CN113471796A - Passive Q-switched laser intracavity pumping type mid-infrared dual-band laser - Google Patents
Passive Q-switched laser intracavity pumping type mid-infrared dual-band laser Download PDFInfo
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Abstract
一种被动调Q激光内腔抽运式中红外双波段激光器，它属于激光技术领域，解决现有主动调Q激光器外腔抽运单块晶体光参量振荡器很难同时有效输出3μm～5μm和8μm～12μm两个波段的激光，且存在复杂性的问题。一种被动调Q激光内腔抽运式中红外双波段激光器，它包括泵浦源、变换透镜、基频光全反镜、增益介质、热补偿透镜、二色镜、可饱和吸收体、基频光半波片、偏振分光镜、第一参量光全反镜、第一非线性晶体、第一输出镜、第二参量光全反镜、第二非线性晶体和第二输出镜。本发明用于被动调Q激光内腔抽运式中红外双波段激光器。
A passive Q-switched laser inner cavity pumped mid-infrared dual-band laser belongs to the field of laser technology and solves the problem that the existing active Q-switched laser external cavity pumping single crystal optical parametric oscillator is difficult to effectively output 3 μm to 5 μm and 8 μm at the same time. ~12μm laser with two wavelength bands, and there is a problem of complexity. A passive Q-switched laser inner cavity pumped mid-infrared dual-band laser, which includes a pump source, a conversion lens, a fundamental frequency optical total reflection mirror, a gain medium, a thermal compensation lens, a dichromatic mirror, a saturable absorber, a base Frequency-optical half-wave plate, polarization beam splitter, first parametric light total reflection mirror, first nonlinear crystal, first output mirror, second parametric light total reflection mirror, second nonlinear crystal and second output mirror. The invention is used for passive Q-switched laser inner cavity pumping type mid-infrared dual-band laser.
Description
Technical Field
The invention belongs to the technical field of laser.
Background
3-5 μm and 8-12 μm in the middle infrared spectral region are not only in the atmospheric transparent window wave band, but also in the intrinsic absorption band of many hydrocarbon oxides, so that the method can be widely used in the fields of atmospheric remote sensing and communication, remote chemical remote sensing, spectroscopy and the like. The existing optical parametric oscillator based on the frequency down-conversion technology can realize the full coverage of the laser with 2-20 μm of the whole intermediate infrared band, has the characteristics of full solidification, continuous tuning, high power/high energy output and the like, and has important significance for the laser spectrum expansion and the development of the all-solid-state intermediate infrared laser. Currently, the method of using an active Q-switched laser external cavity pumping monolithic crystal optical parametric oscillator is the main approach to obtain mid-infrared laser, however, the following two problems mainly exist in the technology: 1, a nonlinear crystal is difficult to have the performances of large nonlinear coefficient, wide light-transmitting wave band, high damage threshold and the like, so that an optical parametric oscillator adopting the crystal is difficult to simultaneously and effectively output laser with two wave bands of 3-5 microns and 8-12 microns; the 2 active Q-switched laser needs to adopt energy consumption equipment to realize pulse modulation, and the energy consumption equipment and the parametric oscillation cavity belong to two independent devices, so that the complexity of the whole laser system is increased, and the development cost of the devices is increased.
Disclosure of Invention
The invention aims to solve the problems that the external cavity pumping monolithic crystal optical parametric oscillator of the existing active Q-switched laser is difficult to simultaneously and effectively output laser with two wave bands of 3-5 mu m and 8-12 mu m, and the complexity exists, and provides a passive Q-switched laser intracavity pumping type mid-infrared dual-wave band laser.
