CN111509548A - Narrow-linewidth intermediate infrared laser with tunable wavelength - Google Patents
Narrow-linewidth intermediate infrared laser with tunable wavelength Download PDFInfo
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- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
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- 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
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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
- H01S3/10007—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers
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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
- H01S3/102—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling the active medium, e.g. by controlling the processes or apparatus for excitation
- H01S3/1026—Controlling the active medium by translation or rotation, e.g. to remove heat from that part of the active medium that is situated on the resonator axis
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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
- H01S3/102—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling the active medium, e.g. by controlling the processes or apparatus for excitation
- H01S3/1028—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling the active medium, e.g. by controlling the processes or apparatus for excitation by controlling the temperature
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Abstract
The invention relates to a narrow-linewidth intermediate infrared laser with tunable wavelength, belonging to the technical field of photoelectrons and comprising a polarization-maintaining optical fiber seed source, a seed laser output optical fiber, a polarization-maintaining optical fiber amplifier, an amplifier output optical fiber, an output collimator, a spatial isolator, a polarization controller, an optical parametric oscillator and a control system, wherein the polarization-maintaining optical fiber seed source, the seed laser output optical fiber, the polarization-maintaining optical fiber amplifier, the amplifier output optical fiber and the output collimator are sequentially connected, the optical parametric oscillator is placed in alignment with the output end of the output collimator, and the spatial isolator and the polarization controller are placed between the output collimator and the optical parametric oscillator.
Description
Technical Field
The invention belongs to the technical field of photoelectrons, and relates to a narrow-linewidth mid-infrared laser with tunable wavelength.
Background
The wide-range wavelength tuning narrow-linewidth intermediate infrared laser has wide and important application in civil fields such as laser medical treatment, special material processing, infrared remote sensing and equipment and instruments of precise spectral analysis; in the military application field, the wide-range wavelength tuning narrow-linewidth mid-infrared laser can be applied to a wind measurement laser radar, provides high-precision environmental wind field data for carrier-based fighters, fighters and various missiles, reduces the take-off and landing risks of airplanes, improves the hit precision of the missiles, can also be used for chemical weapon early warning and the like, and therefore, the high-power tunable laser has important significance in various instruments and equipment in both the civil field and the military field.
In the research of tunable intermediate infrared lasers, an Optical Parametric Oscillator (OPO) based on a PP L N crystal is one of the important points of the research, a Periodically Poled L th-ium niobe (PP L N) crystal gradually becomes a hotspot of the research at home and abroad due to the advantages of large nonlinear coefficient, wide light transmission range, various wavelength tuning modes and the like, and is applied to various fields such as laser radar, gas detection, molecular atom detection, scientific research and analysis and developed to the wider application field.
In the currently reported tunable mid-infrared laser based on PP L N, a temperature control mode is generally adopted to realize wavelength automatic tuning, the tuning mode has a narrow wavelength adjustable range and a slow adjusting speed, a mode of changing a polarization period is also adopted to carry out tuning, but a manual mode is generally adopted to not realize automatic tuning, and a solid laser pump with a non-tunable wavelength is generally adopted in the tunable mid-infrared laser based on PP L N, so that the starting of fine wavelength scanning cannot be realized.
Disclosure of Invention
The invention solves the technical problem of overcoming the defects of the prior art and provides a narrow-linewidth intermediate infrared laser with tunable wavelength, which realizes the wide-range rapid fine adjustment of laser output in an intermediate infrared band, realizes the wide-range rapid fine tuning of the wavelength by establishing the corresponding relation between PP L N position adjustment and temperature adjustment and the output wavelength and by a table look-up method.
