CN114976828A - Continuous wave 330nm sodium guide star laser system and application thereof - Google Patents
Continuous wave 330nm sodium guide star laser system and application thereof Download PDFInfo
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- 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
- H01S3/1086—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 scattering effects, e.g. Raman or Brillouin effect
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- 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
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Abstract
The invention relates to a continuous wave 330nm sodium guide star laser system and application thereof, which 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, first Stokes spectral line wavelength 1320nm laser is obtained through the intracavity diamond crystal Raman effect, meanwhile, continuous wave single-frequency 660nm laser is generated and output through the intracavity frequency doubling crystal second harmonic generation technology, and finally, the continuous wave single-frequency 330nm laser which is in resonance with a sodium atom absorption spectral line is obtained through the single-pass frequency doubling module. The continuous wave 330nm sodium guide star laser system and the application thereof realize laser output of continuous wave, single frequency 330nm high average power and high beam quality.
Description
Technical Field
The invention belongs to the technical field of crystal Raman lasers, and particularly relates to a continuous wave 330nm sodium guide star laser system and application thereof.
Background
In an adaptive optical system, laser is used for exciting atoms of a sodium layer to obtain high-brightness beacon light, wavefront distortion caused by atmospheric disturbance is compensated, and the resolution of a ground-based optical telescope can be greatly improved. At present, a monochromatic 589nm laser source is a main technical scheme of a sodium guide star laser and is widely used, namely, the 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 atmosphere, an adaptive optical system detects and compensates wavefront distortion caused by atmospheric disturbance, and finally observation resolution close to a diffraction limit is achieved. However, the sodium beacon star based on monochromatic laser has an atmospheric oblique aberration which cannot be eliminated, and the performance of the sodium guide star adaptive optical system is affected. Researches show that 330nm laser can also generate resonance with sodium atoms, and compared with 589nm monochromatic laser excitation, the 330nm laser can excite the sodium atoms to generate multi-band fluorescence of 2207nm, 1104nm, 589nm, 330nm and the like, and the multi-color sodium beacon can effectively eliminate atmospheric oblique aberration. Therefore, the multicolor sodium guide star laser light source based on the 330nm laser has important application and scientific research values. Compared with the high peak power pulse 330nm laser, the continuous wave running 330nm laser has higher average power, the number density of the excited fluorescence photons in unit time is high, the acquisition by a telescope is facilitated, and the nonlinear attenuation effect of atmosphere on the high peak power pulse laser is avoided.
Chinese patent application CN 106299997 a discloses a solid laser source suitable for generating multi-color sodium guide star, a 330nm laser related patent, which discloses that a semiconductor pump light source is used to generate laser as pulse laser, the frequency of the laser with first wavelength and the laser with second wavelength are doubled by a frequency doubling module and a frequency quadrupler 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 the serious thermal effect of the semiconductor laser gain medium, and cannot realize high-power continuous wave output, and the pumping source is a semiconductor pumping light source, and the semiconductor is used as a pump, so that the quality of the generated laser beam is poor.
Several methods for obtaining 330nm lasers were taught in "multi-color laser guide using a single laser at 330 nm" published by "adaptive optics evolution II" on 28.6.2006: 1. nd-doped YAG or YLF gain media have strong laser emission spectra at 1.3 μm. With quadruple frequency, a 330.3nm laser can be obtained, but limited by the severe thermal effect of the gain medium, which is also a pulsed laser output. 2. A532 nm Nd: YAG laser was used with an 870nm Ti: the Sapphire laser sum frequency produces a 330.3nm laser, which is very complex and expensive, and is also a pulsed laser output. (see in detail: Jean-Paul Pique, Ioana C. Moldovan, Vincent Fesquet, Hugues Guillet de Chatellus, Faben Marc, "Polychromatic laser guide using a single laser at 330nm," Proc. SPIE 6272, Advances in Adaptive Optics II,62723D (28June 2006); https:// doi. org/10.1117/12.692350)
The Nd doped YAG or YLF gain medium has strong laser emission spectrum at 1.3 μm, and 330.3nm laser can be obtained by quadruple frequency, but the laser is also pulse laser output due to the serious thermal effect of the gain medium.
