CN114976828B - Continuous wave 330nm sodium star-guiding laser system and application thereof - Google Patents
Continuous wave 330nm sodium star-guiding laser system and application thereof Download PDFInfo
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Abstract
The invention relates to a continuous wave 330nm sodium star-guiding laser system and application thereof, comprising a continuous wave 1122nm optical fiber Raman laser, a space isolator, a diamond crystal Raman frequency doubling resonator and a single-pass frequency doubling module, wherein the continuous wave 1122nm optical fiber Raman laser is injected into the diamond crystal Raman frequency doubling resonator after passing through the space isolator, and the laser with the wavelength of 1320nm of a first Stokes spectral line is obtained through the Raman effect of the diamond crystal in a cavity, meanwhile, continuous wave single-frequency 660nm laser is generated and output through the second harmonic generation technology of the frequency doubling crystal in the cavity, and finally continuous wave single-frequency 330nm laser resonating with the absorption spectral line of sodium atoms is obtained through the single-pass frequency doubling module. The continuous wave 330nm sodium star-guiding laser system and the application thereof realize the laser output with high average power and high beam quality of continuous wave and single frequency 330 nm.
Description
Technical Field
The invention belongs to the technical field of crystal Raman lasers, and particularly relates to a continuous wave 330nm sodium star-guiding laser system and application thereof.
Background
In the self-adaptive optical system, the laser is utilized to excite sodium layer atoms to obtain high-brightness beacon light, so that wavefront distortion caused by atmospheric disturbance is compensated, the resolution of the foundation optical telescope can be greatly improved, and the technology is always a research hot spot in the astronomical observation field. At present, a monochromatic 589nm laser source is a main technical scheme of sodium star-guiding laser and is widely used, namely, 589nm monochromatic laser is utilized to excite sodium layer atoms to generate monochromatic fluorescence with the same frequency, backward fluorescence is transmitted to a telescope through the atmosphere, a self-adaptive optical system detects and compensates wavefront distortion caused by atmospheric disturbance, and finally, the near-diffraction limit observation resolution is realized. However, the sodium beacon star based on monochromatic laser has irremovable atmospheric tilt aberration, which affects the performance of the sodium guide star adaptive optics system. The research shows that the 330nm laser can also resonate with sodium atoms, and compared with 589nm monochromatic laser excitation, the 330nm laser excitation of sodium atoms can generate multi-band fluorescence of 2207nm, 1104nm, 589nm, 330nm and the like, and the multicolor sodium beacon can effectively eliminate atmospheric oblique aberration. Therefore, the polychromatic sodium star-guiding laser light source based on 330nm laser has important application and scientific research value. Compared with 330nm laser with high peak power pulse, 330nm laser with continuous wave operation has higher average power, and the excited fluorescent photons in unit time have high number density, thereby being beneficial to telescope acquisition and avoiding nonlinear attenuation effect of atmosphere to the high peak power pulse laser.
The Chinese patent application CN 106299997A discloses a solid laser source suitable for generating multi-color sodium guide star, and a related patent of a 330nm laser, which discloses that a semiconductor pumping light source is utilized to generate laser into pulse laser, and the laser with a first wavelength and the laser with a second wavelength are respectively doubled by a double frequency module and a quadruple frequency module, and the final output is converted into 330nm pulse laser.
However, the output beam of the existing 330nm laser disclosed in the patent publication is pulse laser, which is limited by severe thermal effect of a semiconductor laser gain medium, high-power continuous wave output cannot be realized, a pumping source is a semiconductor pumping light source, and a semiconductor is used as a pumping, so that the quality of the laser beam is poor.