The technical scheme of the invention is as follows:
a narrow linewidth intermediate infrared laser with tunable wavelength comprises a polarization maintaining optical fiber seed source, a seed laser output optical fiber, a polarization maintaining optical fiber amplifier, an amplifier output optical fiber, an output collimator, a space isolator, a polarization controller, an optical parametric oscillator and a control system; wherein, the optical axis of the polarization maintaining fiber seed source is horizontally arranged; one end of the seed laser output optical fiber is connected with the output end of the polarization maintaining optical fiber seed source; the other end of the seed laser output optical fiber is connected with the input end of the polarization-maintaining optical fiber amplifier; one end of the amplifier output optical fiber is connected with the output end of the polarization-maintaining optical fiber amplifier; the other end of the amplifier output optical fiber is connected with the input end of the output collimator; the optical parametric oscillator is aligned with the output end of the output collimator and is placed; the spatial isolator and the polarization controller are arranged between the output collimator and the optical parametric oscillator; the spatial isolator is close to the output collimator; the polarization controller is close to the optical parametric oscillator; the polarization maintaining optical fiber seed source, the seed laser output optical fiber, the polarization maintaining optical fiber amplifier, the amplifier output optical fiber, the output collimator, the space isolator, the polarization controller and the optical parametric oscillator are coaxially arranged; the control system is respectively and electrically connected with the polarization maintaining optical fiber seed source, the polarization maintaining optical fiber amplifier and the optical parametric oscillator.
In the above wavelength tunable narrow linewidth mid-infrared laser, the working process of the laser is as follows:
the control system controls the polarization maintaining fiber seed source to emit a light source, and the light source enters the polarization maintaining fiber amplifier through the seed laser output fiber; the control system controls the polarization maintaining optical fiber amplifier to amplify the power of the light source; the light source after power amplification enters an output collimator through an amplifier output optical fiber; the output collimator adjusts the optical axis of the light source to be aligned with the space isolator, the polarization controller and the optical parametric oscillator; the quasi-space isolator performs one-way transmission processing on the light source output by the output collimator; outputting the light source to the polarization controller only along the optical axis direction; the polarization controller changes the polarization direction of the light source and outputs the light source to the optical parametric oscillator; the optical parametric oscillator tunes the wavelength of the light source and outputs the tuned wavelength.
In the narrow-linewidth intermediate infrared laser with tunable wavelength, the polarization maintaining fiber seed source is a Yb-doped or Er-doped or thulium-doped fiber laser, and the linewidth is less than 0.1 GHz; the wavelength tuning range of a light source emitted by the polarization maintaining optical fiber seed source is set through a control system, and the wavelength tuning range is larger than 0.01 nm.
In the narrow-linewidth mid-infrared laser with tunable wavelength, the seed laser output fiber is a single-mode polarization maintaining fiber, and the output is linearly polarized laser.
In the narrow-linewidth mid-infrared laser with tunable wavelength, the output power of the polarization maintaining optical fiber amplifier is adjusted through the control system; the maximum output power is more than 5W; the output optical fiber of the amplifier is a polarization maintaining optical fiber; the output is linearly polarized light.
In the above wavelength tunable narrow linewidth mid-infrared laser, the spatial light transmission size of the spatial isolator is larger than the input light source spot size; the isolation is greater than 20dB, and the effect of reflected light is prevented.
The optical parametric oscillator comprises a first reflecting mirror, a second reflecting mirror, a focusing lens, a first planoconcave mirror, a PP L N crystal module, a second planoconcave mirror, a third reflecting mirror, a fourth reflecting mirror and an interference filter, wherein the first reflecting mirror is arranged at the incident position of a light source after a polarization controller changes the polarization direction, the horizontal light source is reflected to the vertical downward direction, the second reflecting mirror is arranged below the first reflecting mirror to reflect the vertical light source to the horizontal direction, the focusing lens, the first planoconcave mirror, the PP L N crystal module and the second planoconcave mirror are sequentially and horizontally arranged on one side of the second reflecting mirror and positioned in the emitting direction of the light source reflected by the second reflecting mirror, the third reflecting mirror is arranged above the first planoconcave mirror, the fourth reflecting mirror is arranged above the second planoconcave mirror, the interference filter is arranged between the third reflecting mirror and the fourth reflecting mirror, and the interference filter is used for narrowing the line width of an output light source.
In the narrow linewidth intermediate infrared laser with tunable wavelength, the first plano-concave mirror, the second plano-concave mirror, the third reflector and the fourth reflector form a square ring cavity; the concave surfaces of the first flat concave mirror and the second flat concave mirror are placed inwards; and the circular refraction of the optical fiber in the square ring cavity is realized.