A passive Q-switched laser intracavity pumping type mid-infrared dual-band laser comprises a pumping source, a conversion lens, a fundamental frequency light total reflection mirror, a gain medium, a thermal compensation lens, a dichroic mirror, a saturable absorber, a fundamental frequency light half-wave plate, a polarization beam splitter, a first parametric light total reflection mirror, a first nonlinear crystal, a first output mirror, a second parametric light total reflection mirror, a second nonlinear crystal and a second output mirror;
the 3-5 mu m waveband laser working module consists of a fundamental frequency light total reflection mirror, a gain medium, a thermal compensation lens, a dichroic mirror, a saturable absorber, a fundamental frequency light half-wave plate, a polarization spectroscope, a first parameter light total reflection mirror, a first nonlinear crystal and a first output mirror; the fundamental frequency light total reflection mirror, the gain medium, the thermal compensation lens, the dichroic mirror, the saturable absorber, the fundamental frequency light half-wave plate, the polarization beam splitter, the first parameter light total reflection mirror, the first nonlinear crystal and the first output mirror are sequentially arranged along the output direction of the light path; wherein the first parametric light total reflection mirror, the first nonlinear crystal and the first output mirror form a 3-5 μm parametric oscillator;
the 8-12 mu m waveband laser working module consists of a fundamental frequency light total reflection mirror, a gain medium, a thermal compensation lens, a dichroic mirror, a saturable absorber, a fundamental frequency light half-wave plate, a polarization spectroscope, a second parameter light total reflection mirror, a second nonlinear crystal and a second output mirror; the fundamental frequency light total reflection mirror, the gain medium, the thermal compensation lens, the dichroic mirror, the saturable absorber, the fundamental frequency light half-wave plate, the polarization beam splitter, the second parametric light total reflection mirror, the second nonlinear crystal and the second output mirror are sequentially arranged along the output direction of the light path; wherein the second parametric light total reflection mirror, the second nonlinear crystal and the second output mirror form an 8-12 μm parametric oscillator;
the pump light output by the pump source sequentially passes through the conversion lens and the fundamental frequency light total reflection mirror and then enters the gain medium, the gain medium absorbs the pump light to realize population inversion to generate P-polarized fundamental frequency light, the P-polarized fundamental frequency light enters the dichroic mirror through the thermal compensation lens and then is reflected into the saturable absorber through the dichroic mirror, and the P-polarized fundamental frequency light is modulated by the saturable absorber and then becomes pulse-operated P-polarized fundamental frequency light;
adjusting the direction of an optical axis of a fundamental frequency light half-wave plate to enable the optical axis and the P polarization direction to form an angle of 45 degrees, changing the P polarization fundamental frequency light running through the pulse of the fundamental frequency light half-wave plate into S polarization fundamental frequency light running through the pulse, oscillating the S polarization fundamental frequency light running through the pulse in a cavity of a laser working module with a wave band of 3 mu m-5 mu m, and when the energy density of the fundamental frequency light in the cavity is more than the threshold value of a parametric oscillator with the wave band of 3 mu m-5 mu m, absorbing the fundamental frequency light by a first nonlinear crystal and generating infrared parametric light in the wave band of 3 mu m-5 mu m between the parametric oscillators with the wave band of 3 mu m-5 mu m through parametric conversion;
the optical axis direction of the fundamental frequency light half-wave plate is adjusted to enable the optical axis to be consistent with the P polarization direction, the polarization state of the P polarization fundamental frequency light which runs through the pulse of the fundamental frequency light half-wave plate is not changed, the P polarization fundamental frequency light which runs through the pulse oscillates in the 8-12-micron waveband laser working module cavity, and when the energy density of the fundamental frequency light in the cavity is larger than the threshold value of the 8-12-micron parametric oscillator, the second nonlinear crystal absorbs the fundamental frequency light and generates 8-12-micron waveband mid-infrared parametric light between the 8-12-micron parametric oscillator through parametric conversion.
The inventionHas the advantages that: the invention provides a mid-infrared dual-band laser based on passive Q-switched laser intracavity pumping, wherein lasers with the wavelength of 3-5 microns and lasers with the wavelength of 8-12 microns respectively and independently operate in two parametric oscillator branches, so that the free switching and optimized output of the lasers with the wavelength of 3-5 microns and lasers with the wavelength of 8-12 microns can be realized in one laser, in addition, the tunable output of the laser wavelengths with the two bands can be realized through crystal angle tuning, and the application field of the single mid-infrared laser is further expanded; by doping Cr2+Saturable absorber passive modulation Ho doping3+The gain medium obtains 2 μm fundamental frequency light with high pulse energy/high average power, combines two nonlinear crystals with two wave bands having advantages respectively, and fully utilizes the high energy density of intracavity pumping, thereby effectively reducing the working threshold of the laser and improving the parametric conversion efficiency. In addition, the intermediate infrared laser sources of the two wave bands share one inner cavity type passive Q-switched pump laser, so that the research and development cost of the intermediate infrared laser can be reduced, and the performance structure of the whole solid laser system is more compact.