Several methods for obtaining 330nm lasers are described in "polychromatic laser star using a single laser at 330 nm" published in adaptive optics progression II ", 6.28.2006: 1. the Nd-doped YAG or YLF gain media has a very strong laser emission spectrum at 1.3 μm. With frequency quadrupling, a 330.3nm laser can be obtained, but is limited by the severe thermal effects of the gain medium, which is also the pulsed laser output. 2. YAG laser at 532nm and 870nm Ti: the saphire laser sum frequency produces 330.3nm laser light, which is very complex, expensive, and also a pulsed laser output. ( See in detail: jean-Paul Pique, ioana c.molcovan, vincent fesque, hugues Guillet de Chatellus, fabien Marc, "Polychromatic laser guide star using a single laser at nm," proc.spie 6272,Advances in Adaptive Optics II,62723D (28June 2006); https:// doi.org/10.1117/12.692350 )
Wherein, the gain medium of YAG or YLF doped with Nd has strong laser emission spectrum at 1.3 mu m, and the laser with 330.3nm can be obtained by frequency doubling, but is limited by serious thermal effect of the gain medium, and the laser is also pulsed laser output.
Wherein, using a 532nm Nd: YAG laser and 870nm Ti: the saphire laser sum frequency produces 330.3nm laser light, which is very complex, expensive, and also a pulsed laser output.
Disclosure of Invention
A first object of the present invention is to provide a continuous wave 330nm sodium satellite-guided laser system, which realizes continuous wave, single frequency 330nm high average power, high beam quality laser output, in view of the shortcomings of the prior art.
For this purpose, the above object of the present invention is achieved by the following technical solutions:
the continuous wave 330nm sodium star-guiding laser system comprises a continuous wave 1122nm optical fiber Raman laser, a space isolator, a diamond crystal Raman frequency doubling resonator and a single-pass frequency doubling module, wherein the continuous wave 1122nm optical fiber Raman laser is injected into the diamond crystal Raman frequency doubling resonator after passing through the space isolator, laser with a first Stokes spectral line wavelength 1320nm is obtained through an intracavity diamond crystal Raman effect, meanwhile, continuous wave single-frequency 660nm laser is generated and output through an intracavity frequency doubling crystal second harmonic generation technology, and finally continuous wave single-frequency 330nm laser resonating with a sodium atom absorption spectral line is obtained through the single-pass frequency doubling module, wherein the intracavity frequency doubling crystal is the first frequency doubling crystal.
Further, the continuous wave 1122nm fiber Raman laser outputs laser light with a laser spectrum linewidth smaller than that of the diamond Raman gain linewidth, namely smaller than 45GHz.
Further, the continuous wave 1122nm fiber Raman laser comprises 1070nm pump laser, 1122nm high-reflectivity grating, a section of Raman gain fiber and 1122nm low-reflectivity grating, wherein the 1070nm pump laser operates as continuous wave, and is injected into a 1122nm Raman fiber resonant cavity formed by the 1122nm high-reflectivity grating, the section of Raman gain fiber and the 1122nm low-reflectivity grating, and the 1122nm laser with the continuous wave and the spectrum width smaller than 45GHz is output after passing through the 1122nm low-reflectivity grating.
Further, the continuous wave 1122nm fiber Raman laser comprises 1122nm seed laser, a first wavelength division multiplexer, a section of Raman gain fiber, a second wavelength division multiplexer and 1070nm pump laser, wherein the 1122nm seed laser is continuous wave operation, the spectrum width is smaller than 45GHz, the continuous wave operation is performed by the first wavelength division multiplexer, the section of Raman gain fiber is injected, the 1070nm pump laser is continuous wave operation, the section of Raman gain fiber is injected from the back direction after the continuous wave operation is performed by the second wavelength division multiplexer, the 1122nm seed laser is amplified by the 1070nm pump laser in the Raman fiber, and finally the continuous wave, 1122nm laser with the spectrum width smaller than 45GHz is output by the second wavelength division multiplexer.
Further, based on the fact that the Raman effect of the diamond crystal has no space hole burning effect and inner cavity frequency multiplication longitudinal mode gain competition effect, the output continuous wave 660nm laser operates in a single frequency mode.
