CN106253046A - All optical fibre structure mid-infrared gas cascade Ramar laser - Google Patents
All optical fibre structure mid-infrared gas cascade Ramar laser Download PDFInfo
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- CN106253046A CN106253046A CN201610820553.0A CN201610820553A CN106253046A CN 106253046 A CN106253046 A CN 106253046A CN 201610820553 A CN201610820553 A CN 201610820553A CN 106253046 A CN106253046 A CN 106253046A
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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
- H01S3/30—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range using scattering effects, e.g. stimulated Brillouin or Raman effects
- H01S3/302—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range using scattering effects, e.g. stimulated Brillouin or Raman effects in an optical fibre
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Abstract
The invention discloses a kind of all optical fibre structure mid-infrared gas cascade Ramar laser, Near-infrared Tunable optical-fiber laser pumping source including welding successively, the real core fibre of input, antiresonance hollow-core fiber and the real core fibre of output, antiresonance hollow-core fiber is filled with two kinds of Raman gain gases making pump light generation stimulated Raman scattering generation first order raman laser and the second level raman laser making first order raman laser generation stimulated Raman scattering produce middle-infrared band respectively, the second input Bragg grating of the first input Bragg grating and the reflection first order raman laser having reflection second level raman laser is inscribed on the real core fibre of input, the second output Bragg grating of the first output Bragg grating and the fractional transmission second level raman laser having reflection first order raman laser is inscribed on the real core fibre of output.This all optical fibre structure mid-infrared gas cascade Ramar laser has the advantages such as compact conformation, stable performance, narrow linewidth, tunable, efficiency is high, good beam quality.
Description
Technical field
The present invention relates to laser generation device technical field, be specifically related to a kind of all optical fibre structure mid-infrared gas cascade and draw
Graceful laser instrument.
Background technology
Middle-infrared band is positioned at atmospheric window, wide in field application such as remote sensing, laser radar, communication and military affairs
General.The laser instrument realizing middle-infrared band output at present mainly has QCL, electronic vibration solid state laser, beche-de-mer without spike
Amount agitator and optical fiber laser etc..Wherein, QCL is more in running hours heat production, and it is excited district
Territory is bigger, it is difficult to realize high power single-mode output;Electronic vibration solid state laser can realize 2-5 μm and efficiently export, but hot
Lens effect limits the raising of its power;The tunable mid-infrared that optical parametric oscillator can realize several watts of power levels is defeated
Go out, but pumping source live width and polarization state are required higher by it;The fluoride fiber laser instrument mixing holmium at present can realize 3-4
μm laser exports, but power level and Slop efficiency are the most relatively low, and wavelength is expanded to more long wave direction and be there is also bigger difficulty in addition.
Compared with solid state laser and doping solid core fibres laser instrument, the competitive nonlinear effect threshold value of gas laser is high, light
Damage threshold is high, has potential advantages on beam quality and power level.Gas stimulated Raman scattering gain coefficient is high, frequently
Shifting scope is big, medium selects flexibly, from 1963 by reported first since of great interest, be by optical maser wavelength and open up
The effective means of exhibition.But when realizing gas stimulated Raman scattering in free space EFFECTIVE RANGE to be limited to Rayleigh long
Degree, its pumping threshold is higher, and can produce and much compete Raman line.But realize in hollow-core fiber gas be excited draw
Graceful scattering produces mid-infrared laser then can overcome above-mentioned deficiency.
Summary of the invention
The technical problem to be solved in the present invention is the deficiency overcoming prior art to exist, it is provided that a kind of compact conformation, performance
Stable, narrow linewidth, tunable, Threshold pumped power, high transformation efficiency, all optical fibre structure mid-infrared of good beam quality can be reduced
Gas cascade Ramar laser.
