CN114361930A - Wide tuning intermediate infrared laser based on hollow optical fiber flexible transmission - Google Patents
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- 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
- H01S3/108—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 non-linear optical devices, e.g. exhibiting Brillouin or Raman scattering
- H01S3/1083—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 non-linear optical devices, e.g. exhibiting Brillouin or Raman scattering using parametric generation
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- 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
- H01S3/094042—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a fibre laser
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- 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
- H01S3/101—Lasers provided with means to change the location from which, or the direction in which, laser radiation is emitted
Abstract
A wide tuning mid-infrared laser based on hollow optical fiber flexible transmission belongs to the technical field of optics and laser photoelectron. The optical fiber laser device comprises an optical path which is sequentially arranged and is sequentially connected with an optical fiber laser light source (1), a first half-wave plate (2), a thin film polarizer (3), a second half-wave plate (4), a first focusing lens (5), a multi-period PPLN crystal (6), a first collimating lens (7), an infrared filter (8), a first reflector (9), a second reflector (10), a second focusing lens (11), a hollow optical fiber (12) and a second collimating lens (13). The method can realize the generation of the infrared laser in the wide tuning range, is combined with the hollow-core optical fiber in a system integration mode, couples the laser into the fiber core of the hollow-core optical fiber, and performs low-loss flexible transmission on the generated wide-tuning infrared laser by utilizing the unique advantages of low delay, low dispersion, wide light-conducting passband and high damage threshold of the hollow-core optical fiber.
Description
Technical Field
The invention belongs to the technical field of optics and laser photoelectrons, and particularly relates to a wide-tuning mid-infrared laser based on hollow optical fiber flexible transmission.
Background
The mid-infrared laser is called as a molecular fingerprint area at 2-5 mu m, contains absorption peaks of a plurality of gas molecules, and has important application value in the fields of military countermeasure, environmental monitoring, radar, biomedical science, spectral research and the like. The current generation methods of mid-infrared laser mainly include quantum cascade laser and interband cascade laser, lead salt semiconductor laser and gallium antimonide laser, gas laser, chemical laser, optical parametric oscillator, free electron laser, solid laser, fiber laser, etc. The generation scheme of the mid-infrared ultrashort pulse with high peak power and wide tuning range is a research hotspot in the technical field of laser at home and abroad. For the generation of the mid-infrared laser with tunable wavelength, the main mode is to generate a mid-infrared supercontinuum by pumping a high-nonlinearity fiber through an ultrashort pulse light source with high peak power. In addition, the mid-infrared laser with wide tuning and high efficiency can be generated by constructing an Optical Parametric Generator (OPG), an Optical Parametric Amplifier (OPA), an Optical Parametric Oscillator (OPO) and a nonlinear Difference Frequency (DFG) by utilizing a nonlinear frequency conversion technology. At present, the high nonlinear optical fiber used in the mode of generating the mid-infrared supercontinuum by pumping the high nonlinear optical fiber through the ultrashort pulse light source with high peak power has certain problems, such as easy deliquescence and damage of the optical fiber, low output power, difficult stable long-time operation, relatively complex structure and high cost. In contrast, the wide-tuning mid-infrared laser with simple structure and stable system can be realized by the nonlinear frequency conversion technology. Particularly, according to the OPG scheme, only one pulse pump multi-period PPLN crystal of a near-infrared band needs to be prepared, the generation of wide-tuning intermediate infrared laser can be realized through a conversion process under a self-luminous parameter, a complex cavity mirror and a complex light path are not needed, and the system structure is simpler.