Further, the diamond crystal Raman frequency doubling resonator comprises an input coupling mirror, a diamond crystal, a first frequency doubling crystal and an output coupling mirror;
the laser oscillation wavelength of the diamond crystal Raman frequency doubling resonator is 1320nm, and the resonator has a high quality factor at 1320 nm;
the diamond crystal is used as a Raman gain medium, and the surface coating of the diamond crystal requires high transmittance at 1070nm, 1320nm and 660 nm;
the surface coating of the input coupling mirror requires high transmittance at 1070nm, high reflectivity at 1320nm and high reflectivity at 660 nm;
the surface coating of the output coupling mirror requires high reflectivity at 1070nm, high reflectivity at 1320nm and high transmissivity at 660 nm;
the intracavity frequency doubling crystal is lithium triborate crystal, and high transmittance at 1070nm, 1320nm and 660nm is required for crystal surface coating.
Further, the single-pass frequency multiplication module sequentially comprises a focusing lens and a second frequency multiplication crystal, wherein the focusing lens is used for focusing 660nm laser generated by the diamond crystal Raman frequency multiplication resonator in claims 1 and 5; the second frequency doubling crystal 4-2 is barium metaborate crystal, and high transmittance at 660nm and 330nm is required for plating films on the surface of the crystal.
It is a further object of the present invention to provide an application of a continuous wave 330nm sodium guided star laser system that addresses the deficiencies of the prior art.
For this purpose, the above object of the present invention is achieved by the following technical solutions:
according to the application of a continuous wave 330nm sodium star-guiding laser system in the production of a 330nm laser light source operated by continuous waves.
Further, the method comprises the following steps:
s1, a continuous wave 1122nm optical fiber Raman laser outputs laser light for continuous light operation, and the laser spectrum linewidth is smaller than the diamond Raman gain linewidth, namely smaller than 45GHz;
s2: the 1122nm laser generated in the step S1 is smaller than 45GHz, and reverse light is filtered through a space isolator;
s3: inputting 1122nm laser which is less than 45GHz and is obtained in the step S2 into a diamond crystal Raman frequency doubling resonator, and outputting continuous wave 660nm laser which runs at a single frequency based on a diamond crystal Raman effect without a space hole burning effect and an inner cavity frequency doubling longitudinal and transverse gain competition effect;
s4: step S3, the 660nm laser is focused by a focusing lens, and then frequency multiplication is carried out by a second frequency multiplication crystal to obtain continuous wave 330nm pulse laser resonating with the sodium atom absorption spectrum;
step S1, utilizing 1070nm continuous pump light to pass through a resonant cavity formed by 1122nm high-reflectivity grating, a section of Raman gain fiber and 1122nm low-reflectivity grating, and outputting laser with spectral width smaller than 45GHz; or, in the step S1, the 1122nm seed laser is utilized to realize continuous wave 1122nm laser with the output spectral width smaller than 45GHz through 1070nm laser reverse pumping Raman amplification.
The invention provides a continuous wave 330nm multi-color sodium star-guiding laser system, which realizes the laser output of continuous wave, single frequency 330nm with high average power and high beam quality, can be used as a laser light source of a multi-color sodium star-guiding self-adaptive optical system, and can simultaneously generate multi-band fluorescence of 2207nm, 1104nm, 589nm, 330nm and the like when 330nm laser excites sodium atoms, and the multi-color sodium beacon can effectively eliminate atmospheric oblique aberration. Compared with 330nm laser with high peak power pulse, 330nm laser operated by continuous wave has higher average power, more fluorescence photons are returned in unit time, and the peak power of the continuous wave laser is low, thus avoiding nonlinear attenuation effect of atmosphere to the high peak power pulse laser. Therefore, the continuous wave 330nm laser related to the invention has technical advantages and important application value.
