end of the beam combiner 800 is connected to the second resonant cavity and to the second active fiber 600, the first end of the second grating 200 is connected to the second end of the fourth grating 400 through the second active fiber 600, the second end of the second grating 200 is connected to the output port of the fiber laser, and the output port of the fiber laser is connected to the output device 101. A first end of the fourth grating 400 is connected to a second end of the third grating 300 through the first active fiber 500, a Q-switch 700 is disposed between the fourth grating 400 and the third grating 300, and a first end of the third grating 300 is connected to the first grating 100. Specifically, the Q-switch is disposed between the fourth grating 400 and the first active fiber 500.
The laser uses the first active fiber as a saturable absorber to form passive Q-switching, and uses the Q-switch as an active modulation device to form active Q-switching. In the pulse forming process, the Q switch plays an active modulation role, and the first active optical fiber plays a passive modulation role. The first active fiber 500 and the second active fiber 600 are Yb rare-earth ion doped fibers. The Yb ions in the first active fiber generate stimulated absorption on the first laser to form population inversion.
In this embodiment, the Q switch is an active Q switch, and may specifically be an acousto-optic Q switch, an electro-optic Q switch, or a mechanical Q switch (e.g., a rotating mirror Q switch).
The output device in this embodiment is a collimator 101, and in other embodiments, the output device may also adopt an isolator.
In this embodiment, the number of the pumping sources 900 is 2, the pumping sources 900 include but are not limited to semiconductor chip pumping sources, and the wavelength range is 800-1000 nm. The combiner 800 includes, but is not limited to, a (N +1) x1 combiner, where N is any natural number. The first grating center wavelength lambda1Is 200 of<λ1<1600, reflectivity R1Is 0<R1<1; the central wavelength λ of the second grating2Is 200 of<λ2<1600, reflectivity R2Is 0<R2<1; the third grating center wavelength lambda3Is 200 of<λ3<1600, reflectivity R3Is 0<R3<1; the fourth grating center wavelength lambda4Is 200 of<λ4<1600, reflectivity R4Is 0<R4<1. The working mode of the optical fiber laser comprises continuous or pulse.
Principle of this embodiment: the pump source 900 generates laser light under electrical excitation and enters the second active optical fiber 600 through the beam combiner 800, forming a spontaneous emission ASE broadband spectrum, when the Q-switch 700 is in the off state, energy builds up within the second active optical fiber 600, when the Q-switch 700 is turned on, the feedback selection of the first grating 100 and the second grating 200 forms a giant pulse first laser, the first laser wavelength is within the absorption line of the first active fiber 500, the first active fiber 500 forms a laser resonator with the third grating 300 and the fourth grating 400, under the excitation of the first laser energy, the Yb ions in the first active fiber 500 produce stimulated absorption to the first laser, form population inversion, the second laser with narrower pulse width is formed by the feedback of the third grating 300 and the fourth grating 400, the second laser is amplified again by the first active fiber 500, the second laser light reaches the output device 101 via the output end of the beam combiner 800. The laser output with different photon energies can be formed through feedback adjustment of the grating, and the working mode comprises continuous and pulse. The size that the outer chamber stored energy can be adjusted through the duty cycle of Q switch to this scheme, is favorable to dwindling the pulse width of fiber laser, promotes peak power, expands the application of pulse fiber laser, and first active fiber 500 is as saturable absorber in this application, saturable absorber is Yb rare earth ion doping optic fibre, and Yb in the optic fibre is a metal ion, and Yb rare earth ion doping is because the peculiar energy level structure of rare earth ion Yb as saturable absorber. Therefore, the rare earth ion doped optical fiber is used as a saturable absorber, and a full optical fiber light path can be realized. Moreover, the beam combiner 800 performs reverse pumping on the first active optical fiber 500, so that the conversion efficiency is high, the intra-cavity loss can be reduced, the threshold generated by the second laser is reduced, and the laser resonance condition is greatly reduced in principle.
Referring to fig. 2, a second embodiment of the present application is a schematic diagram, and a difference between the second embodiment and the first embodiment is that an output port of the fiber laser is connected to an isolator 102.
Referring to fig. 3, a third embodiment of the present application is schematically illustrated, and the difference between the third embodiment and the first embodiment is that the Q-switch is disposed between the fourth grating and the second active fiber.