With the rapid development of laser technology, optical fibers are used as carriers for laser transmission, so that the laser technology is more widely applied. In 1966, mr. high roll of chinese physicist explicitly suggested that optical fiber could be used as a medium for information communication in his paper optical frequency medium fiber surface waveguide, which could greatly reduce the loss of quartz fiber and could draw fiber with loss lower than 20dB/km, which was confirmed by corning corporation in 1970 and thus widely used in communication. The quartz-based optical fiber has the advantages of small transmission loss, good chemical stability, high mechanical strength, good bending performance and the like, achieves great success in visible light and near infrared bands, and is widely applied to the fields of communication, laser transmission, detection, spectral analysis, sensing and the like at present. However, in the mid-infrared band, since the absorption coefficient of the quartz material increases exponentially, the loss of the optical fiber increases sharply, making it difficult to perform laser transmission in the mid-infrared band. Due to the lack of optical fibers capable of transmitting mid-infrared laser light with low loss, high efficiency and stability, in many applications, mid-infrared laser light can only be transmitted and detected through a free space optical path, which means that the structure of the whole system is very complex and has poor stability, and the requirements of military photoelectric countermeasure on lightness, convenience in carrying, integration and the like of photoelectric devices and the requirements of the biomedical field on stability, flexibility and flexible transmission are difficult to meet. Thus greatly affecting the application range of the mid-infrared band.
In order to meet the requirements of laser transmission in the mid-infrared band, soft glass optical fibers have come into existence, and although the optical fibers have lower material absorption and transmission loss in the mid-infrared band, the optical fibers have the defects of large nonlinear coefficient, low damage threshold, high preparation difficulty, poor mechanical stability and chemical stability, poor bending resistance and the like, so that the optical fibers cannot meet the standards of military application.
Based on the problems of the mid-infrared laser transmission, the hollow-core photonic crystal fiber provides a new solution for the mid-infrared laser transmission. In 1999, the Cregand et al designed the first photonic band gap type hollow core photonic crystal fiber and surprised the optical community. The optical fiber still adopts quartz as a base material, and light is guided by an air fiber core through arranging a special band gap or an anti-resonance structure. Therefore, the quartz material has the advantages of high mechanical strength, corrosion resistance, high melting point, no influence of external electromagnetic radiation, capability of working in a severe environment and the like, has the advantage of air light guide, and overcomes the problems caused by the quartz material. Later professor feah Benabid, university of bass, uk, 2002, reported a hollow-core fiber with a Kagome cladding structure, which has a very wide optical transmission passband but high loss. Although the cladding structure is similar to a bandgap fiber, it guides light according to the principle of antiresonance. The fundamental mode in the fiber core of the hollow anti-resonance fiber has about 99.99% of energy which can be kept in the air core, the damage effect of the pump laser to the fiber is reduced by several orders of magnitude compared with quartz, and the absorption of the quartz material to the mid-infrared laser is greatly reduced, so that the transmission loss of the fiber in the mid-infrared band is greatly reduced, which means that the fiber can create an ideal environment similar to free space, low dispersion, low nonlinearity, low time delay and low transmission loss for light wave transmission. This has natural advantages over existing soft glass optical fibers. Therefore, the hollow-core optical fiber plays an extremely important role in flexible transmission of mid-infrared laser light.
The wide-tuning mid-infrared laser can be coupled into the fiber core of the hollow-core optical fiber in a system integration mode, so that stable, flexible and flexible transmission of the mid-infrared laser can be realized. The core diameter of the intermediate infrared hollow-core optical fiber is larger, so that the coupling efficiency can be improved to a higher level. In addition, the hollow optical fiber is bent, so that the flexible transmission of the intermediate infrared laser can be realized. Therefore, by combining the wide-tuning and system-stable mid-infrared laser light source with the hollow optical fiber, the long-distance, stable and efficient flexible transmission of the wide-tuning mid-infrared laser can be realized.
The invention content is as follows:
the invention aims to establish a wide-tuning mid-infrared laser based on hollow-core optical fiber flexible transmission, which combines mid-infrared laser with hollow-core optical fiber in a system integration mode on the premise of realizing mid-infrared laser in a wide tuning range, solves the problem that mid-infrared laser is difficult to stably, flexibly and efficiently transmit, can realize mid-infrared laser flexible transmission in a wide tuning range only through one system, and has simple and efficient system structure. The problem that mid-infrared laser is difficult to apply to military photoelectric countermeasure and laser medical surgery is solved.