Drawings
FIG. 1 is a schematic diagram of a continuous wave 330nm multi-color sodium satellite-guiding laser system according to embodiment 1 of the present invention;
FIG. 2 is a schematic diagram of a continuous wave 1122nm fiber Raman laser, provided in embodiment 1 of the present invention, which outputs laser light with a spectral width less than 45GHz, by using a resonant cavity formed by 1070nm continuous pump light passing through a 1122nm high reflectivity grating, a section of Raman gain fiber, and a 1122nm low reflectivity grating;
FIG. 3 is a schematic diagram of a Raman frequency doubling resonator of a diamond crystal according to embodiment 1 of the present invention;
fig. 4 is a schematic diagram of a single-pass frequency multiplication module provided in embodiment 1 of the present invention;
FIG. 5 is a schematic diagram of a continuous wave 1122nm fiber Raman laser with an output spectral width less than 45GHz, which is realized by utilizing 1122nm seed laser to perform 1070nm laser reverse pumping Raman amplification;
in the drawing, a continuous wave 1122nm fiber Raman laser 1;1070nm pump laser 1-1-1;1122nm high reflectivity grating 1-1-2; 1-1-3 of Raman gain fiber; 1122nm low reflectivity grating 1-1-4;1122nm seed laser 1-2-1; a first wavelength division multiplexer 1-2-2; a section of Raman gain fiber 1-2-3; a second wavelength division multiplexer 1-2-4;1070nm pump laser 1-2-5; a space isolator 2; a diamond crystal raman frequency doubling resonator 3; an input coupling mirror 3-1; 3-2 parts of diamond crystals; a first frequency doubling crystal 3-3; output coupling mirrors 3-4; a single-pass frequency multiplication module 4; a focusing lens 4-1; and a second frequency doubling crystal 4-2.
Detailed Description
The invention will be described in further detail with reference to the drawings and specific embodiments.
The invention discloses a continuous wave 330nm sodium satellite-guiding laser system, which comprises a continuous wave 1122nm optical fiber Raman laser 1, a space isolator 2, a diamond crystal Raman frequency doubling resonator 3 and a single-pass frequency doubling module 4 which are sequentially connected, wherein the continuous wave 1122nm optical fiber Raman laser 1 is injected into the diamond crystal Raman frequency doubling resonator 3 after passing through the space isolator 2, laser with a first Stokes spectral line wavelength 1320nm is obtained through the Raman effect of an intracavity diamond crystal, meanwhile, continuous wave single-frequency 660nm laser is generated and output through the second harmonic generation technology of the intracavity frequency doubling crystal, and finally continuous wave single-frequency 330nm laser which resonates with a sodium atom absorption spectral line is obtained through the single-pass frequency doubling module (4).
The continuous wave 1122nm fiber Raman laser 1 outputs laser light for continuous light operation, and the laser spectrum linewidth is smaller than the diamond Raman gain linewidth, namely smaller than 45GHz.
In the invention, the continuous wave 1122nm fiber Raman laser comprises 1070nm pump laser 1-1-1, 1122nm high-reflectivity grating 1-1-2, one section of Raman gain fiber 1-1-3 and 1122nm low-reflectivity grating 1-1-4, the 1070nm pump laser 1-1-1 is operated as continuous wave, and 1122nm Raman fiber resonant cavity formed by the 1122nm high-reflectivity grating 1-1-2, one section of Raman gain fiber 1-1-3 and 1122nm low-reflectivity grating 1-1-4 is injected, and the 1122nm laser with the spectral width smaller than 45GHz is output after passing through the 1122nm low-reflectivity grating 1-1-4. The invention provides a continuous wave 1122nm fiber Raman laser which utilizes 1070nm continuous pumping light to pass through a resonant cavity formed by 1122nm high-reflectivity grating, a section of Raman gain fiber and 1122nm low-reflectivity grating and outputs laser with spectral width smaller than 45GHz.