Wherein, a 532nm Nd: YAG laser and 870nm Ti: the Sapphire laser sum frequency produces a 330.3nm laser, which is very complex and expensive, and is also a pulsed laser output.
Disclosure of Invention
The first purpose of the present invention is to provide a continuous wave 330nm sod guided star laser system, which realizes continuous wave, single frequency 330nm high average power and high beam quality laser output, aiming at the defects existing in the prior art.
Therefore, the above purpose of the invention is realized by the following technical scheme:
the utility model provides a continuous wave 330nm sodium guide star laser instrument system, includes continuous wave 1122nm optic fibre raman laser instrument, space isolator, diamond crystal raman doubling of frequency syntonizer, one-way doubling of frequency module, continuous wave 1122nm optic fibre raman laser instrument, process the space isolator after, pour into diamond crystal raman doubling of frequency syntonizer, through intracavity diamond crystal raman effect, obtain first stokes spectral line wavelength 1320nm laser, through intracavity doubling of frequency crystal second harmonic generation technique simultaneously, produce and output continuous wave single frequency 660nm laser, finally pass through the one-way doubling of frequency module obtain with sodium atom absorption spectral line resonance's continuous wave single frequency 330nm laser.
Further, the continuous wave 1122nm fiber Raman laser outputs laser which runs as continuous light, and the laser spectrum line width is smaller than the diamond Raman gain line width, namely smaller than 45 GHz.
Further, the continuous wave 1122nm fiber Raman laser comprises 1070nm pump laser, an 1122nm high-reflectivity grating, a section of Raman gain fiber and an 1122nm low-reflectivity grating, wherein the 1070nm pump laser operates in a continuous wave mode, is injected into an 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 outputs the continuous wave 1122nm laser with the spectral width smaller than 45GHz after passing through the 1122nm low-reflectivity grating.
Further, continuous wave 1122nm optic fibre raman laser, it includes 1122nm seed laser, first wavelength division multiplexer, a section of raman gain optic fibre, second wavelength division multiplexer and 1070nm pump laser, 1122nm seed laser be continuous wave operation, its spectral width is less than 45GHz, through first wavelength division multiplexer after, pour into one section of raman gain optic fibre, 1070nm pump laser be continuous wave operation, through second wavelength division multiplexer after, pour into one section of raman gain optic fibre from the back, 1122nm seed laser is through 1070nm pump laser amplification in raman optic fibre, finally through second wavelength division multiplexer output continuous wave, 1122nm laser that spectral width is less than 45 GHz.
Further, based on the Raman effect of the diamond crystal without space hole burning effect and the intracavity frequency doubling longitudinal mode gain competition effect, the output continuous wave 660nm laser operates in single frequency.
Further, the diamond crystal Raman frequency doubling resonator comprises an input coupling mirror, a diamond crystal, a frequency doubling crystal and an output coupling mirror;
or 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;
or, the diamond crystal is used as a Raman gain medium, and the surface coating of the diamond crystal requires high transmission rate at 1070nm, 1320nm and 660 nm;
or, the surface of the input coupling mirror is required to be coated with a film, wherein the transmittance is high at 1070nm, the reflectivity is high at 1320nm, and the reflectivity is high at 660 nm;
or, the surface of the output coupling mirror is required to be coated with high reflectivity at 1070nm, high reflectivity at 1320nm and high transmittance at 660 nm;
or the frequency doubling crystal is a lithium triborate crystal, and the surface coating of the crystal requires high transmission rates of 1070nm, 1320nm and 660 nm.
Further, the single-pass frequency doubling module sequentially comprises a focusing lens and a frequency doubling crystal, wherein the focusing lens is used for focusing 660nm laser generated by the diamond crystal Raman frequency doubling resonator according to claims 1 and 5; the frequency doubling crystal 4-2 is a barium metaborate crystal, and the coating film on the surface of the crystal requires high transmittance at 660nm and 330 nm.