The technical solution of the invention is as follows:
a wide tuning mid-infrared laser based on hollow optical fiber flexible transmission belongs to the technical field of optics and laser photoelectron. The basic structure of the wide-tuning intermediate infrared laser based on hollow optical fiber flexible transmission comprises a sequentially arranged optical path connection optical fiber laser light source (1), a first half-wave plate (2), a film polarizer (3), a second half-wave plate (4), a first focusing lens (5), a multi-period PPLN crystal (6), a first collimating lens (7), an infrared filter (8), a first reflector (9), a second reflector (10), a second focusing lens (11), a hollow optical fiber (12) and a second collimating lens (13), and the building of the wide-tuning intermediate infrared laser based on hollow optical fiber flexible transmission is realized. (ii) a
The wide-tuning intermediate infrared laser source is composed of the optical fiber laser source (1), the first half-wave plate (2), the thin film polaroid (3), the second half-wave plate (4), the first focusing lens (5) and the multi-period PPLN crystal (6).
The optical fiber laser light source is a high-power full-polarization-maintaining ytterbium-doped picosecond optical fiber laser light source.
The first half-wave plate, the film polaroid and the second half-wave plate are used for forming a power and polarization direction adjusting system.
The first half wave plate can rotate by an angle and is used for controlling the power. The power is controlled to be within a damage threshold of the PPLN crystal.
The thin film polarizer is used for stripping the pump light.
The second half-wave plate can rotate by an angle and is used for adjusting the polarization direction of the light beam. Adjust to vertical polarization direction to achieve a non-linear frequency conversion process.
The first focusing lens is used for completely coupling the light beam into the PPLN crystal and improving the peak power of the light beam so as to reach an optical parameter generation threshold value.
The focal length of the first focusing lens is selected by the size of a laser spot before focusing and the size of the multi-period PPLN crystal.
The focal length of the first focusing lens is selected to ensure complete coupling into the length path of the multicycle PPLN crystal and to avoid damage to the crystal due to too high peak power density caused by too small light spots.
The multicycle PPLN crystal is used for realizing the generation of the wide-tuning mid-infrared laser through the nonlinear frequency conversion technology.
The multicycle PPLN crystal is placed on a five-dimensional adjusting frame provided with a temperature controller of a temperature control furnace, 15 cycles are included in the multicycle PPLN crystal, and the temperature can be adjusted at 0-200 ℃. The generation of the wide-tuning mid-infrared laser is realized by adjusting the period of the PPLN crystal and the temperature of the temperature control furnace.
The first collimating lens, the first reflector and the second reflector form a collimating device of the mid-infrared laser.
The first collimating lens is used for collimating laser emitted by the multi-period PPLN crystal into parallel light, and the size of the focal length of the collimating lens is selected according to actual conditions.
The infrared filter is used for filtering out laser in other wave bands except the mid-infrared laser, so that transmission of the mid-infrared laser with required wavelength is obtained.
The angle and the position of the third reflector and the fourth reflector are adjustable, and the third reflector and the fourth reflector are used for deflecting the light path to enable all optical elements to be coaxial and adjusting the collimation of light beams.
The second focusing lens and the hollow optical fiber placed on the three-dimensional adjusting frame form a laser coupling device.
The focal length of the second focusing lens is determined by the core size of the hollow-core optical fiber.
The parameters of the hollow-core optical fiber (12) can be selected according to the actual application requirements, the basic structure is that a quartz material is used as a substrate, and the fiber core is air; the outermost layer of the optical fiber is a layer of hollow-core quartz glass, a plurality of quartz micro-nanotubes are attached to the inner surface of the hollow-core quartz glass, a hollow-core structure consisting of the quartz micro-nanotubes is used as a fiber core, namely the hollow-core optical fiber (12) comprises a hollow-core optical fiber core region (corresponding to 12a), a hollow-core optical fiber cladding air region (corresponding to 12b), a hollow-core optical fiber cladding high-refractive-index quartz region (corresponding to 12c) and a hollow-core optical fiber outer cladding region (corresponding to 12d), the inner surface of the quartz glass and the uniformly distributed quartz micro-nanotubes are internally tangent to form the hollow-core structure of the optical fiber, and the outer surface of the quartz micro-nanotubes are internally tangent to the inner surface of the hollow-core quartz glass.