The invention relates to a diamond crystal Raman frequency doubling resonator which comprises an input coupling mirror 3-1, a diamond crystal 3-2, a first frequency doubling crystal 3-3 and an output coupling mirror 3-4 which are sequentially connected, wherein the laser oscillation wavelength of the diamond crystal Raman frequency doubling resonator is 1320nm, and the resonator has a high quality factor at 1320 nm;
the diamond crystal is used as a Raman gain medium, and the film coating on the 3-2 surface of the diamond crystal requires high transmittance at 1070nm, 1320nm and 660 nm;
the surface coating of the input coupling mirror 3-1 is required to have high transmittance at 1070nm, high reflectivity at 1320nm and high reflectivity at 660 nm;
the surface coating of the output coupling mirror 3-4 requires high reflectivity at 1070nm, high reflectivity at 1320nm and high transmissivity at 660 nm;
the first frequency doubling crystal 3-3 is a lithium triborate crystal, and high transmittance at 1070nm, 1320nm and 660nm is required for coating the surface of the crystal.
The diamond crystal Raman frequency doubling resonator provided by the invention has no space hole burning effect and inner cavity frequency doubling longitudinal mode gain competition effect based on the diamond crystal Raman effect, and the output continuous wave 660nm laser operates at a single frequency.
The continuous wave 330nm sodium star-guiding laser system further comprises a single-pass frequency multiplication module, wherein the single-pass frequency multiplication module is sequentially provided with a focusing lens 4-1 and a second frequency multiplication crystal 4-2, and the focusing lens 4-1 is used for focusing 660nm laser generated by a diamond crystal Raman frequency multiplication resonator; the second frequency doubling crystal 4-2 is barium metaborate crystal, and high transmittance at 660nm and 330nm is required for plating films on the surface of the crystal.
The invention provides an application of a continuous wave 330nm sodium star-guiding laser system in continuous wave 330nm laser preparation, which comprises the following steps:
s1, a continuous wave 1122nm optical fiber Raman laser outputs laser light for continuous light operation, and the laser spectrum linewidth is smaller than the diamond Raman gain linewidth, namely smaller than 45GHz;
s2: the 1122nm laser generated in the step S1 is less than 45GHz, and reverse light is filtered through a space isolator;
s3: inputting 1122nm laser which is less than 45GHz and is obtained in the step S2 into a diamond crystal Raman frequency doubling resonator, and outputting continuous wave 660nm laser which runs at a single frequency based on a diamond crystal Raman effect without a space hole burning effect and an inner cavity frequency doubling longitudinal and transverse gain competition effect;
s4: step S3, the 660nm laser is focused by a focusing lens, and continuous wave 330nm pulse laser resonating with the sodium atom absorption spectrum is obtained by frequency multiplication of a second frequency multiplication crystal;
in the step S1, a continuous wave 1122nm fiber Raman laser 1070nm pump laser operates as a continuous wave, a 1122nm Raman fiber resonant cavity formed by a 1122nm high-reflectivity grating, a section of Raman gain fiber and a 1122nm low-reflectivity grating is injected, 1122nm laser is obtained through Raman oscillation, and 1122nm laser with continuous wave and spectrum width smaller than 45GHz is output after passing through the 1122nm low-reflectivity grating; or in the step S1, 1122nm seed laser is amplified by 1070nm laser in the Raman fiber, and finally continuous wave 1122nm laser with the spectral width smaller than 45GHz is output by a second wavelength division multiplexer.
The invention is based on the diamond crystal Raman technology, adopts a continuous wave 1122nm optical fiber Raman laser to pump a diamond crystal Raman frequency doubling resonator to obtain continuous wave 660nm single-frequency laser, and then realizes continuous wave 330nm laser output through the single-pass frequency doubling technology. The invention uses the high-power continuous wave fiber laser as a pumping source, the Raman gain medium is diamond crystal, and the thermal conductivity is highest in all laser crystals, so that the high-power continuous wave operation can be realized. And the optical fiber laser and the diamond Raman laser utilized in the invention have better beam quality. The invention provides a high-power continuous wave 330nm laser device which is used for a multi-color sodium star-guide self-adaptive optical system and eliminates atmospheric oblique aberration. The invention solves the problem that the direct acquisition of high-power continuous wave 330nm laser is difficult because of the lack of effective laser gain substances in the 330nm wave band.