Drawings
Fig. 1 is a schematic structural diagram of a passively Q-switched laser intracavity pumping type mid-infrared dual-band laser of the present invention.
Detailed Description
The first embodiment is as follows: with reference to fig. 1, a passive Q-switched laser intracavity pumping type mid-infrared dual-band laser according to this embodiment includes a pumping source 1, a conversion lens 2, a fundamental frequency light total reflection mirror 3, a gain medium 4, a thermal compensation lens 5, a dichroic mirror 6, a saturable absorber 7, a fundamental frequency light half-wave plate 8, a polarization beam splitter 9, a first parametric light total reflection mirror 10, a first nonlinear crystal 11, a first output mirror 12, a second parametric light total reflection mirror 13, a second nonlinear crystal 14, and a second output mirror 15;
the 3-5 mu m waveband laser working module consists of a fundamental frequency light total reflection mirror 3, a gain medium 4, a thermal compensation lens 5, a dichroic mirror 6, a saturable absorber 7, a fundamental frequency light half-wave plate 8, a polarization spectroscope 9, a first parameter light total reflection mirror 10, a first nonlinear crystal 11 and a first output mirror 12; and the fundamental frequency light total reflection mirror 3, the gain medium 4, the thermal compensation lens 5, the dichroic mirror 6, the saturable absorber 7, the fundamental frequency light half-wave plate 8, the polarization beam splitter 9, the first parameter light total reflection mirror 10, the first nonlinear crystal 11 and the first output mirror 12 are arranged in sequence along the output direction of the light path; wherein the first parametric optical total reflection mirror 10, the first nonlinear crystal 11 and the first output mirror 12 form a 3-5 μm parametric oscillator;
the 8-12 mu m waveband laser working module consists of a fundamental frequency light total reflection mirror 3, a gain medium 4, a thermal compensation lens 5, a dichroic mirror 6, a saturable absorber 7, a fundamental frequency light half-wave plate 8, a polarization spectroscope 9, a second parameter light total reflection mirror 13, a second nonlinear crystal 14 and a second output mirror 15; and the fundamental frequency light total reflection mirror 3, the gain medium 4, the thermal compensation lens 5, the dichroic mirror 6, the saturable absorber 7, the fundamental frequency light half-wave plate 8, the polarization beam splitter 9, the second parameter light total reflection mirror 13, the second nonlinear crystal 14 and the second output mirror 15 are arranged in sequence along the output direction of the light path; wherein the second parametric optical total reflection mirror 13, the second nonlinear crystal 14 and the second output mirror 15 form an 8-12 μm parametric oscillator;
the pumping light output by the pumping source 1 sequentially passes through the conversion lens 2 and the fundamental frequency light total reflection mirror 3 and then enters the gain medium 4, the gain medium 4 absorbs the pumping light to realize population inversion to generate P-polarized fundamental frequency light, the P-polarized fundamental frequency light penetrates through the thermal compensation lens 5 and enters the dichroic mirror 6, then is reflected into the saturable absorber 7 through the dichroic mirror 6 and is modulated by the saturable absorber 7 to become pulse-operated P-polarized fundamental frequency light;
adjusting the direction of an optical axis of a fundamental frequency light half-wave plate 8 to enable the optical axis and the P polarization direction to form an angle of 45 degrees, changing P polarization fundamental frequency light running through the pulse of the fundamental frequency light half-wave plate 8 into S polarization fundamental frequency light running through the pulse, oscillating the S polarization fundamental frequency light running through the pulse in a cavity of a laser working module with a wave band of 3-5 microns, and when the energy density of the fundamental frequency light in the cavity is larger than the threshold value of a parametric oscillator with the wave band of 3-5 microns, absorbing the fundamental frequency light by a first nonlinear crystal 11 and generating infrared parametric light in the wave band of 3-5 microns between the parametric oscillators with the wave bands of 3-5 microns through parametric conversion;
the direction of an optical axis of the fundamental frequency light half-wave plate 8 is adjusted to enable the optical axis to be consistent with the P polarization direction, the polarization state of the P polarization fundamental frequency light which runs through the pulse of the fundamental frequency light half-wave plate 8 is not changed, the P polarization fundamental frequency light which runs through the pulse oscillates in the 8-12-micron waveband laser working module, and when the energy density of the fundamental frequency light in the cavity is larger than the threshold value of the 8-12-micron parametric oscillator, the second nonlinear crystal 14 absorbs the fundamental frequency light and generates 8-12-micron waveband mid-infrared parametric light between the 8-12-micron parametric oscillator through parametric conversion.