Due to the hollow coreThe core of the anti-resonance optical fiber is air, and the light guiding mechanism of the anti-resonance optical fiber is different from the traditional total internal reflection light guiding mechanism, namely the anti-resonance reflection optical waveguide. We can consider the high index quartz wall surrounding the core as an F-B cavity, which reflects and is strongly confined in the core of the waveguide when the wavelength of light in the core is far away from the resonance region, i.e. as long as the wavelength does not meet the resonance condition in the formula, the reflection coefficient of the F-B cavity is very high. Only when the wavelength of the light in the core matches the resonance wavelength of the F-B cavity (resonance condition is satisfied:
) Light will leak out of the core through the high index cladding. Theoretically, light can be guided at any wavelength without resonance, so that the hollow anti-resonance optical fiber basically has no influence of material limitation, has a wide light guide passband, can reduce transmission loss to be very low, can transmit over a long distance, has no influence of material nonlinearity, has a very high laser damage threshold, and has great advantages in flexible transmission of mid-infrared laser.
And the focal length of the second collimating lens is selected according to the actual application requirement.
The optical elements need to be centered on the same line, and the center planes of the devices are placed perpendicular to the axis or the optical path.
Technical solution more than adopting, this patent is novel to have following advantage at least:
the patent provides a wide tuning mid infrared laser based on flexible transmission of hollow optic fibre, uses high power full polarization maintaining to mix a multicycle PPLN crystal of ytterbium picosecond fiber laser light source pumping at first, utilizes nonlinear frequency conversion technique to build the mid infrared laser light source that has wide tuning range, and simple structure is high-efficient. Then the wide tuning mid-infrared laser light source is combined with a hollow-core optical fiber, laser is coupled into a fiber core of the hollow-core optical fiber, and the generated wide tuning mid-infrared laser is subjected to low-loss flexible transmission by utilizing the unique advantages of low delay, low dispersion, wide light guide passband and high damage threshold of the hollow-core optical fiber. The problems that the stability of the mid-infrared laser in a free space optical path with a complex structure is poor and flexible transmission is difficult are solved, the mid-infrared laser transmission with any wavelength can be basically generated through wavelength tuning, and the quality of laser beams can be better when the laser transmitted through the hollow optical fiber obtains the long-distance, stable and flexible transmission characteristics. Compared with the prior art, the wide tuning mid-infrared laser based on the hollow-core optical fiber flexible transmission is simpler, more flexible and more efficient, and has good application prospect in the fields of military, medical treatment and the like.
Drawings
Fig. 1 is a schematic cross-sectional view of a mid-infrared hollow-core optical fiber according to a first embodiment of the present invention.
In the figure 12 a-hollow core fiber core region, 12 b-hollow fiber cladding air region, 12 c-hollow fiber cladding quartz region, 12 d-hollow fiber overcladding region.
Fig. 2 is a schematic diagram of an experimental setup for a wide-tuning mid-ir laser source according to a second embodiment of the present invention.
Figure 3 is a graph of the transmission loss in the mid-infrared wavelength band of interest for a hollow core optical fiber according to a third embodiment of the present invention.
FIG. 1 is a fiber laser light source; 2. a first half wave plate; 3. a thin film polarizer; 4. a second half-wave plate; 5. a first focusing lens; 6. a multicycle PPLN crystal; 7. a first collimating lens; 8. an infrared filter; 9. a first reflector; 10. a second reflector; 11. a second focusing lens; 12. a hollow-core optical fiber; 13. a second collimating lens.
Detailed Description
The following describes in further detail specific embodiments of the present invention with reference to the accompanying drawings.
FIG. 2 is a schematic diagram of an experimental setup of a wide-tuning mid-infrared laser based on hollow-core fiber flexible transmission according to the present invention, including sequentially connected 1. fiber laser light source; 2. a first half wave plate; 3. a thin film polarizer; 4. a second half-wave plate; 5. a first focusing lens; 6. a multicycle PPLN crystal; 7. a first collimating lens; 8. an infrared filter; 9. a first reflector; 10. a second reflector; 11. a second focusing lens; 12. a hollow-core optical fiber; 13. a second collimating lens.