It is a further object of the present invention to provide a continuous wave 330nm Na-guide laser system that addresses the deficiencies in the prior art.
Therefore, the above purpose of the invention is realized by the following technical scheme:
use of a continuous wave 330nm sodium guide star laser system for the production of a continuous wave operating 330nm laser source.
Further, the method comprises the following steps:
s1, outputting laser by a continuous wave 1122nm fiber Raman laser, wherein the laser spectrum line width is smaller than the line width of the diamond Raman gain line, namely smaller than 45 GHz;
s2: the 1122nm laser light with the wavelength less than 45GHz generated in the step S1 is filtered through a space isolator to form reverse light;
s3: inputting 1122nm laser of which the frequency is less than 45GHz and which is obtained in the step S2, and outputting single-frequency continuous wave 660nm laser based on the Raman effect of the diamond crystal without space hole burning effect and the intracavity frequency doubling vertical and horizontal gain competition effect;
s4: focusing the 660nm laser obtained in the step S3 through a focusing lens, and obtaining a pulse laser with continuous wave of 330nm which resonates with a sodium atom absorption spectral line through frequency doubling crystal frequency doubling;
in the step S1, 1070nm continuous pump light passes through a resonant cavity formed by an 1122nm high-reflectivity grating, a section of raman gain fiber and an 1122nm low-reflectivity grating, and a laser with a spectral width smaller than 45GHz is output; or, in the step S1, the 1122nm seed laser is subjected to 1070nm laser reverse pumping raman amplification, so as to realize continuous wave 1122nm laser with the output spectral width smaller than 45 GHz.
The invention provides a continuous wave 330nm multicolor sodium guide star laser system, which realizes the laser output of continuous wave and single frequency 330nm with high average power and high beam quality, can be used as a laser light source of a multicolor sodium guide star adaptive optical system, can simultaneously generate multi-band fluorescence of 2207nm, 1104nm, 589nm, 330nm and the like by exciting sodium atoms by 330nm laser, and can effectively eliminate atmospheric oblique aberration by the multicolor sodium beacon. Compared with the high-peak-power pulse 330nm laser, the continuous-wave running 330nm laser has higher average power, more returned fluorescent photons are in unit time, the peak power of the continuous-wave laser is low, and the nonlinear attenuation effect of atmosphere on the high-peak-power pulse laser is avoided. Therefore, the continuous wave 330nm laser has the technical advantages and important application value.
Drawings
FIG. 1 is a schematic diagram of a continuous wave 330nm multicolor sodium guide star laser system provided in embodiment 1 of the present invention;
fig. 2 is a schematic diagram of a continuous wave 1122nm fiber raman laser that outputs a laser having a spectral width smaller than 45GHz and is formed by passing 1070nm continuous pump light through a resonant cavity formed by an 1122nm high-reflectivity grating, a section of raman gain fiber, and an 1122nm low-reflectivity grating according to embodiment 1 of the present invention;
fig. 3 is a schematic diagram of a diamond crystal raman frequency doubling resonator provided in embodiment 1 of the present invention;
fig. 4 is a schematic diagram of a single-pass frequency doubling module according to embodiment 1 of the present invention;
FIG. 5 is a schematic diagram of a continuous wave 1122nm fiber Raman laser with a spectral width of less than 45GHz, which is implemented by performing 1070nm laser reverse pumping Raman amplification on 1122nm seed laser provided by the present invention;
in the figure, a continuous wave 1122nm fiber Raman laser 1; 1070nm pump laser 1-1-1; 1122nm high-reflectivity grating 1-1-2; 1-1-3 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; 3-3 of frequency doubling crystals; an output coupling mirror 3-4; a single-pass frequency doubling module 4; a focusing lens 4-1; frequency doubling crystal 4-2.
Detailed Description
The invention is described in further detail with reference to the figures and specific embodiments.