Example 1: continuous wave 330nm sodium star-guiding laser system and application thereof
Referring to fig. 1-3, fig. 1 is a schematic diagram of a continuous wave 330nm polychromatic sodium star-guiding laser provided by the invention, a continuous wave 1122nm optical fiber raman laser 1 passes through a space isolator 2, enters a diamond crystal raman frequency doubling resonator 3, obtains 660nm laser in a resonant cavity through the action of a diamond crystal in the cavity and a first frequency doubling crystal, and then obtains 330nm pulse laser resonating with a sodium atom absorption spectrum through the action of a single-pass frequency doubling module 4.
FIG. 2 is a schematic diagram of a continuous wave 1122nm fiber Raman laser provided by the invention, which comprises 1070nm pump laser 1-1-1, high-reflectivity fiber grating 1-1-2, one section of Raman gain fiber 1-1-3 and low-reflectivity grating 1-1-4 which are connected in sequence, wherein the 1070nm pump laser operates as continuous wave, and is injected into a 1122nm Raman fiber resonant cavity formed by the 1122nm high-reflectivity grating 1-1-2, one section of Raman gain fiber 1-1-3 and the 1122nm low-reflectivity grating 1-1-4, and 1122nm laser is obtained through Raman oscillation, and the 1122nm laser with the spectral width smaller than 45GHz is output after passing through the 1122nm low-reflectivity grating 1-1-4.
Fig. 3 is a diagram showing a raman frequency doubling resonator of a diamond crystal, which comprises an input coupling mirror 3-1, a diamond crystal 3-2, a first frequency doubling crystal 3-3 and an output coupling mirror 3-4, pump light of 1122nm sequentially passes through the input coupling mirror 3-1, the raman frequency doubling resonator of the diamond crystal is injected, the laser oscillation wavelength of the resonator is 1320nm, the resonator has a high quality factor at 1320nm, the diamond crystal 3-2 provides raman gain, and laser of 660nm is obtained after laser of 1320nm passes through the first frequency doubling crystal 3-3 and is output through the output coupling mirror 3-4.
The surface coating of the diamond crystal 3-2 requires high transmittance at 1070nm, 1320nm and 660 nm;
the surface of the input coupling mirror 3-1 is required to be coated with a film, so that the film has high transmittance at 1070nm, high reflectivity at 1320nm and high reflectivity at 660 nm;
the surface coating of the output coupling mirror 3-4 is required to have high reflectivity at 1070nm, high reflectivity at 1320nm and high transmissivity at 660 nm;
the first frequency doubling crystal 3-3 is a lithium triborate crystal, and high transmittance at 1070nm, 1320nm and 660nm is required for coating the surface of the crystal.
The diamond crystal Raman frequency doubling resonator has no space hole burning effect and inner cavity frequency doubling longitudinal mode gain competition effect based on the diamond crystal Raman effect, and the output continuous wave 660nm laser operates in a single frequency mode.
FIG. 4 shows a single-pass frequency doubling module provided by the invention, which sequentially comprises a focusing lens 4-1 and a second frequency doubling crystal 4-2, wherein the obtained 660nm laser is focused by the focusing lens 4-1, passes through the second frequency doubling crystal 4-2, and finally outputs continuous wave 330nm laser;
the second frequency doubling crystal 4-2 is a barium metaborate crystal, and high transmittance at 660nm and 330nm is required for the surface coating of the crystal.
The continuous wave 330nm sodium star-guiding laser system and the application thereof provided by the invention provide a laser light source which can be used as a multi-color sodium star-guiding self-adaptive optical system, 330nm laser excited sodium atoms can simultaneously generate multi-band fluorescence of 2207nm, 1104nm, 589nm, 330nm and the like, and the multi-color sodium beacon can effectively eliminate atmospheric oblique aberration. Compared with 330nm laser with high peak power pulse, 330nm laser operated by continuous wave has higher average power, more fluorescence photons are returned in unit time, and the peak power of the continuous wave laser is low, thus avoiding nonlinear attenuation effect of atmosphere to the high peak power pulse laser. Therefore, the continuous wave 330nm laser related to the invention has technical advantages and important application value.