A fiber laser light source (1); a first half-wave plate (2); a thin film polarizing plate (3); a second half-wave plate (4); a first focusing lens (5); the wide-tuning intermediate infrared laser light source is composed of a multi-period PPLN crystal (6), the optical fiber laser light source (1) is a high-power full-polarization-maintaining ytterbium-doped picosecond optical fiber laser, a power and polarization adjusting system is composed of a first half-wave plate (2), a thin film polarizing plate (3) and a second half-wave plate (4), and the polarization direction is adjusted to be a vertical polarization direction so as to improve the conversion efficiency of the nonlinear frequency conversion process. The first focusing lens (5) is selected to ensure that the size of a focusing light spot in the crystal path is smaller than the thickness of the crystal and that the light beam is transmitted in the range of the length path which is completely coupled into the crystal. The diameter of an output light spot of the optical fiber laser light source (1) is measured by using a knife edge method, and then the focal length of the required lens is calculated. And then pumping the focused light beam into a multicycle PPLN crystal (6) which comprises 15 cycles and is arranged on a five-dimensional adjusting frame provided with a temperature controller of a temperature control furnace, wherein the temperature can be tuned within the range of 0-200 ℃, and the cycle of the PPLN crystal and the temperature are adjusted simultaneously to change the central wavelength of output laser to form a wide-tuning intermediate infrared laser light source.
After generating the wide tuning mid-infrared laser light source, the light passes through a first collimating lens (7); an infrared filter (8); a first mirror (9); a second mirror (10); a second focusing lens (11); a hollow-core optical fiber (12); and the second collimating lens (13) forms a middle infrared laser transmission system based on hollow-core optical fiber flexible transmission. Because the laser output after the multi-period PPLN crystal (6) is pumped is divergent and contains laser with other wavelengths except for pump light besides the intermediate infrared laser, a first collimating lens (7) is added to collimate the beam into parallel light, an infrared filter (8) is added to allow only the laser with the required wavelength to penetrate through, and the folded light path is adjusted through a first reflector (9) and a second reflector (10), so that the optical elements are ensured to be coaxially arranged on the same straight line.
FIG. 1 is a schematic end view of a hollow-core fiber used in the present invention, in which a ten-tube hollow-core antiresonant fiber has a core region (corresponding to 12a) of about 128 μm core diameter and a high-refractive-index silica region (corresponding to 12c) surrounded by ten hollow-core silica capillaries as a ring; the inner diameter of the quartz tube is a cladding air region (corresponding to 12b) of the hollow-core optical fiber, the average is about 40 μm, and the thickness of the cladding tube wall is about 600-650 nm; the outer cladding region (12 d for the corresponding) of the hollow-core fiber is connected with the anti-resonant inner cladding region of the hollow-core fiber, and the structural parameters can be selected according to the specific application requirements. And a second focusing lens (11) is used for coupling the laser into the fiber core of the hollow-core optical fiber, the hollow-core optical fiber (12) is placed on the three-dimensional adjusting frame, and the coupling efficiency is improved by finely adjusting the position of the hollow-core optical fiber. The output light beam of the optical fiber is collimated by a second collimating lens (13) according to the requirement, and the structural parameters and the length of the hollow-core optical fiber (12) are also selected according to the practical application condition.
Fig. 3 is a graph of measured transmission loss of the hollow-core antiresonant optical fiber used in the middle infrared laser important transmission band. The hollow anti-resonance optical fiber can realize low-loss laser transmission of a wave band of 1.4-4.3 mu m.
Claims (9)
1. A wide tuning mid-infrared laser based on hollow-core optical fiber flexible transmission is characterized in that: the optical fiber laser device comprises an optical fiber laser light source (1), a first half-wave plate (2), a thin film polarizer (3), a second half-wave plate (4), a first focusing lens (5), a multi-period PPLN crystal (6), a first collimating lens (7), an infrared filter (8), a first reflector (9), a second reflector (10), a second focusing lens (11), a hollow optical fiber (12) and a second collimating lens (13) which are connected in an optical path.
2. A wide-tuning mid-ir laser based on hollow-core fiber flexible transport according to claim 1, characterized in that: the wide-tuning intermediate infrared laser source comprises an optical fiber laser source (1), a first half-wave plate (2), a thin film polaroid (3), a second half-wave plate (4), a first focusing lens (5) and a multi-period PPLN crystal (6); the first half-wave plate, the film polaroid and the second half-wave plate are used for forming a power and polarization direction adjusting system; the middle infrared laser flexible transmission system consists of a first collimating lens (7), an infrared filter (8), a first reflector (9), a second reflector (10), a second focusing lens (11), a hollow optical fiber (12) and a second collimating lens (13); the first collimating lens, the third reflector and the fourth reflector form a collimating device of the mid-infrared laser.