The invention relates to a continuous wave 330nm sodium guide star 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 the wavelength of 1320nm of a first Stokes spectral line is obtained through the Raman effect of an intracavity diamond crystal, meanwhile, continuous wave single-frequency 660nm laser is generated and output through the intracavity frequency doubling crystal second harmonic generation technology, and finally, the continuous wave single-frequency 330nm laser which is in resonance 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 which runs by continuous light, and the laser spectrum line width is smaller than the diamond Raman gain line width, namely smaller than 45 GHz.
In the invention, the continuous wave 1122nm fiber Raman laser comprises 1070nm pump laser 1-1-1, 1122nm high-reflectivity grating 1-1-2, a section of Raman gain fiber 1-1-3 and 1122nm low-reflectivity grating 1-1-4, wherein the 1070nm pump laser 1-1-1 operates in a continuous wave mode, an 1122nm Raman fiber resonant cavity consisting of the 1122nm high-reflectivity grating 1-1-2, the section of Raman gain fiber 1-1-3 and the 1122nm low-reflectivity grating 1-1-4 is injected, and the 1122nm laser with a continuous wave and a 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 pump light to pass through a resonant cavity formed by an 1122nm high-reflectivity grating, a section of Raman gain fiber and an 1122nm low-reflectivity grating to output laser with the spectral width smaller than 45 GHz.
The diamond crystal Raman frequency doubling resonator comprises an input coupling mirror 3-1, a diamond crystal 3-2, a 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 coating film on the surface of the diamond crystal 3-2 requires high transmission rates of 1070nm, 1320nm and 660 nm;
the surface of the input coupling mirror 3-1 is required to be coated with films, and the transmittance is high at 1070nm, the reflectivity is high at 1320nm, and the reflectivity is high at 660 nm;
the coating film on the surface of the output coupling mirror 3-4 requires high reflectivity at 1070nm, high reflectivity at 1320nm and high transmittance at 660 nm;
the frequency doubling crystal 3-3 is a lithium triborate crystal, and the surface coating of the crystal requires high transmittance at 1070nm, 1320nm and 660 nm.
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 runs at a single frequency.
The continuous wave 330nm sodium guide star laser system also comprises a single-pass frequency doubling module, wherein the single-pass frequency doubling module is sequentially provided with a focusing lens 4-1 and a frequency doubling crystal 4-2, and the focusing lens 4-1 is used for focusing 660nm laser generated by a diamond crystal Raman frequency doubling resonator; the frequency doubling crystal 4-2 is a barium metaborate crystal, and the coating film on the surface of the crystal requires high transmittance at 660nm and 330 nm.
The invention provides an application of a continuous wave 330nm sodium guide star laser system in the preparation of a continuous wave 330nm laser, which comprises the following steps:
s1, outputting laser by a continuous wave 1122nm fiber Raman laser, wherein the laser spectrum line width is smaller than the diamantan Raman gain line width, namely smaller than 45 GHz;
s2: the 1122nm laser light with the wavelength less than 45GHz generated in the step S1 is filtered through a spatial isolator to obtain reverse light;
s3: inputting 1122nm laser of which the frequency is less than 45GHz and which is obtained in the step S2, and outputting single-frequency continuous wave 660nm laser based on the Raman effect of the diamond crystal without space hole burning effect and the intracavity frequency doubling vertical and horizontal gain competition effect;
s4: focusing the 660nm laser obtained in the step S3 through a focusing lens, and obtaining 330nm pulse laser of continuous wave resonant with the absorption spectrum line of sodium atoms through frequency doubling crystal frequency doubling;
in step S1, the continuous wave 1122nm fiber raman laser 1070nm pump laser operates as a continuous wave, and is injected into an 1122nm raman fiber resonant cavity formed by an 1122nm high-reflectivity grating, a section of raman gain fiber and an 1122nm low-reflectivity grating, and obtains an 1122nm laser through raman oscillation, and the 1122nm laser with a continuous wave and a spectral width smaller than 45GHz is output through the 1122nm low-reflectivity grating; or in step S1, the 1122nm seed laser is amplified by 1070nm laser in the raman fiber, and finally the 1122nm laser with continuous wave and spectral width less than 45GHz is output by the second wavelength division multiplexer.