Example 2: continuous wave 330nm sodium star-guiding laser system and application thereof
FIG. 5 is a schematic diagram of a continuous wave 1122nm fiber Raman laser provided by the invention, which comprises 1122nm seed laser 1-2-1, a first wavelength division multiplexer 1-2-2, a section of Raman gain fiber 1-2-3, a second wavelength division multiplexer 1-2-4, 1070nm pump laser 1-2-5, 1122nm seed laser 1-2-1 with a spectral width smaller than 45GHz, which are sequentially connected, after passing through the first wavelength division multiplexer 1-2-2, a section of Raman gain fiber 1-2-3 and continuous wave 1070nm pump laser 1-2-5, after passing through the second wavelength division multiplexer 1-2-4, a section of Raman gain fiber 1-2-3 is injected from the back, 1122nm seed laser is amplified in the Raman fiber by 1070nm laser, and finally continuous wave 1122nm laser with a spectral width smaller than 45GHz is output through the second wavelength division multiplexer 1-2-4.
In this embodiment, the 1122nm seed laser 1-2-1 is operated in continuous wave, the spectral width is smaller than 45GHz, the first wavelength division multiplexer 1-2-2 is injected into the section of raman gain fiber 1-2-3, the 1070nm pump laser 1-2-5 is operated in continuous wave, the second wavelength division multiplexer 1-2-4 is injected into the section of raman gain fiber 1-2-3 from the back direction, the 1122nm seed laser 1-2-1 is amplified in the raman fiber 1-2-3 by the 1070nm pump laser 1-2-5, and finally the second wavelength division multiplexer 1-2-4 outputs continuous wave 1122nm laser with spectral width smaller than 45GHz. The invention provides a continuous wave 1122nm fiber Raman laser which utilizes 1122nm seed laser to realize the reverse pumping Raman amplification of 1070nm laser and has the output spectrum width smaller than 45GHz.
Other technical solutions of this embodiment are the same as those of embodiment 1, and are not described here again.
The above detailed description is intended to illustrate the invention and is not intended to limit the invention, but to limit the preferred embodiments of the invention, any modifications, equivalents, improvements, etc. made to the invention within the spirit of the invention and the scope of the claims are within the scope of the invention.
Claims (9)
1. A continuous wave 330nm sodium guide star laser system, characterized by: the laser comprises a continuous wave 1122nm optical fiber Raman laser, a space isolator, a diamond crystal Raman frequency doubling resonator and a single-pass frequency doubling module, wherein the continuous wave 1122nm optical fiber Raman laser outputs laser which runs continuously, the laser is injected into the diamond crystal Raman frequency doubling resonator after passing through the space isolator, the laser with the first Stokes spectral line wavelength 1320nm is obtained through the Raman effect of the diamond crystal in the cavity, meanwhile, the continuous wave single-frequency 660nm laser is generated and output through the second harmonic generation technology of the frequency doubling crystal in the cavity, finally, the continuous wave single-frequency 330nm laser which resonates with the absorption spectral line of sodium atoms is obtained through the single-pass frequency doubling module, the laser spectral linewidth is smaller than the gain linewidth of the diamond Raman, namely smaller than 45GHz, and the frequency doubling crystal in the cavity is the first frequency doubling crystal.
2. The continuous wave 330nm sodium guided star laser system of claim 1, wherein: the continuous wave 1122nm fiber Raman laser comprises 1070nm pump laser, 1122nm high-reflectivity grating, a section of Raman gain fiber and 1122nm low-reflectivity grating, wherein the 1070nm pump laser operates as continuous wave, and is injected into a 1122nm Raman fiber resonant cavity formed by the 1122nm high-reflectivity grating, the section of Raman gain fiber and the 1122nm low-reflectivity grating, and the 1122nm laser with continuous wave and spectrum width smaller than 45GHz is output after passing through the 1122nm low-reflectivity grating.