The fundamental frequency light total reflection mirror 3, the gain medium 4, the thermal compensation lens 5, the dichroic mirror 6, the saturable absorber 7, the fundamental frequency light half-wave plate 8, the polarization beam splitter 9 and the first output mirror 12 form a fundamental frequency light working module which is used for obtaining S polarization fundamental frequency light required by parameter conversion;
the fundamental frequency light total reflection mirror 3, the gain medium 4, the thermal compensation lens 5, the dichroic mirror 6, the saturable absorber 7, the fundamental frequency light half-wave plate 8, the polarization beam splitter 9 and the second output mirror 15 form a fundamental frequency light working module which is used for obtaining P polarization fundamental frequency light required by parameter conversion;
the thermal compensation lens 5 can be used for keeping the resonant cavity stable on one hand and adjusting the distribution of the fundamental frequency light oscillation spot size in the resonant cavity on the other hand.
The dichroic mirror 6 is used to filter out the unabsorbed residual pump light.
The saturable absorber 7 is prepared by adjusting the doping Ho3+The inverse population of the gain medium to obtain pulsed fundamental light.
The mid-infrared band nonlinear crystal mainly comprises phosphide, sulfide and selenide. Phosphide has a large nonlinear coefficient, high conversion efficiency can be obtained, but the upper limit of practical infrared wavelength is about 8.5 μm; the practical upper limit of infrared wavelength of sulfide is about 8.5 μm, and the light transmission range of selenide can cover the whole 8-12 μm wave band, so that the defect of phosphide can be effectively compensated. Therefore, the phosphide crystal and the selenide crystal are simultaneously adopted as frequency conversion devices in the optical parametric oscillator and are respectively used for generating laser with wave bands of 3-5 microns and 8-12 microns, and the method is an effective way for realizing the output of the mid-infrared dual-band laser by a single laser. In addition, the passive Q-switching realizes pulse modulation by means of nonlinear absorption of a saturable absorber, additional energy consumption equipment is not needed, the structure is simple and compact, and the complexity of a mid-infrared dual-band laser system can be greatly reduced by combining an intracavity pumping mode.
The beneficial effects of the embodiment are as follows:
the specific embodiment provides a mid-infrared dual-band laser based on passive Q-switched laser intracavity pumping, wherein lasers with the wavelength of 3-5 microns and lasers with the wavelength of 8-12 microns respectively and independently operate in two parametric oscillator branches, so that free switching and optimized output of the lasers with the wavelength of 3-5 microns and lasers with the wavelength of 8-12 microns can be realized in one laser, tunable output of laser wavelengths with the two bands can be realized through crystal angle tuning, and the application field of the single mid-infrared laser is further expanded; by doping Cr2+Saturable absorber passive modulation Ho doping3+The gain medium obtains 2 μm fundamental frequency light with high pulse energy/high average power, combines two nonlinear crystals with two wave bands having advantages respectively, and fully utilizes the high energy density of intracavity pumping, thereby effectively reducing the working threshold of the laser and improving the parametric conversion efficiency. In addition, the intermediate infrared laser sources of the two wave bands share one inner cavity type passive Q-switched pump laser, so that the research and development cost of the intermediate infrared laser can be reduced, and the whole solid laser system is more compact in structure.