The invention is based on a diamond crystal Raman technology, adopts a continuous wave 1122nm fiber Raman laser to pump a diamond crystal Raman frequency doubling resonator to obtain a continuous wave 660nm single-frequency laser, and then realizes the output of the continuous wave 330nm laser through a single-pass frequency doubling technology. The invention uses high power continuous wave fiber laser as pump source, the Raman gain medium is diamond crystal, the heat conductivity is the highest of all laser crystals, so it can realize high power continuous wave operation. The quality of the beams of the fiber laser and the diamond Raman laser utilized in the invention is better. The invention provides a high-power continuous wave 330nm laser device which is used for a multicolor sodium guide star 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 the 330nm wave band is lack of effective laser gain substances.
Example 1: continuous wave 330nm sodium guide star laser system and application thereof
Referring to fig. 1-3, fig. 1 is a schematic diagram of a continuous wave 330nm multi-color sodium guide laser provided by the present invention, a continuous wave 1122nm fiber raman laser 1 enters a diamond crystal raman frequency doubling resonator 3 through a spatial isolator 2, 660nm laser is obtained in the resonant cavity through the action of the diamond crystal and the frequency doubling crystal in the cavity, and then 330nm pulse laser resonating with a sodium atom absorption line is obtained through the frequency doubling by 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 present invention, which includes a 1070nm pump laser 1-1-1, a high reflectivity fiber grating 1-1-2, a segment of Raman gain fiber 1-1-3, and a low reflectivity grating 1-1-4, the serial line width of which is less than 45GHz, connected in sequence, operating as a continuous wave, injecting an 1122nm Raman fiber resonant cavity composed of the 1122nm high reflectivity grating 1-1-2, the segment of Raman gain fiber 1-1-3, and the 1122nm low reflectivity grating 1-1-4, obtaining 1122nm laser through Raman oscillation, outputting a continuous wave spectrum after passing through the 1122nm low reflectivity grating 1-1-4, and outputting the 1122nm laser with a width of less than 45 GHz.
FIG. 3 shows a Raman frequency doubling resonator of a diamond crystal, which includes an input coupling mirror 3-1, a diamond crystal 3-2, a frequency doubling crystal 3-3, and an output coupling mirror 3-4, 1122nm pump light sequentially passing through the input coupling mirror 3-1 and being injected into the Raman frequency doubling resonator of the diamond crystal, 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 the 1320nm laser passes through the frequency doubling crystal 3-3 to obtain 660nm laser, which is output through the output coupling mirror 3-4.
The surface of the diamond crystal 3-2 is coated with a film with 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, and the transmission rate is high at 1070nm, the reflectivity is high at 1320nm, and the reflectivity is high at 660 nm;
the surface of the output coupling mirror 3-4 is required to be coated with films, and the reflectivity is high at 1070nm, the reflectivity is high at 1320nm, and the transmissivity is high at 660 nm;
the frequency doubling crystal 3-3 is a lithium triborate crystal, and the surface coating of the crystal requires high transmittance at 1070nm, 1320nm and 660 nm.
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.
FIG. 4 is a single-pass frequency doubling module provided by the present invention, which sequentially includes a focusing lens 4-1 and a frequency doubling crystal 4-2, wherein the obtained 660nm laser is focused by the focusing lens 4-1, passes through the frequency doubling crystal 4-2, and finally outputs a continuous wave 330nm laser;
the frequency doubling crystal 4-2 is a barium metaborate crystal, and the coating film on the surface of the crystal requires high transmittance at 660nm and 330 nm.
The continuous wave 330nm sodium guide star laser system and the application thereof provided by the invention provide a laser light source which can be used as a multicolor sodium guide star adaptive optical system, and 330nm laser excited sodium atoms can simultaneously generate multiband fluorescence of 2207nm, 1104nm, 589nm, 330nm and the like, and the multicolor sodium beacon can effectively eliminate atmospheric oblique aberration. Compared with the high-peak-power pulse 330nm laser, the continuous-wave running 330nm laser has higher average power, more returned fluorescent photons are in unit time, the peak power of the continuous-wave laser is low, and the nonlinear attenuation effect of atmosphere on the high-peak-power pulse laser is avoided. Therefore, the continuous wave 330nm laser has technical advantages and important application value.
