CN106300002B - A kind of fiber-optic fiber gas cascade Ramar laser that the tuning of 3~5 mu m wavebands can be achieved - Google Patents
A kind of fiber-optic fiber gas cascade Ramar laser that the tuning of 3~5 mu m wavebands can be achieved Download PDFInfo
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- CN106300002B CN106300002B CN201610820639.3A CN201610820639A CN106300002B CN 106300002 B CN106300002 B CN 106300002B CN 201610820639 A CN201610820639 A CN 201610820639A CN 106300002 B CN106300002 B CN 106300002B
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- H—ELECTRICITY
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- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/30—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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- 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
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
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- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
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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
- H01S3/305—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 a gas
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Abstract
A kind of fiber-optic fiber gas cascade Ramar laser that the tuning of 3~5 mu m wavebands can be achieved, the laser includes the tunable pumping source of 1 mu m waveband, first order gas Raman laser generator and second level gas Raman laser generator, 1 μm of the pumping laser that the tunable pumping source of 1 mu m waveband is produced is changed into first order Raman scattering laser by the first order gas Raman laser generator, and the first order Raman scattering laser is the laser of 1.5 mu m wavebands or 2 mu m wavebands；First order Raman scattering laser is changed into second level Raman scattering laser by the second level gas Raman laser generator, and Raman scattering laser in the second level is the tunable mid-infrared laser of 3~5 mu m wavebands.The present invention realizes the tunable mid-infrared laser output of 3~5 mu m wavebands by the way of gas Raman cascade in antiresonance negative cruvature hollow-core fiber first.
Description
Technical field
The invention belongs to field of laser device technology, it is related to a kind of based on gas cascade stimulated Raman scattering effect in hollow-core fiber
It, should can produce the new laser of 3~5 mu m wavebands tuning mid-infrared laser output.
Background technology
3~5 mu m waveband middle infrared lasers are in propagation in atmosphere window due to its wavelength, are adapted to remote in an atmosphere pass
It is defeated, therefore in the civilian technology such as the military fields such as infrared counteraction, laser radar and laser spectrum experiment, atmosphere environment supervision neck
There is important application value in domain, is all the focus of international research all the time.
The conventional art means of currently acquired mid-infrared laser mainly include gas molecules sorb transition and non-linear change
Frequency technology.
Chemical laser is exactly to be produced using the absorption in over-frequency and fundamental transition of HF, DF molecule in 2.7 μm and 3.8 μm
Infrared laser is exported, and can reach megawatts of power level, and with good beam quality.But, chemical laser needs
Complicated and huge vacuum tail gas processing system, bulky, mobility is poor, limits the application of chemical laser.
Optical parametric oscillation be it is currently acquired in infrared output a kind of important additive mixing technological means, pass through high at present
Commercialized 1064nm laser pump (ing)s nonlinear crystal is spent, the broad tuning output of whole middle-infrared band can be obtained, but it is limited
Relatively low in the damage threshold of solid nonlinear crystal, mid-infrared light parameter oscillation laser power level, which never has, obtains big
Lifting.
Raman scattering is the additive mixing means of another important acquisition mid-infrared laser, and conversion efficiency is very
Height, solid Roman laser conversion quantum efficiency can be even reached close to 100%.But, the Raman frequency of solid Roman medium
The Raman frequency shift that coefficients comparison is small, there was only hundreds of wave numbers substantially is moved, so needing in could being realized by multi-stage cascade Raman
Infrared output, Raman conversion efficiency reduces with the increase of Raman series, thus in cascaded infrared Raman solid state laser
Conversion efficiency is general all very low.
Compared to solid Roman medium, gas Raman medium has bigger Raman frequency shift coefficient, such as the vibration of hydrogen
Raman frequency shift coefficient is 4155cm-1As long as can just realize near-infrared frequency infrared in by second order even single order Raman
Conversion.Traditional gas Raman laser typically uses the mutual distance of pumping laser and Raman medium in air chamber, air chamber
It is very short, cause threshold pump power very high, or even the power level of needs megawatt can be only achieved pumping threshold.Further, since
It is inevitably generated multistage Raman signal, so as to get the Raman conversion efficiency of specific wavelength is very low.
The content of the invention
Need many level Raman frequency conversions using infrared output in solid Roman media implementation to cause to draw in the prior art
Graceful conversion efficiency very low shortcoming.And in traditional gas cavity configuration, due to pumping laser and Raman gas operating distance very short-range missile
Cause pumping threshold very high, realize that the output of gas Raman mid-infrared laser needs very high pump power.In order to overcome existing skill
Disadvantages described above in art, big present invention incorporates gas Raman frequency displacement coefficient, infrared output only needs to one to second order drawing in realization
The advantage of graceful scattering, and pumping laser and Raman medium EFFECTIVE RANGE length in hollow-core fiber, Raman threshold are low, Raman turns
Change the advantage of efficiency high.On this basis, the present invention proposes a kind of fiber-optic fiber gas cascade that the tuning of 3~5 mu m wavebands can be achieved
Ramar laser.