For solve above-mentioned technical problem, the present invention by the following technical solutions:
A kind of all optical fibre structure mid-infrared gas cascade Ramar laser, including Near-infrared Tunable optical-fiber laser pumping
Source, antiresonance hollow-core fiber, the real core fibre of input and the real core fibre of output, the two ends of described input reality core fibre are respectively with the reddest
The output tail optical fiber of outer tunable fiber laser pumping source and one end welding of antiresonance hollow-core fiber, described antiresonance hollow-core fiber
Other end core fibre welding real with output;
In described antiresonance hollow-core fiber, mixing is filled with two or more Raman gain gas, at least one of which Raman gain
Gas makes pump light generation stimulated Raman scattering produce first order raman laser, and remaining Raman gain gas makes first order Raman swash
Light generation stimulated Raman scattering produces the second level raman laser of middle-infrared band;
Described antiresonance hollow-core fiber is at pumping laser wave band, first order raman laser wave band, second level raman laser ripple
Loss<0.5dB/m, and in the loss of other wave band>5dB/m of section;
The described real core fibre of input is inscribed has the second level raman laser to middle-infrared band to form the first defeated of high reflection
Enter Bragg grating and first order raman laser is formed the second input Bragg grating of high reflection, described first input Bradley
The peak reflectivity of lattice grating and the second input Bragg grating is all higher than 95%;The real core fibre of described output is inscribed to be had first
Level raman laser forms the first output Bragg grating of high reflection and anti-to the second level raman laser part of middle-infrared band
The the second output Bragg grating penetrated, the reflectance of first order raman laser is more than by described first output Bragg grating
95%, described second output Bragg grating is 10%~90% to the absorbance of the second level raman laser of middle-infrared band.
Above-mentioned all optical fibre structure mid-infrared gas cascade Ramar laser, it is preferred that described second input Prague light
Grid are between the first input Bragg grating and antiresonance hollow-core fiber, and it is defeated that described first output Bragg grating is positioned at second
Go out between Bragg grating and antiresonance hollow-core fiber.
Above-mentioned all optical fibre structure mid-infrared gas cascade Ramar laser, it is preferred that described input reality core fibre and defeated
Go out the real core fibre loss to the second level raman laser of described pump light, first order raman laser and middle-infrared band
<0.5dB/m。
Above-mentioned all optical fibre structure mid-infrared gas cascade Ramar laser, it is preferred that in described antiresonance hollow-core fiber
Two or more Raman gain gases include hydrogen and more than one alkanes gases, described alkanes gas includes methane, second
Alkane, propane, butane and ethylene.
The principle of the present invention is: antiresonance hollow-core fiber can provide the ring of near ideal for gas stimulated Raman scattering
Border, pump light can constrain in the fibre core of micron dimension by effectively, substantially increase pump intensity and useful effect away from
From, and can be by rationally selecting pumping wavelength and Raman gain gas, the loss spectrum of design antiresonance hollow-core fiber
Control the actual gain of each Raman signal, the two is combined composition optical fibre gas laser device and realizes mid-infrared laser output.By
Raman frequency shift in single gas is limited in scope, and is not enough to 1 common micron waveband near-infrared pump light frequency displacement to mid-infrared
Wave band, therefore can be filled with two or more gas in one section of hollow-core fiber simultaneously, and pump light acts on one of which gas
And occur stimulated Raman scattering to carry out shifting on a wavelength, produce first order raman laser, first order raman laser and other
Planting gas interaction occurs excited Raman scattered carrying out again to move on a wavelength, and the second level Raman of generation middle-infrared band is sharp
Light.Or realize moving on wavelength by more stimulated Raman scattering, produce mid-infrared laser.By appropriate design hollow light
Fine transmission belt, can compete the generation of raman laser so that the generation of mid-infrared laser reaches relatively during effectively suppressing this
High transformation efficiency.