Example 2: continuous wave 330nm sodium guide star laser system and application thereof
FIG. 5 is a schematic view of a continuous wave 1122nm fiber Raman laser provided by the present 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, and 1122nm seed laser 1-2-1 with a spectral width less than 45GHz, which are connected in sequence, and injected into a section of Raman gain fiber 1-2-3 after passing through the first wavelength division multiplexer 1-2-2, and the continuous wave 1070nm pump laser 1-2-5, which is injected into a section of Raman gain fiber 1-2-3 after passing through the second wavelength division multiplexer 1-2-4, and the 1122nm seed laser is amplified by the Raman fiber 1070nm laser in the Raman fiber, finally, 1122nm laser with continuous wave and spectral width less than 45GHz is output by the second wavelength division multiplexer 1-2-4.
In this embodiment, the 1122nm seed laser 1-2-1 operates with continuous wave, and has a spectral width of less than 45GHz, and is injected into the section of raman gain fiber 1-2-3 after passing through the first wavelength division multiplexer 1-2-2, the 1070nm pump laser 1-2-5 operates with continuous wave, and is injected into the section of raman gain fiber 1-2-3 and 1122nm seed laser 1-2-1 from the rear direction after passing through the second wavelength division multiplexer 1-2-4, and is amplified by the 1070nm pump laser 1-2-5 in the raman fiber 1-2-3, and finally, the 1122nm laser with a spectral width of less than 45GHz is output by the second wavelength division multiplexer 1-2-4. The invention provides a continuous wave 1122nm fiber Raman laser which utilizes 1122nm seed laser to realize output of continuous wave 1122nm fiber Raman laser with spectral width less than 45GHz after 1070nm laser reverse pumping Raman amplification.
Other technical solutions of this embodiment are the same as those of embodiment 1, and are not described herein again.
The above-mentioned embodiments are intended to illustrate the invention, but not to limit the invention, and any modifications, equivalents, improvements and the like made within the spirit of the invention and the scope of the claims are included in the scope of the invention.
Claims (9)
1. A continuous wave 330nm sodium guide star laser system is characterized in that: including continuous wave 1122nm optic fibre raman laser, space isolator, diamond crystal raman doubling resonator, single-pass frequency doubling module, continuous wave 1122nm optic fibre raman laser, output laser is continuous light operation, pass through the space isolator after, pour into diamond crystal raman doubling resonator, through intracavity diamond crystal raman effect, obtain first stokes spectral line wavelength 1320nm laser, simultaneously through intracavity frequency doubling crystal second harmonic generation technique, produce and output continuous wave single-frequency 660nm laser, pass through finally the single-pass frequency doubling module obtain with sodium atom absorption spectral line resonance's continuous wave single-frequency 330nm laser, laser spectral line width is less than diamond raman gain line width, is less than 45GHz promptly.
2. The continuous wave 330nm sodium guide star laser system of claim 1 wherein: the continuous wave 1122nm fiber Raman laser comprises 1070nm pump laser, an 1122nm high-reflectivity grating, a section of Raman gain fiber and an 1122nm low-reflectivity grating, wherein the 1070nm pump laser operates in a continuous wave mode, is injected into an 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 outputs the continuous wave 1122nm laser with the spectral width smaller than 45GHz after passing through the 1122nm low-reflectivity grating.
3. The continuous wave 330nm sodium guide star laser system of claim 1 wherein: continuous wave 1122nm optic fibre raman laser includes 1122nm seed laser, first wavelength division multiplexer, a section of raman gain optic fibre, second wavelength division multiplexer and 1070nm pump laser, 1122nm seed laser be continuous wave operation, its spectral width is less than 45GHz, the warp first wavelength division multiplexer after, pour into a section of raman gain optic fibre, 1070nm pump laser be continuous wave operation, the warp second wavelength division multiplexer after, pour into from the back into a section of raman gain optic fibre, 1122nm seed laser is through 1070nm pump laser amplification in raman optic fibre, finally the warp second wavelength division multiplexer output continuous wave, 1122nm laser that spectral width is less than 45 GHz.