In the narrow-linewidth mid-infrared laser with tunable wavelength, the focusing lens adjusts a convergence point of a light source reflected by the second reflector; the light source after the convergent point is adjusted enters the square ring cavity from the first flat concave cavity mirror; the light source performs the circulating reflection of a second flat concave cavity mirror, a third reflector, a fourth reflector, a first plano-concave mirror and a second plano-concave mirror; the light source circularly reflects for n times in the square ring cavity until the gain of the light source in the square ring cavity is larger than the loss of the light source in the square ring cavity, the circulation is stopped, and the light source is reflected by the first plano-concave cavity mirror and then is emitted by the second plano-concave cavity mirror; n is a positive integer, and n is greater than or equal to 1.
In the wavelength tunable narrow linewidth mid-infrared laser, the planes of the first plano-concave mirror and the second plano-concave mirror are totally transparent to the incident light source; the reflectivity of the concave surface to the light source is more than 90%.
In the narrow-linewidth intermediate infrared laser with tunable wavelength, the PP L N crystal module comprises a PP L N crystal, a temperature control module, a guide rail sliding block and an electric guide rail, wherein the electric guide rail is vertically arranged in the axial direction, the guide rail sliding block is sleeved on the electric guide rail, the temperature control module is fixedly arranged on the guide rail sliding block, the PP L N crystal is fixedly arranged in the temperature control module, the guide rail sliding block is driven by an external driving mechanism to drive the PP L N crystal and the temperature control module to move in a translation mode along the electric guide rail, and the wavelength of a light source is tuned by changing the position of the light source injected into the PP L N crystal.
The narrow-linewidth intermediate infrared laser with the tunable wavelength comprises a refrigeration module, a heating module, a crystal fixing pressing plate and a crystal protection cover, wherein the crystal protection cover is a hollow cover body, the crystal protection cover covers the upper surface of a guide rail sliding block, the refrigeration module, the heating module, a PP L N crystal and the crystal fixing pressing plate are all arranged inside the crystal protection cover, the refrigeration module is fixedly arranged on the upper surface of the guide rail sliding block, the heating module is fixedly arranged on the upper surface of the refrigeration module, the PP L N crystal is arranged at the top of the heating module, the crystal fixing pressing plate is arranged at the top of the heating module, and the PP L N crystal is pressed and fixed through the crystal fixing pressing plate.
In the narrow-linewidth intermediate infrared laser with tunable wavelength, the temperature of the PP L N crystal is adjusted by adjusting the refrigeration module and the heating module through the control system, and the wavelength of a light source which is injected into the PP L N crystal is tuned by adjusting the temperature of the PP L N crystal.
Compared with the prior art, the invention has the beneficial effects that:
(1) the invention realizes the output of a high-power tunable fiber laser by adopting a tunable fiber laser seed source and a fiber amplifier module, controls the temperature of a PP L N crystal in an Optical Parametric Oscillator (OPO) module, and changes the polarization period of PP L N in a light path by controlling the position of the crystal in the light path, thereby realizing the rapid large-range tuning of the laser in a middle infrared band;
(2) the invention realizes the large-scale rapid fine adjustment of laser output in the middle infrared band by combining the tunable narrow-linewidth fiber laser seed source and the Optical Parametric Oscillator (OPO) tuning method;
(3) according to the invention, the narrow-linewidth intermediate infrared laser output with wide-range and rapid fine tuning wavelength is realized by establishing the corresponding relation between the PP L N position adjustment and the temperature adjustment and the output wavelength.
Drawings
FIG. 1 is a schematic view of a narrow linewidth mid-IR laser according to the present invention;
FIG. 2 is a schematic diagram of an optical parametric oscillator according to the present invention;
FIG. 3 is a schematic diagram of a PP L N crystal module of the present invention;
FIG. 4 is a schematic view of a temperature control module according to the present invention.
Detailed Description
The invention is further illustrated by the following examples.