Referring to fig. 4, a fourth schematic diagram of an embodiment of the present application is different from the second embodiment in that the first feedback element and the second feedback element are the same broadband mirror 110, the first resonant cavity includes the fourth grating 400, the first active fiber 500 and the broadband mirror 110, and the second resonant cavity includes the second grating 200, the second active fiber 600 and the broadband mirror 110. The second grating 200 is connected to the second end of the fourth grating 400 through the second active fiber 600, the first end of the fourth grating 400 is connected to the broadband reflecting mirror 110 through the first active fiber 500, and the Q-switch 700 is connected between the first end of the fourth grating 400 and the first active fiber 500.
Referring to fig. 5, a fifth embodiment of the present disclosure is a schematic diagram, and a difference between the fifth embodiment and the fourth embodiment is that the first feedback element and the second feedback element are the same first grating 100, and the output port of the laser is connected to an isolator. The first resonant cavity includes the fourth grating 400, the first active fiber 500, and the first grating 100, and the second resonant cavity includes the second grating 200, the second active fiber 600, and the first grating 100. The second grating 200 is connected to the second end of the fourth grating 400 through the second active fiber 600, the first end of the fourth grating 400 is connected to the first grating 100 through the first active fiber 500, and the Q-switch 700 is connected between the first end of the fourth grating 400 and the first active fiber 500.
Referring to fig. 6, a sixth schematic diagram of an embodiment of the present application is different from the first embodiment in that the beam combiner 800 in the sixth embodiment is disposed inside the second resonant cavity and outside the first resonant cavity, the beam combiner 800 is connected between the second end of the fourth grating 400 and the second active fiber 600, and an output end of the beam combiner 800 is connected to the second active fiber 600.
Referring to fig. 7, a seventh schematic view is illustrated, which is different from the fourth schematic view in that the beam combiner 800 in the seventh schematic view is disposed inside the second resonant cavity and outside the first resonant cavity, the beam combiner 800 is connected between the second end of the fourth grating 400 and the second active fiber 600, and an output end of the beam combiner 800 is connected to the second active fiber 600.
Referring to fig. 8, an eighth embodiment of the present application is schematically illustrated, and a difference between the eighth embodiment and the first embodiment is that the first resonant cavity and the second resonant cavity in the eighth embodiment are overlapped. Specifically, the first resonant cavity includes a third grating 300, a first active fiber 500, and a fourth grating 400, the second resonant cavity includes a first grating 100, a second active fiber 600, and a second grating 200, a second end of the third grating 300 is connected to a first end of the first grating 100, a second end of the first grating 100 is connected to a first end of the fourth grating 400 after being connected to the first active fiber 500, a second end of the fourth grating 400 is connected to a first end of the second grating 200 after being connected to the second active fiber 600, a second end of the second grating 200 is connected to a signal end of the beam combiner 800, a pump end of the beam combiner 800 is connected to a pump source 900, and an output end of the beam combiner 800 is connected to an output device. A Q-switch 700 is disposed between the first active fiber 500 and the fourth grating 400.
Referring to fig. 9, a ninth embodiment of the present application is schematically illustrated, and the ninth embodiment is different from the eighth embodiment in that a Q-switch 700 is disposed between the first grating 100 and the first active fiber 500.
Referring to fig. 10, a tenth embodiment of the present application is schematically illustrated, and a tenth embodiment is different from the ninth embodiment in that a Q-switch 700 is disposed between the fourth grating 400 and the second active fiber 600.
Referring to fig. 11, an eleventh embodiment of the present application is a schematic diagram, and the difference between the eleventh embodiment and the previous embodiments is that the second resonant cavity and the first resonant cavity are sequentially disposed. Specifically, the first resonant cavity includes a third grating 300, a first active fiber 500, and a fourth grating 400, and the second resonant cavity includes a first grating 100, a second active fiber 600, and a second grating 200. The pumping source 900 is connected to the pumping end of the beam combiner 800, the output end of the beam combiner 800 is connected to the first end of the first grating 100, the second end of the first grating 100 is connected to the first end of the second grating 200 after being connected to the second active fiber 600, the second end of the second grating 200 is connected to the first end of the third grating 300, the second end of the third grating 300 is connected to the first end of the fourth grating 400 after being connected to the first active fiber 500, and the second end of the fourth grating 400 is connected to the output device. The Q-switch 700 is disposed between the second active optical fiber 600 and the second grating 200.