3. A wide-tuning mid-ir laser based on hollow-core fiber flexible transport according to claim 1, characterized in that: the optical fiber laser light source is a high-power full-polarization-maintaining ytterbium-doped picosecond optical fiber laser light source; the first half-wave plate can rotate by an angle and is used for controlling the power; the film polaroid is used for stripping the pump light; the second half-wave plate can rotate by an angle and is used for adjusting the polarization direction of the light beam; the first focusing lens is used for completely coupling the light beam into the PPLN crystal and improving the peak power of the light beam so as to reach an optical parameter generation threshold value.
4. A wide-tuning mid-ir laser based on hollow-core fiber flexible transport according to claim 1, characterized in that: the focal length of the first focusing lens is determined by the size of a laser spot before focusing and the size of the multi-period PPLN crystal;
the multicycle PPLN crystal is placed on a five-dimensional adjusting frame provided with a temperature controller of the temperature control furnace, and the wide tuning range of the intermediate infrared laser is realized by adjusting the period of the PPLN crystal and the temperature of the temperature control furnace.
5. A wide-tuning mid-ir laser based on hollow-core fiber flexible transport according to claim 1, characterized in that: the first collimating lens is used for collimating laser emitted by the PPLN crystal into parallel light, and the size of the focal length of the collimating lens is selected according to actual conditions.
6. A wide-tuning mid-ir laser based on hollow-core fiber flexible transport according to claim 1, characterized in that: the infrared filter is used for filtering out laser in other wave bands except the mid-infrared laser, so that transmission of the mid-infrared laser with required wavelength is obtained. The angle and the position of the first reflector and the second reflector are adjustable, and the first reflector and the second reflector are used for deflecting the light path to enable all optical elements to be coaxial and adjusting the collimation of light beams.
7. A wide-tuning mid-ir laser based on hollow-core fiber flexible transport according to claim 1, characterized in that: the second focusing lens and the hollow optical fiber placed on the three-dimensional adjusting frame form a laser coupling device; the focal length of the second focusing lens is determined by the core size of the hollow core optical fiber.
8. A wide-tuning mid-ir laser based on hollow-core fiber flexible transport according to claim 1, characterized in that: the parameters of the hollow-core optical fiber can be selected according to specific application requirements, and the basic structure of the hollow-core optical fiber mainly comprises a hollow-core optical fiber core region, a hollow-core optical fiber cladding air region, a hollow-core optical fiber cladding quartz region and a hollow-core optical fiber cladding region. The outermost layer of the optical fiber is a layer of hollow quartz glass, the inner surface of the quartz glass is internally tangent with a hollow structure consisting of uniformly distributed quartz micro-nano tubes, the center of the hollow structure consisting of the quartz micro-nano tubes is an air fiber core, and the outer surface of the quartz micro-nano tubes is internally tangent with the inner surface of the hollow quartz glass.
9. A wide-tuning mid-ir laser based on hollow-core fiber flexible transport according to claim 1, characterized in that: the focal length of the second collimating lens is selected and installed according to application requirements; the optical elements are required to be centered on the same straight line, and the central planes of the devices are arranged perpendicular to the axis or the optical path.
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| CN114964203A (en) * | 2022-08-01 | 2022-08-30 | 中国船舶重工集团公司第七0七研究所 | Depolarization method and system for hollow-core microstructure fiber optic gyroscope |
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| CN1369733A (en) * | 2001-06-27 | 2002-09-18 | 天津大学 | Distributed optical-fibre Raman Amplifier using novel pump source |
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|---|---|---|---|---|
| CN114964203A (en) * | 2022-08-01 | 2022-08-30 | 中国船舶重工集团公司第七0七研究所 | Depolarization method and system for hollow-core microstructure fiber optic gyroscope |
| CN114964203B (en) * | 2022-08-01 | 2022-10-11 | 中国船舶重工集团公司第七0七研究所 | Depolarization method and system for hollow-core microstructure fiber optic gyroscope |
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