4. The continuous wave 330nm sodium guide star laser system of claim 1, wherein the diamond crystal raman doubling resonator outputs continuous wave 660nm laser at a single frequency based on the diamond crystal raman effect no-space hole burning effect and the intracavity frequency doubling longitudinal mode gain competition effect.
5. The continuous wave 330nm sodium guide star laser system of claim 4 in which: the diamond crystal Raman frequency doubling resonator comprises an input coupling mirror, a diamond crystal, a frequency doubling crystal and an output coupling mirror;
or 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;
or, the diamond crystal is used as a Raman gain medium, and the surface coating of the diamond crystal requires high transmission rate at 1070nm, 1320nm and 660 nm;
or, the surface of the input coupling mirror is required to be coated with a film, wherein the transmittance is high at 1070nm, the reflectivity is high at 1320nm, and the reflectivity is high at 660 nm;
or, the surface of the output coupling mirror is required to be coated with high reflectivity at 1070nm, high reflectivity at 1320nm and high transmittance at 660 nm;
or the frequency doubling crystal is a lithium triborate crystal, and the surface coating of the crystal requires high transmittance at 1070nm, 1320nm and 660 nm.
6. The continuous wave 330nm sodium guide star laser system of claim 1 wherein: the single-pass frequency doubling module sequentially comprises a focusing lens and a frequency doubling crystal, wherein the focusing lens is used for focusing 660nm laser generated by the diamond crystal Raman frequency doubling resonator; the frequency doubling crystal is a barium metaborate crystal, and the coating film on the surface of the crystal requires high transmittance at 660nm and 330 nm.
7. Use of a continuous wave 330nm sodium guide star laser system according to any of claims 1-6 in the production of a continuous wave operated 330nm laser light source.
8. The use of a continuous wave 330nm sodium guide star laser system as claimed in claim 7 wherein:
s1, outputting laser by a continuous wave 1122nm fiber Raman laser, wherein the laser spectrum line width is smaller than the line width of the diamond Raman gain line, namely smaller than 45 GHz;
s2: the 1122nm laser light with the wavelength less than 45GHz generated in the step S1 is filtered through a space isolator to form reverse light;
s3: inputting 1122nm laser of which the frequency is less than 45GHz and which is obtained in the step S2, and outputting single-frequency continuous wave 660nm laser based on the Raman effect of the diamond crystal without space hole burning effect and the intracavity frequency doubling vertical and horizontal gain competition effect;
s4: focusing the 660nm laser obtained in the step S3 through a focusing lens, and obtaining a pulse laser with continuous wave of 330nm which resonates with a sodium atom absorption spectral line through frequency doubling crystal frequency doubling;
in step S1, 1070nm continuous pump light passes through a resonant cavity formed by an 1122nm high-reflectivity grating, a section of raman gain fiber, and an 1122nm low-reflectivity grating, and a laser with a spectral width smaller than 45GHz is output.
9. The use of a continuous wave 330nm sodium guide star laser system as claimed in claim 8 wherein: and S1, selecting 1122nm seed laser, performing 1070nm laser reverse pumping Raman amplification to realize output of continuous waves with spectral width smaller than 45GHz, and outputting the continuous waves and 1122nm laser with spectral width smaller than 45 GHz.
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| US20190280456A1 (en) * | 2016-09-22 | 2019-09-12 | Macquarie University | Cascaded, long pulse and continuous wave raman lasers |
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| WO2011075780A1 (en) * | 2009-12-22 | 2011-06-30 | Macquarie University | Ultrafast raman laser systems and methods of operation |
| US20160013608A1 (en) * | 2013-03-07 | 2016-01-14 | William KRUPKE | Ultraviolet Triply-Optically-Pumped Atomic Lasers (TOPAL) |
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