The second embodiment is as follows: the first difference between the present embodiment and the specific embodiment is: the pump source 1 is a Tm-doped pump which runs continuously3+Laser having a wavelength corresponding to a band transition of3F4→3H6. The rest is the same as the first embodiment.
The doped Tm is3+The substrate in the laser is a crystal or an optical fiber.
The third concrete implementation mode: this embodiment is different from the first or second embodiment in that: the transformation lens 2 is a convex lens plated with a pumping light antireflection film; the fundamental frequency light total reflection mirror 3 is a plane mirror with one side plated with a pumping light antireflection film and the other side simultaneously plated with a pumping light antireflection film and a fundamental frequency light high reflection film. The other is the same as in the first or second embodiment.
The fourth concrete implementation mode: this implementationThe mode is different from one of the first to the third embodiments: the gain medium 4 is Ho-doped3+Crystals or doped with Ho3+Transparent ceramics, laser radiation occurring in the energy band5I7→5I8To (c) to (d); and both sides of the gain medium 4 are plated with a pumping light antireflection film and a fundamental frequency light antireflection film. The others are the same as the first to third embodiments.
The fifth concrete implementation mode: the difference between this embodiment and one of the first to fourth embodiments is: the gain medium 4 is Ho YAG transparent ceramic, Ho YAG crystal, Ho YVO4Crystal, Ho: YLF crystal or Ho: YAP crystal. The rest is the same as the first to fourth embodiments.
The sixth specific implementation mode: the difference between this embodiment and one of the first to fifth embodiments is: the thermal compensation lens 5 is a convex lens with both sides plated with a pumping light antireflection film and a fundamental frequency light antireflection film or a concave lens with both sides plated with a pumping light antireflection film and a fundamental frequency light antireflection film; the dichroscope 6 is a plane mirror with one side plated with a pumping light antireflection film and a fundamental frequency light high reflection film at the same time and the other side plated with a pumping light antireflection film. The rest is the same as the first to fifth embodiments.
The seventh embodiment: the difference between this embodiment and one of the first to sixth embodiments is: the normal line of the saturable absorber 7 and the light transmission direction form a Brewster angle and are placed to obtain the P polarization fundamental frequency light with pulse operation; the saturable absorber 7 is Cr2+ZnS crystal, Cr2+ZnS transparent ceramics, Cr2+ZnSe crystals or Cr2+ZnSe transparent ceramics. The others are the same as the first to sixth embodiments.
The specific implementation mode is eight: the present embodiment differs from one of the first to seventh embodiments in that: the fundamental frequency light half-wave plate 8 is a polarizing device made of a single-axis crystal, and the light passing direction is vertical to the optical axis. The rest is the same as the first to seventh embodiments.
The specific implementation method nine: the present embodiment differs from the first to eighth embodiments in that: the polarization spectroscope 9 is a plane mirror with one side simultaneously plated with a P-polarization fundamental frequency light antireflection film and an S-polarization fundamental frequency light high reflection film and the other side plated with a P-polarization fundamental frequency light antireflection film; the first parametric light total reflection mirror 10 is a plane mirror with one side plated with an S-polarized fundamental frequency light antireflection film and the other side simultaneously plated with an S-polarized fundamental frequency light antireflection film and a 3-5 μm high reflection film; the first output mirror 12 is a plane mirror with one side coated with an S-polarized fundamental frequency light high reflection film and an anti-reflection film of 3-5 μm, and the other side coated with a partial reflection film of 3-5 μm; the second parametric light total reflection mirror 13 is a plane mirror with one side plated with a P-polarization fundamental frequency light antireflection film and the other side simultaneously plated with the P-polarization fundamental frequency light antireflection film and a high reflection film of 2.45-2.85 μm; the second output mirror 15 is a plane mirror with one side coated with a P-polarized fundamental frequency light high reflection film and an anti-reflection film of 2.45-2.85 μm, and the other side coated with a partial reflection film of 2.45-2.85 μm. The other points are the same as those in the first to eighth embodiments.