The invention provides a narrow-linewidth intermediate infrared laser with tunable wavelength and a wavelength tuning method, which realize the output of a high-power tunable fiber laser by adopting a tunable fiber laser seed source and a fiber amplifier module, simultaneously control the temperature of a PP L N crystal 851 in an optical parameter oscillator 8(OPO) module, change the polarization period of a PP L N in an optical path by controlling the position of the PP L N crystal 851 in the optical path, realize the rapid wide-range tuning of the laser in a middle infrared band, realize the rapid wide-range fine adjustment of the laser output in the middle infrared band by combining the tunable narrow-linewidth fiber laser seed source and the Optical Parameter Oscillator (OPO) tuning method, establish the corresponding relation between the PP L N position adjustment and the temperature adjustment and the output wavelength, and realize the rapid wide-range fine tuning of the wavelength of the narrow-linewidth intermediate infrared laser by a table look-up method.
As shown in fig. 1, the narrow linewidth mid-infrared laser specifically includes a polarization maintaining fiber seed source 1, a seed laser output fiber 2, a polarization maintaining fiber amplifier 3, an amplifier output fiber 4, an output collimator 5, a spatial isolator 6, a polarization controller 7, an optical parametric oscillator 8 and a control system 9; wherein, the optical axis of the polarization maintaining fiber seed source 1 is horizontally arranged; one end of a seed laser output optical fiber 2 is connected with the output end of a polarization maintaining optical fiber seed source 1; the other end of the seed laser output optical fiber 2 is connected with the input end of a polarization maintaining optical fiber amplifier 3; one end of the amplifier output optical fiber 4 is connected with the output end of the polarization-maintaining optical fiber amplifier 3; the other end of the amplifier output optical fiber 4 is connected with the input end of an output collimator 5; the optical parametric oscillator 8 is placed in alignment with the output end of the output collimator 5; the spatial isolator 6 and the polarization controller 7 are placed between the output collimator 5 and the optical parametric oscillator 8; the spatial isolator 6 is close to the output collimator 5; the polarization controller 7 is close to the optical parametric oscillator 8; the optical axis of a polarization maintaining optical fiber seed source 1, a seed laser output optical fiber 2, a polarization maintaining optical fiber amplifier 3, an amplifier output optical fiber 4, an output collimator 5, a spatial isolator 6, a polarization controller 7 and an optical parametric oscillator 8 are coaxially arranged; the control system 9 is respectively electrically connected with the polarization maintaining fiber seed source 1, the polarization maintaining fiber amplifier 3 and the optical parametric oscillator 8.
The working process of the laser is as follows:
the control system 9 controls the polarization maintaining optical fiber seed source 1 to emit a light source, and the light source enters the polarization maintaining optical fiber amplifier 3 through the seed laser output optical fiber 2; the control system 9 controls the polarization maintaining optical fiber amplifier 3 to amplify the power of the light source; the light source after power amplification enters an output collimator 5 through an amplifier output optical fiber 4; the output collimator 5 adjusts the optical axis of the light source to be aligned with the space isolator 6, the polarization controller 7 and the optical parametric oscillator 8; the quasi-space isolator 6 carries out one-way transmission processing on the light source output by the output collimator 5; outputting the light source to the polarization controller 7 only in the optical axis direction; the polarization controller 7 changes the polarization direction of the light source and outputs the light source to the optical parametric oscillator 8; the optical parametric oscillator 8 tunes the wavelength of the light source and outputs the tuned wavelength. The polarization maintaining fiber seed source 1 is a Yb-doped or Er-doped or thulium-doped fiber laser, and the line width is less than 0.1 GHz; the wavelength tuning range of the light source emitted by the polarization maintaining optical fiber seed source 1 is set through the control system 9, and the wavelength tuning range is larger than 0.01 nm. The seed laser output fiber 2 is a single-mode polarization maintaining fiber, and outputs linearly polarized laser. The output power of the polarization maintaining optical fiber amplifier 3 is adjusted through a control system 9; the maximum output power is more than 5W; the amplifier output fiber 4 is a polarization maintaining fiber; outputting linearly polarized light; beam mass M2The collimation output working distance is larger than 10cm and the output line width is smaller than 1GHz, the output power can be set through the control system 9, and the maximum output power is larger than 5W; . The space light transmission size of the space isolator 6 is larger than the light spot size of the input light source; the isolation is greater than 20dB, and the effect of reflected light is prevented. The polarization controller 7 can change the polarization direction of the linearly polarized laser and optimize the conversion efficiency of the subsequent nonlinear frequency conversion.