Compared with prior art, it is an advantage of the current invention that:
1, all optical fibre structure mid-infrared gas of the present invention cascade Ramar laser realizes the tunable of all optical fibre structure first
Middle infrared laser so that the tunable high-power mid-infrared light source developing compact conformation stable is possibly realized;
2, all optical fibre structure mid-infrared gas of the present invention cascade Ramar laser make use of the cascade of two kinds of gases to be subject to simultaneously
Swash Raman scattering, be a kind of new equipment being produced mid-infrared laser by common near-infrared pumping laser, owing to have employed all-fiber
Structure, has that optical fiber laser structure is compact, steady performance;
3, present invention utilizes in the fibre core that pump light is constrained in micron dimension by antiresonance hollow-core fiber effectively, significantly
Improve pump intensity and EFFECTIVE RANGE, enhance the action intensity of pump light and Raman gain gas;Utilize biography simultaneously
Pumping wavelength and two-stage level raman laser wavelength transmission are lost low, to it by the antiresonance hollow-core fiber of transmission loss spectrum particular design
The feature that its band transmission loss is high, effectively inhibits competition raman laser, improves conversion efficiency;
4, the present invention forms the resonator cavity of first order raman laser by design fiber grating, and first order raman laser is at light
The most fully and the second Raman gain gas effect produces the second of middle-infrared band to form resonance under the multiple reflections effect of grid
Level raman laser, improves transformation efficiency;The resonance of the second level raman laser of design fiber grating formation middle-infrared band simultaneously
Chamber, can be by the coupling output of a part of second level raman laser, and another part is formed humorous under the multiple reflections effect of grating
Shake, to reduce pumping threshold;
5, present invention incorporates gas laser output height, damage threshold nonlinear effect threshold value high, competitive height
, stable performance compact with optical fiber laser structure, good beam quality, conversion efficiency advantages of higher, with existing mid-infrared laser
Technological means is compared, and has bigger potential advantages.
Accompanying drawing explanation
Fig. 1 is the structural representation of all optical fibre structure mid-infrared gas cascade Ramar laser.
Fig. 2 is icecream-type antiresonance hollow-core fiber cross sectional Scanning Electron microgram.
Fig. 3 is free boundary type antiresonance hollow-core fiber cross sectional Scanning Electron microgram.
Fig. 4 is pump light wavelength after two kinds of gas Raman frequency displacements and the phase in antiresonance hollow-core fiber transmission belt thereof
To position view.
Marginal data:
1, Near-infrared Tunable optical-fiber laser pumping source;2, antiresonance hollow-core fiber;3, the real core fibre of input;4, output is real
Core fibre;5, the first input Bragg grating;6, the second input Bragg grating;7, the first output Bragg grating;8, second
Output Bragg grating;9, the first fusion point;10, the second fusion point;11, the 3rd fusion point.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
As it is shown in figure 1, all optical fibre structure mid-infrared gas cascade Ramar laser of the present embodiment, adjustable including near-infrared
Humorous optical-fiber laser pumping source 1, antiresonance hollow-core fiber 2, the real core fibre 3 of input and the real core fibre 4 of output, the real core fibre 3 of input
Two ends respectively with the output tail optical fiber and one end welding of antiresonance hollow-core fiber 2 of Near-infrared Tunable optical-fiber laser pumping source 1,
Wherein the output tail optical fiber of Near-infrared Tunable optical-fiber laser pumping source 1 is by real core fibre 3 low-loss of the first fusion point 9 and input
Welding, one end of antiresonance hollow-core fiber 2 is by real core fibre 3 low loss welding of the second fusion point 10 and input, and antiresonance is empty
The other end of core fibre 2 is by real core fibre 4 low loss welding of the 3rd fusion point 11 and output;
Being filled with by the mixed gas of two kinds of Raman gain gas mixing in antiresonance hollow-core fiber 2, one of which Raman increases
QI invigorating body makes pump light generation stimulated Raman scattering produce first order raman laser, and another kind of Raman gain gas makes the first order draw
Graceful laser generation stimulated Raman scattering produces the second level raman laser of middle-infrared band;
Antiresonance hollow-core fiber 2 is the antiresonance hollow-core fiber of loss spectrum particular design, pumping laser wave band, the
One-level raman laser wave band, second level raman laser wave band are respectively provided with relatively low loss (< 0.5dB/m), and at other wave band
There is higher transmission loss (> 5dB/m);