The 2.45-2.85 μm is the wavelength of the signal light; the idler frequency wavelength range correspondingly output by the second output mirror 15 covers 8-12 μm.
The detailed implementation mode is ten: the present embodiment differs from one of the first to ninth embodiments in that: the first nonlinear crystal 11 is ZnGeP2A crystal; the second nonlinear crystal 14 is CdSe crystal or BaGa crystal4Se7And (4) crystals. The other points are the same as those in the first to ninth embodiments.
The gain medium 4, the saturable absorber 7, the first nonlinear crystal 11 and the second nonlinear crystal 14 can be selected from the Ho-doped crystals3+Gain medium and the above Cr-doped2+Crystal/transparent ceramic and any combination of the above first/second nonlinear crystals to achieve freely switchable output of 3-5 μm and 8-12 μm band lasers.
The following examples were used to demonstrate the beneficial effects of the present invention:
the first embodiment is as follows:
a passive Q-switched laser intracavity pumping type mid-infrared dual-band laser comprises a pumping source 1, a conversion lens 2, a fundamental frequency light total reflection mirror 3, a gain medium 4, a thermal compensation lens 5, a dichroic mirror 6, a saturable absorber 7, a fundamental frequency light half-wave plate 8, a polarization spectroscope 9, a first parameter light total reflection mirror 10, a first nonlinear crystal 11, a first output mirror 12, a second parameter light total reflection mirror 13, a second nonlinear crystal 14 and a second output mirror 15;
the 3-5 mu m waveband laser working module consists of a fundamental frequency light total reflection mirror 3, a gain medium 4, a thermal compensation lens 5, a dichroic mirror 6, a saturable absorber 7, a fundamental frequency light half-wave plate 8, a polarization spectroscope 9, a first parameter light total reflection mirror 10, a first nonlinear crystal 11 and a first output mirror 12; and the fundamental frequency light total reflection mirror 3, the gain medium 4, the thermal compensation lens 5, the dichroic mirror 6, the saturable absorber 7, the fundamental frequency light half-wave plate 8, the polarization beam splitter 9, the first parameter light total reflection mirror 10, the first nonlinear crystal 11 and the first output mirror 12 are arranged in sequence along the output direction of the light path; wherein the first parametric optical total reflection mirror 10, the first nonlinear crystal 11 and the first output mirror 12 form a 3-5 μm parametric oscillator;
the 8-12 mu m waveband laser working module consists of a fundamental frequency light total reflection mirror 3, a gain medium 4, a thermal compensation lens 5, a dichroic mirror 6, a saturable absorber 7, a fundamental frequency light half-wave plate 8, a polarization spectroscope 9, a second parameter light total reflection mirror 13, a second nonlinear crystal 14 and a second output mirror 15; and the fundamental frequency light total reflection mirror 3, the gain medium 4, the thermal compensation lens 5, the dichroic mirror 6, the saturable absorber 7, the fundamental frequency light half-wave plate 8, the polarization beam splitter 9, the second parameter light total reflection mirror 13, the second nonlinear crystal 14 and the second output mirror 15 are arranged in sequence along the output direction of the light path; wherein the second parametric optical total reflection mirror 13, the second nonlinear crystal 14 and the second output mirror 15 form an 8-12 μm parametric oscillator;
the pumping light output by the pumping source 1 sequentially passes through the conversion lens 2 and the fundamental frequency light total reflection mirror 3 and then enters the gain medium 4, the gain medium 4 absorbs the pumping light to realize population inversion to generate P-polarized fundamental frequency light, the P-polarized fundamental frequency light penetrates through the thermal compensation lens 5 and enters the dichroic mirror 6, then is reflected into the saturable absorber 7 through the dichroic mirror 6 and is modulated by the saturable absorber 7 to become pulse-operated P-polarized fundamental frequency light;
adjusting the direction of an optical axis of a fundamental frequency light half-wave plate 8 to enable the optical axis and the P polarization direction to form an angle of 45 degrees, changing P polarization fundamental frequency light running through the pulse of the fundamental frequency light half-wave plate 8 into S polarization fundamental frequency light running through the pulse, oscillating the S polarization fundamental frequency light running through the pulse in a cavity of a laser working module with a wave band of 3-5 microns, and when the energy density of the fundamental frequency light in the cavity is larger than the threshold value of a parametric oscillator with the wave band of 3-5 microns, absorbing the fundamental frequency light by a first nonlinear crystal 11 and generating infrared parametric light in the wave band of 3-5 microns between the parametric oscillators with the wave bands of 3-5 microns through parametric conversion;