3. The continuous wave 330nm sodium guided star laser system of claim 1, wherein: the continuous wave 1122nm fiber Raman laser comprises 1122nm seed laser, a first wavelength division multiplexer, a section of Raman gain fiber, a second wavelength division multiplexer and 1070nm pump laser, wherein the 1122nm seed laser is continuous wave operation, the spectral width is smaller than 45GHz, the first wavelength division multiplexer is used for injecting the section of Raman gain fiber, the 1070nm pump laser is continuous wave operation, the second wavelength division multiplexer is used for injecting the section of Raman gain fiber from the rear direction, the 1122nm seed laser is amplified in the Raman fiber by the 1070nm pump laser, and finally the second wavelength division multiplexer is used for outputting continuous wave, and the spectral width is smaller than 45GHz.
4. The continuous wave 330nm sodium guide star laser system of claim 1, wherein the diamond crystal raman double frequency resonator has no space hole burning effect and cavity double frequency longitudinal mode gain competition effect based on the diamond crystal raman effect, and the output continuous wave 660nm laser operates at a single frequency.
5. The continuous wave 330nm sodium guided star laser system of claim 4 wherein: the diamond crystal Raman frequency doubling resonator comprises an input coupling mirror, a diamond crystal, a first frequency doubling crystal and an output coupling mirror;
the laser oscillation wavelength of the diamond crystal Raman frequency doubling resonator is 1320nm, and the resonator has a high quality factor at 1320 nm;
the diamond crystal is used as a Raman gain medium, and the surface coating of the diamond crystal requires high transmittance at 1070nm, 1320nm and 660 nm;
the surface coating of the input coupling mirror requires high transmittance at 1070nm, high reflectivity at 1320nm and high reflectivity at 660 nm;
the surface coating of the output coupling mirror requires high reflectivity at 1070nm, high reflectivity at 1320nm and high transmissivity at 660 nm;
the first frequency doubling crystal is a lithium triborate crystal, and high transmittance at 1070nm, 1320nm and 660nm is required for crystal surface coating.
6. The continuous wave 330nm sodium guided star laser system of claim 1, wherein: the single-pass frequency multiplication module sequentially comprises a focusing lens and a second frequency multiplication crystal, wherein the focusing lens is used for focusing 660nm laser generated by the Raman frequency multiplication resonator of the diamond crystal; the second frequency doubling crystal is barium metaborate crystal, and high transmittance at 660nm and 330nm is required for crystal surface coating.
7. Use of a continuous wave 330nm sodium guide star laser system according to any of claims 1-6 for the production of a continuous wave operated 330nm laser light source.
8. Use of a continuous wave 330nm sodium guided star laser system according to claim 7, wherein:
s1, a continuous wave 1122nm optical fiber Raman laser outputs laser light for continuous light operation, and the laser spectrum linewidth is smaller than the diamond Raman gain linewidth, namely smaller than 45GHz;
s2: the 1122nm laser generated in the step S1 is smaller than 45GHz, and reverse light is filtered through a space isolator;
s3: inputting 1122nm laser which is less than 45GHz and is obtained in the step S2 into a diamond crystal Raman frequency doubling resonator, and outputting continuous wave 660nm laser which runs at a single frequency based on a diamond crystal Raman effect without a space hole burning effect and an inner cavity frequency doubling longitudinal and transverse gain competition effect;
s4: step S3, the 660nm laser is focused by a focusing lens, and then frequency multiplication is carried out by a second frequency multiplication crystal to obtain continuous wave 330nm pulse laser resonating with the sodium atom absorption spectrum;
the step S1 utilizes 1070nm continuous pumping light to pass through a resonant cavity formed by 1122nm high-reflectivity grating, a section of Raman gain fiber and 1122nm low-reflectivity grating, and outputs laser with spectral width smaller than 45GHz.
9. Use of a continuous wave 330nm sodium guided star laser system according to claim 8, wherein: and in the step S1, 1122nm seed laser is subjected to 1070nm laser reverse pumping Raman amplification, so that continuous waves with the spectral width smaller than 45GHz are output, and 1122nm laser with the spectral width smaller than 45GHz is output.
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