The real core fibre 3 of input inscribes the first input cloth having the second level raman laser to middle-infrared band to form high reflection
Glug grating 5 and first order raman laser is formed the second input Bragg grating 6 of high reflection, the first input Bragg grating
5 and second input Bragg grating 6 peak reflectivity be all higher than 95%;The real core fibre 4 of output is inscribed to be had first order Raman
Laser formed high reflection the first output Bragg grating 7 and to the second level raman laser of middle-infrared band partially reflective the
Two output Bragg gratings 8, the first output Bragg grating 7 is more than 95% to the reflectance of first order raman laser, and second is defeated
Going out Bragg grating 8 to the absorbance of the second level raman laser of middle-infrared band is 10%-90%;
This all optical fibre structure mid-infrared gas cascade Ramar laser is a kind of compact, narrow linewidth, tunable optical fiber gas
Body Ramar laser, it utilizes the Raman frequency shift of two kinds of gases simultaneously, by further for the near-infrared laser wavelength of pump light output
Expand to mid-infrared direction.Operationally, by the near-infrared pumping laser warp of Near-infrared Tunable optical-fiber laser pumping source 1 outgoing
Output tail optical fiber and the first fusion point 9 enter the real core fibre 3 of input, then input Bradley through the first input Bragg grating 5, second
Lattice grating 6, the real core fibre 3 of input are filled with two kinds of Raman gains with the second fusion point 10 entrance of antiresonance hollow-core fiber 2 and mix
In the antiresonance hollow-core fiber 2 of gas, pump light is subject to a kind of Raman gain gas interaction therein in fibre core
Swashing Raman scattering and produce first order raman laser, first order raman laser interacts with the second Raman gain gas and occurs
Stimulated Raman scattering produces the second level raman laser of middle-infrared band.Through the real core fibre 4 of antiresonance hollow-core fiber 2 and output
3rd fusion point 11 enters the real core fibre 4 of output, owing to the second input Bragg grating 6 and the first output Bragg grating 7 are right
The reflection of first order raman laser, both combinations define the resonator cavity of first order raman laser, first order raman laser
Resonance is formed and fully with the under the multiple reflections effect of the second input Bragg grating 6 and the first output Bragg grating 7
Two kinds of Raman gain gas effects produce the second level raman laser of middle-infrared band.First input Bragg grating 5 and second
Output Bragg grating 8 defines the resonator cavity of the second level raman laser of middle-infrared band, can be by a part of mid-infrared ripple
The second level raman laser coupling output of section, another part is at the first input Bragg grating 5 and second output Prague light
Resonance is formed, to reduce pumping threshold under the multiple reflections effect of grid 8.
In the present embodiment, the second input Bragg grating 6 is positioned at the first input Bragg grating 5 and antiresonance hollow-core fiber
Between 2, the first output Bragg grating 7 is between the second output Bragg grating 8 and antiresonance hollow-core fiber 2.
In the present embodiment, the real core fibre of input 3 and the real core fibre 4 of output to pump light, first order raman laser and in
The second level raman laser of infrared band is respectively provided with relatively low loss (< 0.5dB/m).
In the present embodiment, antiresonance hollow-core fiber 2 uses the negative cruvature antiresonance hollow light of loss spectrum particular design
Fine 2, it is the hollow core structures of micron dimension, is constrained in by pump light in the space that cross section is micron dimension, can effectively strengthen
Pump light and the interaction of Raman gain gas, improve EFFECTIVE RANGE, and be designed in near-infrared and mid-infrared
Having multiple transmission belt, its loss is composed based on antiresonance optical waveguide model, namely light can be passed through in the position of transmission belt
The THICKNESS CONTROL of fine cladding capillaries wall, has relatively low loss at pumping wave band and two-stage Raman wavelength, and at it
It needs there is higher loss at the Raman signal wavelength of suppression.
In the present embodiment, the two or more Raman gain gases in antiresonance hollow-core fiber 2 are hydrogen and one or two
Planting alkanes gas, alkanes gas includes methane, ethane, propane, butane, ethylene etc..Or other suitable Raman gain
Mixed gas, the kind of gas is not limited to 2 kinds, can be 2 kinds or two or more, when Raman gain mixed gas kind is many
In 2 kinds time, corresponding stimulated Raman scattering progression is the most accordingly more than 2 kinds.
Below with hydrogen (H2) and propane (C3H8) as a example by combination, illustrate the of first order raman laser and middle-infrared band
The generation process of two grades of raman lasers and designing in the transmission belt of antiresonance hollow-core fiber 2.