In fact, the arrangement of the Q-switch 700 is not limited to the above-mentioned embodiments, and all equivalent changes based on the present application are within the protection scope of the present application, and are not exhaustive.
The above description is only a preferred embodiment of the present application, and the protection scope of the present application is not limited thereto, and any equivalent changes based on the technical solutions of the present application are included in the protection scope of the present application.
Claims (10)
1. A fiber laser is characterized in that the fiber laser comprises a first resonant cavity, a second resonant cavity, a pumping source and a beam combiner, the first resonant cavity comprises a fourth grating, a first active optical fiber and a first feedback element, a first end of the fourth grating is connected with the first feedback element through the first active optical fiber, the second resonant cavity comprises a second grating, a second active optical fiber and a second feedback element, a first end of the second grating is connected with the second feedback element through the second active optical fiber, and a Q switch is arranged in the first resonant cavity or the second resonant cavity, the beam combiner comprises a pumping end, a signal end and an output end, the pumping source is connected with the pumping end of the beam combiner, the signal end or the output end of the beam combiner is connected with the second resonant cavity and is connected with the second active optical fiber, and the second end of the second grating or the second end of the fourth grating is connected with the output port of the optical fiber laser.
2. The fibre laser of claim 1 wherein the first resonant cavity is located within the second resonant cavity, the first resonant cavity overlaps the second resonant cavity or the second resonant cavity is located in sequence with the first resonant cavity.
3. The fiber laser of claim 2, wherein the Q-switch is provided between the fourth grating and the first active fiber, or between the first active fiber and the first feedback element, or between the fourth grating and the second active fiber, or between the second active fiber and the second grating.
4. The fiber laser of claim 3, wherein the first feedback element is a third grating, the second feedback element is a first grating, a first end of the fourth grating is connected to a second end of the third grating through the first active fiber, a second end of the fourth grating is connected to a first end of the second grating through the second active fiber, and the first end of the third grating is connected to the first grating.
5. The fiber laser of claim 3, wherein the first feedback element is a third grating, the second feedback element is a first grating, a first end of the fourth grating is connected to a second end of the first grating through the first active fiber, a second end of the fourth grating is connected to a first end of the second grating through the second active fiber, and the first end of the first grating is connected to the third grating.
6. The fiber laser of claim 3, wherein the first feedback element and the second feedback element are the same broadband mirror, and the first end of the fourth grating is connected to the broadband mirror through the first active fiber.
7. The fiber laser of claim 3, wherein the first feedback element and the second feedback element are a same first grating, and a first end of the fourth grating is connected to the first grating through the first active fiber.
8. The fiber laser of any of claims 4 to 7, wherein the beam combiner is disposed outside the second resonant cavity, a signal end of the beam combiner is connected to the second resonant cavity through a second end of the second grating and to the second active fiber, or an output end of the beam combiner is connected to the second resonant cavity through a first end of the second feedback element and to the second active fiber.
9. The fiber laser of any of claims 4 to 7, wherein the beam combiner is disposed inside the second resonant cavity and outside the first resonant cavity, the beam combiner is connected between the second end of the fourth grating and the second active fiber, and an output end of the beam combiner is connected to the second active fiber.
10. The fiber laser of claim 1 or 2, wherein an output port of the fiber laser is connected to an output device, the output device being an isolator or a collimator; the first active fiber and the second active fiber are Yb rare earth ion doped fibers.
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| CN201911259375.9A CN112952538A (en) | 2019-12-10 | 2019-12-10 | Optical fiber laser |
| PCT/CN2020/132656 WO2021115145A1 (en) | 2019-12-10 | 2020-11-30 | Fiber laser |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911259375.9A CN112952538A (en) | 2019-12-10 | 2019-12-10 | Optical fiber laser |
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Cited By (2)
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| CN113258422A (en) * | 2021-07-14 | 2021-08-13 | 武汉锐科光纤激光技术股份有限公司 | Seed source of pulse optical fiber laser and pulse adjusting method |
| CN114725762A (en) * | 2022-04-07 | 2022-07-08 | 中国人民解放军国防科技大学 | Intermediate infrared saturable absorber and all-fiber intermediate infrared pulse laser |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115513764B (en) * | 2022-09-15 | 2024-07-19 | 香港理工大学深圳研究院 | All-optical Q-switched switch, all-optical Q-switched laser and pulse laser output method thereof |
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| WO2021115145A1 (en) | 2021-06-17 |
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