The optical parametric oscillator 8 comprises a first reflector 81, a second reflector 82, a focusing lens 83, a first planar re-entrant mirror 84, a PP L N crystal module 85, a second planar re-entrant mirror 86, a third reflector 87, a fourth reflector 88 and an interference filter 89, as shown in FIG. 2, wherein the first reflector 81 is arranged in a polarization controller 7 to change the incidence position of the light source after polarization, the horizontal light source is reflected to the vertically downward direction, the second reflector 82 is arranged below the first reflector 81 to reflect the vertical light source to the horizontal direction, the focusing lens 83, the first planar re-entrant mirror 84, the PP L N crystal module 85 and the second planar re-entrant mirror 86 are arranged horizontally on one side of the second reflector 82 in sequence and in the direction of light source reflection by the second reflector 82, the planes of the first planar re-entrant mirror 84 and the second planar re-entrant mirror 86 are fully transparent to the incident light source, the reflectivity of the light source is greater than 90%, the third reflector 87 is arranged above the first planar re-entrant mirror 84, the fourth reflector 88 is arranged above the second planar re-entrant mirror 86, the reflective ring-entrant mirror 86 is arranged above the reflective reflector 86, the reflective reflector is arranged above the reflective ring-reflective reflector 86, the reflective reflector is arranged in a ring-reflective filter 86, the reflective ring-reflective mirror 86 is arranged between the second reflector 84, the reflective ring-reflective.
As shown in FIG. 3, a PP L N crystal module 85 comprises a PP L N crystal 851, a temperature control module 852, a guide rail slider 853 and an electric guide rail 854, wherein the electric guide rail 854 is axially and vertically arranged, the guide rail slider 853 is sleeved on the electric guide rail 854, the temperature control module 852 is fixedly arranged on the guide rail slider 853, the PP L N crystal 851 is fixedly arranged in the temperature control module 852, the polarization period of the PP L N crystal 851 is changed along with the position of pump light on the crystal input surface and the crystal output surface, the guide rail slider 853 is driven by an external driving mechanism to drive the PP L N crystal 851 and the temperature control module 852 to do translational motion along the electric guide rail 854, and the tuning of the wavelength of a light source is realized by changing the position of the light source which is emitted into the PP L N crystal 851.
As shown in FIG. 4, temperature control module 852 comprises a refrigeration module 855, a heating module 856, a crystal fixing pressing plate 857 and a crystal protection cover 858, wherein crystal protection cover 858 is a hollow cover body, crystal protection cover 858 covers the upper surface of guide rail slide block 853, refrigeration module 855, heating module 856, PP L N crystal 851 and crystal fixing pressing plate 857 are all arranged inside crystal protection cover 858, refrigeration module 855 is fixedly arranged on the upper surface of guide rail slide block 853, heating module 856 is fixedly arranged on the upper surface of refrigeration module 855, PP L N crystal 851 is arranged on the top of heating module 856, crystal fixing pressing plate 857 is arranged on the top of heating module 856, PP L N crystal 851 is pressed and fixed through crystal fixing pressing plate 857, temperature adjustment of PP L N crystal 851 is realized through adjusting refrigeration module 855 and heating module 856 by control system 9, and tuning of wavelength of incident PP L N crystal 851 is realized through adjusting temperature of PP L N crystal 851.
The high-power tunable fiber laser output is realized by adopting a tunable polarization-maintaining fiber seed source 1 and a polarization-maintaining fiber amplifier 3, the temperature of a PP L N crystal 851 in an optical parameter oscillator 8(OPO) module is controlled by a control system 9, the position of the PP L N crystal 851 in a light path is controlled by the control system 9, the polarization period of the PP L N crystal 851 in the light path is changed, and the laser is quickly tuned in a large range in a middle infrared band.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention, and those skilled in the art can make variations and modifications of the present invention without departing from the spirit and scope of the present invention by using the methods and technical contents disclosed above.