adjusting the direction of an optical axis of the fundamental frequency light half-wave plate 8 to enable the optical axis to be consistent with the P polarization direction, enabling the polarization state of the P polarization fundamental frequency light running through the pulse of the fundamental frequency light half-wave plate 8 not to be changed, enabling the P polarization fundamental frequency light running through the pulse to oscillate in a laser working module cavity with a wave band of 8-12 microns, and enabling the second nonlinear crystal 14 to absorb the fundamental frequency light and generate infrared parametric light in the wave band of 8-12 microns between the parametric oscillators with the wave bands of 8-12 microns through parametric conversion when the energy density of the fundamental frequency light in the cavity is larger than the threshold value of the parametric oscillators with the wave bands of 8-12 microns;
the pumping source 1 is a Tm: YLF solid laser with the wavelength of 1908 nm;
the transformation lens 2 is a convex lens plated with a pumping light antireflection film; the fundamental frequency light total reflection mirror 3 is a plane mirror with one side plated with a pumping light antireflection film and the other side simultaneously plated with a pumping light antireflection film and a fundamental frequency light high reflection film;
the gain medium 4 is Ho: YAG transparent ceramic, and laser radiation is generated in an energy band5I7→5I8To (c) to (d); both sides of the gain medium 4 are plated with a pumping light antireflection film and a fundamental frequency light antireflection film;
the thermal compensation lens 5 is used for keeping the resonant cavity stable and adjusting the spot radius of the fundamental frequency light in the gain medium 4, the first nonlinear crystal 11 and the second nonlinear crystal 14; the radius of a pumping light spot in the gain medium 4 is 0.45mm, the focal length of the thermal compensation lens 5 is 1000mm to an infinite convex lens, the radius of the light spot corresponding to fundamental frequency light in the gain medium 4 is 0.47mm to 0.41mm, and the radius of the light spot corresponding to fundamental frequency light in the first nonlinear crystal 11 and the second nonlinear crystal 14 is 0.25mm to 0.21 mm;
the thermal compensation lens 5 is a convex lens with both sides plated with a pumping light antireflection film and a fundamental frequency light antireflection film; the dichroscope 6 is a plane mirror with one side plated with a pumping light antireflection film and a fundamental frequency light high reflection film at the same time and the other side plated with a pumping light antireflection film;
the normal line of the saturable absorber 7 and the light transmission direction form a Brewster angle and are placed to obtain the P polarization fundamental frequency light with pulse operation; the saturable absorber 7 is Cr2+ZnS transparent ceramic, producing pulsed P-polarized fundamental frequency light with an output wavelength of 2.09 μm and Cr2+The small signal transmittance of ZnS transparent ceramic to P-polarized fundamental frequency light operated with a pulse having a wavelength of 2.09 μm is 80%;
the fundamental frequency light half-wave plate 8 is a polarizing device made of uniaxial crystals, and the light transmission direction is vertical to the optical axis;
the polarization spectroscope 9 is a plane mirror with one side simultaneously plated with a P-polarization fundamental frequency light antireflection film and an S-polarization fundamental frequency light high reflection film and the other side plated with a P-polarization fundamental frequency light antireflection film; the first parametric light total reflection mirror 10 is a plane mirror with one side plated with an S-polarized fundamental frequency light antireflection film and the other side simultaneously plated with an S-polarized fundamental frequency light antireflection film and a 3-5 μm high reflection film; the first output mirror 12 is a plane mirror with one side coated with an S-polarized fundamental frequency light high reflection film and an anti-reflection film of 3-5 μm, and the other side coated with a reflection film of 3-5 μm with a light transmittance of 70%; therefore, the first parametric optical total reflection mirror 10, the first nonlinear crystal 11 and the first output mirror 12 form a double-resonance optical parametric oscillator;
the second parametric light total reflection mirror 13 is a plane mirror with one side plated with a P-polarization fundamental frequency light antireflection film and the other side simultaneously plated with the P-polarization fundamental frequency light antireflection film and a high reflection film of 2.45-2.85 μm; the second output mirror 15 is a plane mirror with one side coated with a P-polarization fundamental frequency light high reflection film and an antireflection film of 2.45-2.85 μm and the other side coated with a reflection film of 2.45-2.85 μm with a light transmittance of 20%, so that the second parametric light total reflection mirror 13, the second nonlinear crystal 14 and the second output mirror 15 form a signal light single-resonance optical parametric oscillator;
the first nonlinear crystal 11 is ZnGeP2A crystal; the second nonlinear crystal 14 is a CdSe crystal.