During stimulated Raman scattering, single order Stokes wavelength can pass through formula (1) and obtain
In formula, λoutFor single order Stokes wavelength during stimulated Raman scattering, unit is nm;λpumpFor pumping wavelength,
Unit is nm;Δ ω is the Raman frequency shift of corresponding gas molecule during stimulated Raman scattering, and unit is cm-1。
When the centre wavelength of Near-infrared Tunable optical-fiber laser pumping source 1 is 1064nm, two in antiresonance hollow-core fiber 2
When kind Raman mixed gas is hydrogen and propane, pump light is first subject to propane interaction in antiresonance hollow-core fiber 2
Swash Raman scattering and produce first order raman laser.The Raman frequency shift of propane is 2908cm-1, by pumping wavelength and propane Raman frequency shift
It is 1541nm that substitution formula (1) can obtain first order raman laser wavelength.First order raman laser 1541nm is excited to draw as second time
Graceful scattering pumping source interacts with hydrogen and produces second level raman laser, by the Raman frequency shift 4155cm of 1541nm and hydrogen-1
In substitution formula (1), second level raman laser wavelength can be obtained, namely the tunable mid-infrared light fibre gas Raman that the present invention proposes swashs
The centre wavelength of light device Output of laser is 4283nm.When the center wavelength tuning of Near-infrared Tunable optical-fiber laser pumping source 1,
The mid-infrared laser that can be obtained the first order raman laser wavelength of correspondence and the proposed by the invention of correspondence by formula (1) is final
The centre wavelength of Output of laser.
During two-stage stimulated Raman scattering, it is possible to the such as competition such as rotary Raman, Higher-order Raman Raman can be produced
Spectral line, and the pump light of Near-infrared Tunable optical-fiber laser pumping source 1 likely first is excited to draw with hydrogen interaction
Graceful scattering produces rotary Raman laser or the vibrating Raman laser of 1907nm of 1135nm.Appearance for preventing these situations is permissible
By the transmission belt of appropriate design antiresonance hollow-core fiber 2, as shown in Figures 2 and 3, wherein Fig. 2 is icecream-type to its cross section
Antiresonance hollow-core fiber, Fig. 3 is free boundary type antiresonance hollow-core fiber, and in figure, fiber cross-sections light colour region is quartz knot
Structure, dark colour region is airport.Territory, the high loss zone wavelength location of antiresonance hollow-core fiber 2 can be obtained by formula (2).
In formula, λmFor resonant wavelength, unit is nm, namely high-transmission loss region wavelength, and d is cladding capillaries wall thickness
Degree, unit be nm, m be positive integer, n2And n1It is respectively clad silica and the refractive index of core region.By controlling covering capillary
The thickness of tube wall and then the transmission belt of antiresonance hollow-core fiber 2 can be designed so that pumping central wavelength lambda0(1064nm), first
Level raman laser wavelength X1(1541nm) and the final output center wavelength λ of laser instrument that proposes of the present invention2(4283nm) and light
The relative position of fine transmission spectrum is as shown in Figure 4.From fig. 4 it can be seen that three kinds of wavelength lay respectively at three transmission of this optical fiber
In band, pump light λ0Twice Raman frequency shift of priority through two kinds of gases is transferred to middle-infrared band λ2.Permissible by this design
The generation of inhibitor and competition Raman lines, improves the transformation efficiency of mid-infrared laser to greatest extent.
Above-mentioned centre wavelength is that the pump light of 1064nm can also first produce with hydrogen effect generation stimulated Raman scattering
The first order raman laser of 1907nm, now has only to the λ in Fig. 41The transmission belt at place designs to 1907nm.In like manner,
When the Raman gain mixed gas in antiresonance hollow-core fiber 2 is other gas, it is calculated two-stage Raman by formula (1) and swashs
Optical wavelength the transmission belt of Reasonable adjustment antiresonance hollow-core fiber 2.
The above is only the preferred embodiment of the present invention, and protection scope of the present invention is not limited merely to above-mentioned enforcement
Example.To those of ordinary skill in the art, the improvement obtained by under without departing from the technology of the present invention concept thereof and change
Change and also should be regarded as protection scope of the present invention.