Claims (13)
1. A wavelength tunable narrow linewidth mid-infrared laser, characterized by: the polarization maintaining fiber laser system comprises a polarization maintaining fiber seed source (1), a seed laser output fiber (2), a polarization maintaining fiber amplifier (3), an amplifier output fiber (4), an output collimator (5), a space isolator (6), a polarization controller (7), an optical parametric oscillator (8) and a control system (9); wherein the optical axis of the polarization maintaining fiber seed source (1) is horizontally arranged; one end of the seed laser output optical fiber (2) is connected with the output end of the polarization maintaining optical fiber seed source (1); the other end of the seed laser output optical fiber (2) is connected with the input end of the polarization-maintaining optical fiber amplifier (3); one end of the amplifier output optical fiber (4) is connected with the output end of the polarization-maintaining optical fiber amplifier (3); the other end of the amplifier output optical fiber (4) is connected with the input end of an output collimator (5); the optical parametric oscillator (8) is aligned with the output end of the output collimator (5) and is placed; a spatial isolator (6) and a polarization controller (7) are placed between the output collimator (5) and the optical parametric oscillator (8); the spatial isolator (6) is close to the output collimator (5); the polarization controller (7) is close to the optical parametric oscillator (8); the polarization maintaining optical fiber seed source (1), the seed laser output optical fiber (2), the polarization maintaining optical fiber amplifier (3), the amplifier output optical fiber (4), the output collimator (5), the spatial isolator (6), the polarization controller (7) and the optical parametric oscillator (8) are coaxially arranged; the control system (9) is respectively and electrically connected with the polarization maintaining optical fiber seed source (1), the polarization maintaining optical fiber amplifier (3) and the optical parametric oscillator (8).
2. A wavelength tunable narrow linewidth mid-ir laser as claimed in claim 1, wherein: the working process of the laser is as follows:
the control system (9) controls the polarization maintaining optical fiber seed source (1) to emit a light source, and the light source enters the polarization maintaining optical fiber amplifier (3) through the seed laser output optical fiber (2); the control system (9) controls the polarization maintaining optical fiber amplifier (3) to amplify the power of the light source; the light source after power amplification enters an output collimator (5) through an amplifier output optical fiber (4); the output collimator (5) adjusts the optical axis of the light source to be aligned with the space isolator (6), the polarization controller (7) and the optical parametric oscillator (8); the quasi-space isolator (6) carries out one-way transmission processing on the light source output by the output collimator (5); outputting the light source to a polarization controller (7) only in the optical axis direction; the polarization controller (7) changes the polarization direction of the light source and outputs the light source to the optical parametric oscillator (8); the optical parametric oscillator (8) tunes the wavelength of the light source and outputs the tuned wavelength.
3. A wavelength tunable narrow linewidth mid-ir laser as claimed in claim 2, wherein: the polarization maintaining optical fiber seed source (1) is an Yb-doped or Er-doped or thulium-doped optical fiber laser, and the line width is less than 0.1 GHz; the wavelength tuning range of a light source emitted by the polarization maintaining optical fiber seed source (1) is set through a control system (9), and the wavelength tuning range is larger than 0.01 nm.
4. A wavelength tunable narrow linewidth mid-ir laser according to claim 3, wherein: the seed laser output fiber (2) is a single-mode polarization maintaining fiber, and outputs linearly polarized laser.
5. A wavelength tunable narrow linewidth mid-ir laser according to claim 4, wherein: the output power of the polarization maintaining optical fiber amplifier (3) is adjusted through the control system (9); the maximum output power is more than 5W; the amplifier output fiber (4) is a polarization maintaining fiber; the output is linearly polarized light.
6. A wavelength tunable narrow linewidth mid-ir laser according to claim 5, wherein: the space light transmission size of the space isolator (6) is larger than the size of the light spot of the input light source; the isolation is greater than 20dB, and the effect of reflected light is prevented.