By adjusting the incident power, the phase matching angle and the optical axis direction of the fundamental frequency light half-wave plate, the mid-infrared dual-band laser provided by the embodiment can realize free switching and wavelength continuous tuning output of the dual-band laser with the repetition frequency of 2 kHz-10 kHz and the watt level of 3.5μm-5.2 μm and the hundred milliwatt level of 10 μm-11 μm.
Example two: the difference between the present embodiment and the first embodiment is: the gain medium 4 is a Ho YAG crystal; the saturable absorber 7 is Cr2+ZnS crystal. The rest is the same as the first embodiment.
Example three: the difference between the present embodiment and the first embodiment is: the saturable absorber 7 is Cr2+ZnSe crystals or Cr2+ZnSe transparent ceramics. The rest is the same as the first embodiment.
Example four: the difference between the present embodiment and the first embodiment is: the second nonlinear crystal 14 is BaGa4Se7And (4) crystals. The rest is the same as the first embodiment.
Example five: the difference between the present embodiment and the first embodiment is: the first output mirror 12 is a flat mirror with one side simultaneously coated with an S-polarization fundamental light high reflection film and an anti-reflection film of 3-5 μm, and the other side simultaneously coated with a signal light anti-reflection film and an idler frequency light partial reflection film, so that the first parametric light total reflection mirror 10, the first nonlinear crystal 11 and the first output mirror 12 constitute an idler frequency light single-resonant optical parametric oscillator. The rest is the same as the first embodiment.
Example six: the difference between the present embodiment and the first embodiment is: the first output mirror 12 is a flat mirror with one side simultaneously coated with an S-polarization fundamental frequency light high reflection film and an anti-reflection film of 3 μm to 5 μm and the other side simultaneously coated with an idler frequency light anti-reflection film and a signal light partial reflection film, so that the first parametric light total reflection mirror 10, the first nonlinear crystal 11 and the first output mirror 12 constitute a signal light single-resonant optical parametric oscillator. The rest is the same as the first embodiment.
Claims (10)
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115548855A (en) * | 2022-09-22 | 2022-12-30 | 中国人民解放军国防科技大学 | Method and device for generating dual-band mid- and far-infrared lasers based on barium selenium gallium crystals |
| CN119154081A (en) * | 2024-11-19 | 2024-12-17 | 北京杏林睿光科技有限公司 | Multi-wavelength visible light laser based on single gain medium and polarization separate control |
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2021
- 2021-07-02 CN CN202110752692.5A patent/CN113471796A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115548855A (en) * | 2022-09-22 | 2022-12-30 | 中国人民解放军国防科技大学 | Method and device for generating dual-band mid- and far-infrared lasers based on barium selenium gallium crystals |
| CN115548855B (en) * | 2022-09-22 | 2023-10-20 | 中国人民解放军国防科技大学 | Method and device for generating dual-band mid- and far-infrared laser based on gallium selenium and barium crystals |
| CN119154081A (en) * | 2024-11-19 | 2024-12-17 | 北京杏林睿光科技有限公司 | Multi-wavelength visible light laser based on single gain medium and polarization separate control |
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