Claims (4)
1. an all optical fibre structure mid-infrared gas cascade Ramar laser, it is characterised in that: include Near-infrared Tunable optical fiber
Laser pumping source (1), antiresonance hollow-core fiber (2), the real core fibre (3) of input and the real core fibre (4) of output, the real core of described input
The two ends of optical fiber (3) respectively with output tail optical fiber and the antiresonance hollow-core fiber (2) of Near-infrared Tunable optical-fiber laser pumping source (1)
One end welding, core fibre (4) welding real with output of the other end of described antiresonance hollow-core fiber (2);
In described antiresonance hollow-core fiber (2), mixing is filled with two or more Raman gain gas, at least one of which Raman gain
Gas makes pump light generation stimulated Raman scattering produce first order raman laser, and remaining Raman gain gas makes first order Raman swash
Light generation stimulated Raman scattering produces the second level raman laser of middle-infrared band;
Described antiresonance hollow-core fiber (2) is at pumping laser wave band, first order raman laser wave band, second level raman laser wave band
Loss<0.5dB/m, and in the loss of other wave band>5dB/m;
The real core fibre (3) of described input inscribes the first input having the second level raman laser to middle-infrared band to form high reflection
Bragg grating (5) and first order raman laser is formed the second input Bragg grating (6) of high reflection, described first input
The peak reflectivity of Bragg grating (5) and the second input Bragg grating (6) is all higher than 95%;The real core fibre of described output
(4) inscribe have the first output Bragg grating (7) that first order raman laser is formed high reflection and to middle-infrared band the
The second output Bragg grating (8) that two grades of raman lasers are partially reflective, described first output Bragg grating (7) is to the first order
The reflectance of raman laser is more than 95%, and the second level Raman of middle-infrared band is swashed by described second output Bragg grating (8)
The absorbance of light is 10%~90%.
All optical fibre structure mid-infrared gas the most according to claim 1 cascade Ramar laser, it is characterised in that: described the
Two inputs Bragg grating (6) are positioned between the first input Bragg grating (5) and antiresonance hollow-core fiber (2), and described first
Output Bragg grating (7) is positioned between the second output Bragg grating (8) and antiresonance hollow-core fiber (2).
All optical fibre structure mid-infrared gas the most according to claim 1 cascade Ramar laser, it is characterised in that: described defeated
Enter real core fibre (3) and the real core fibre (4) of output to described pump light, first order raman laser and the second of middle-infrared band
Loss < the 0.5dB/m of level raman laser.
All optical fibre structure mid-infrared gas the most according to claim 1 cascade Ramar laser, it is characterised in that: described instead
Two or more Raman gain gases in resonance hollow-core fiber (2) include hydrogen and more than one alkanes gases, described alkane
Class gas includes methane, ethane, propane, butane and ethylene.
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CN111579530A (en) * | 2020-05-26 | 2020-08-25 | 江苏师范大学 | Multi-component trace gas detection system and method based on mid-infrared all-fiber direct absorption method |
CN111864514A (en) * | 2020-05-28 | 2020-10-30 | 中国人民解放军国防科技大学 | 2.33 mu m laser light source and all-fiber cascade narrow-linewidth 4.66 mu m optical fiber gas laser |
CN111864512A (en) * | 2020-05-28 | 2020-10-30 | 中国人民解放军国防科技大学 | 2.33 μm laser light source and 4.66 μm waveband fiber gas laser cascaded by two gases |
CN111864515A (en) * | 2020-05-28 | 2020-10-30 | 中国人民解放军国防科技大学 | 2.33 μm laser light source and 4.66 μm optical fiber gas laser with cascade structure |
CN111864516A (en) * | 2020-05-28 | 2020-10-30 | 中国人民解放军国防科技大学 | Narrow-linewidth all-fiber cascade 4.66 mu m optical fiber gas laser with oscillator structure |
CN111864516B (en) * | 2020-05-28 | 2021-11-19 | 中国人民解放军国防科技大学 | Narrow-linewidth all-fiber cascade 4.66 mu m optical fiber gas laser with oscillator structure |
CN111864521A (en) * | 2020-07-31 | 2020-10-30 | 中国人民解放军国防科技大学 | All-fiber sodium guide star laser generation device |
CN113777722A (en) * | 2021-04-16 | 2021-12-10 | 北京工业大学 | Intermediate infrared laser transmission system based on hollow anti-resonance optical fiber |
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