7. A wavelength tunable narrow linewidth intermediate infrared laser according to claim 6, characterized in that said optical parametric oscillator (8) comprises a first mirror (81), a second mirror (82), a focusing lens (83), a first plano-concave mirror (84), a PP L N crystal module (85), a second plano-concave mirror (86), a third mirror (87), a fourth mirror (88) and an interference filter (89), wherein the first mirror (81) is arranged below the first mirror (81) to change the incident position of the source after polarization direction change, to reflect the horizontal source to the vertical downward direction, the second mirror (82) is arranged below the first mirror (81) to reflect the vertical source to the horizontal direction, the focusing lens (83), the first plano-concave mirror (84), the PP L N crystal module (85) and the second plano-concave mirror (86) are arranged horizontally in sequence on one side of the second mirror (82) and above the second mirror (82) to reflect the light source, the third mirror (84) is arranged above the fourth mirror (88) to output the narrow line width reflection filter (89), and the interference filter (89) is arranged above the fourth mirror (88).
8. A wavelength tunable narrow linewidth mid-ir laser according to claim 7, wherein: the first plano-concave mirror (84), the second plano-concave mirror (86), the third reflector (87) and the fourth reflector (88) form a square ring cavity; the concave surfaces of the first planoconcave mirror (84) and the second planoconcave mirror (86) are placed inwards; and the circular refraction of the optical fiber in the square ring cavity is realized.
9. A wavelength tunable narrow linewidth mid-ir laser according to claim 8, wherein: the focusing lens (83) is used for adjusting the convergent point of the light source reflected by the second reflector (82); the light source after the convergent point is adjusted enters the square ring cavity from the first flat concave cavity mirror (84); the light source performs cyclic reflection of a second planoconcave mirror (86), a third reflector (87), a fourth reflector (88), a first planoconcave mirror (84) and a second planoconcave mirror (86); the light source circularly reflects for n times in the square ring cavity until the gain of the light source in the square ring cavity is larger than the loss of the light source in the square ring cavity, the circulation is stopped, and the light source is reflected by the first plano-concave mirror (84) and then is emitted by the second plano-concave mirror (86); n is a positive integer, and n is greater than or equal to 1.
10. A wavelength tunable narrow linewidth mid-ir laser as claimed in claim 9, wherein: the planes of the first plano-concave mirror (84) and the second plano-concave mirror (86) are totally transparent to the incident light source; the reflectivity of the concave surface to the light source is more than 90%.
11. The wavelength tunable narrow-linewidth intermediate infrared laser device of claim 7 is characterized in that the PP L N crystal module (85) comprises a PP L N crystal (851), a temperature control module (852), a guide rail sliding block (853) and an electric guide rail (854), wherein the electric guide rail (854) is vertically arranged in the axial direction, the guide rail sliding block (853) is sleeved on the electric guide rail (854), the temperature control module (852) is fixedly installed on the guide rail sliding block (853), the PP L N crystal (851) is fixedly installed inside the temperature control module (852), the guide rail sliding block (853) is driven by an external driving mechanism to drive the PP L N crystal (851) and the temperature control module (852) to move in a translation mode along the electric guide rail (854), and the wavelength of a light source is tuned by changing the position of the light source which is shot into the PP L N crystal (851).
12. The wavelength tunable narrow linewidth intermediate infrared laser of claim 11, wherein the temperature control module (852) comprises a refrigeration module (855), a heating module (856), a crystal fixing platen (857) and a crystal protection cover (858), wherein the crystal protection cover (858) is a hollow cover body, the crystal protection cover (858) covers the upper surface of the guide rail slider (853), the refrigeration module (855), the heating module (856), the PP L N crystal (851) and the crystal fixing platen (857) are all arranged inside the crystal protection cover (858), the refrigeration module (855) is fixedly arranged on the upper surface of the guide rail slider (853), the heating module (856) is fixedly arranged on the upper surface of the refrigeration module (855), the PP L N crystal (851) is arranged on the top of the heating module (856), the crystal fixing platen (857) is arranged on the top of the heating module (856), and the crystal fixing platen (857) is used for realizing the compression fixing of the PP L N crystal (851).
13. A wavelength tunable narrow linewidth intermediate infrared laser as claimed in claim 12, characterized in that the temperature of the PP L N crystal 851 is adjusted by adjusting the cooling module (855) and the heating module (856) by the control system (9), and the wavelength of the light source injected into the PP L N crystal 851 is adjusted by adjusting the temperature of the PP L N crystal 851.
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