The technical solution adopted by the present invention is：
A kind of fiber-optic fiber gas cascade Ramar laser that the tuning of 3~5 mu m wavebands can be achieved, it is tunable with 1 mu m waveband
Laser generator is pumping source, and 3~5 μm of ripples are produced by the cascade stimulated Raman scattering of gas of the same race or two kinds of gas with various
The mid-infrared laser output that section is tunable.The laser includes the tunable pumping source of 1 mu m waveband, first order gas Raman laser and produced
Generating apparatus and second level gas Raman laser generator, the first order gas Raman laser generator can by 1 mu m waveband
1 μm of the pumping laser that tuning pump source is produced changes into first order Raman scattering laser, the first order Raman scattering laser
For 1.5 mu m wavebands or the laser of 2 mu m wavebands；The second level gas Raman laser generator swashs first order Raman scattering
Light changes into second level Raman scattering laser, and Raman scattering laser in the second level is the tunable mid-infrared laser of 3~5 mu m wavebands.
1 μm of the pumping laser coupling that first order gas Raman laser generator produces the tunable pumping source of 1 mu m waveband
Close and in one section of hollow-core fiber filled with first order Raman gas, pass through first order Raman into first order raman laser generation device
The laser of 1 mu m waveband is transformed into the first order Raman scattering of 1.5 mu m wavebands or 2 mu m wavebands by the stimulated Raman scattering of gas molecule
Laser；The first order raman laser of generation is coupled in the raman laser generation device of the second level one section filled with second level Raman again
In the hollow-core fiber of gas, the mu m waveband of the second level 3~5 is produced using the stimulated Raman scattering of second level Raman gas molecule adjustable
Humorous mid-infrared laser.
The transmission spectrum for the hollow-core fiber that its first order raman laser generation device of the present invention is used is met：Pump wavelength0
For 1 μm, raman laser wavelength X1For 1.5 μm or 2 μm, pumping wavelength and raman laser wavelength are located at hollow-core fiber transmission spectrum
In.The transmission spectrum for the hollow-core fiber that second level raman laser generation device is used is met：Pump wavelength0For 1.5 μm or 2 μm,
Raman laser wavelength X1For 3~5 μm, pumping wavelength and raman laser wavelength are similarly positioned in hollow-core fiber transmission spectrum.
First order Raman gas is a kind of alkanes gas or hydrogen.The alkanes gas includes methane, ethane, third
Alkane, butane, ethene etc..
Second level Raman gas is hydrogen or a kind of alkanes gas.Alkanes gas includes methane, ethane, propane, fourth
Alkane, ethene etc..
The 1 mu m waveband tunable laser generation device can be laser oscillator or laser amplifier；Can be with
It is optical-fiber laser generation device or Solid State Laser generation device；Can be pulse laser generation device or company
Continuous laser generator.
The first order raman laser generation device and second level raman laser generation device can be that single-pass configuration swashs
Light generating device or annular chamber feedback arrangement laser generator.
Further, the single-pass configuration laser generator includes 1# high reflective mirrors, 2# successively along optic path direction
High reflective mirror, 1# half-wave plates, polarization splitting prism, 2# half-wave plates, coupled lens, input air chamber, hollow-core fiber, output end gas
Room, output lens and filter plate.Pumping laser realizes the collimation to pumping laser by 1# high reflective mirrors and 2# high reflective mirrors,
The power of pumping laser after 1# half-wave plates and polarization splitting prism collimation is controlled, 2# half-wave plates regulation pumping laser
Input window of the pumping laser through input air chamber is coupled in the fibre core of hollow-core fiber by polarization direction, coupled lens, pumping
The drawing that stimulated Raman scattering effect produces one way amplification occurs in hollow fibre core with the Raman gas filled in fibre core for laser
Graceful laser, is filtered out by filter plate and raman laser is directly exported after remnant pump laser again after then being collimated by output lens.
With Raman gas only stimulated Raman scattering occurs in one way for pumping laser in single-pass configuration laser generator, substantially draws
Graceful laser amplifier configurations.
In single-pass configuration laser generator, input air chamber be provided with allow light beam by while the input that seals
Window.Hollow-core fiber is connected between input air chamber and output end air chamber, input air chamber provided with allow light beam by while
The input window sealed, output end air chamber be provided with equally allow light beam by while the output window that seals
Mouthful.Input air chamber and output end air chamber can be realized supplements Raman gas to hollow-core fiber.Hollow-core fiber by pumping laser and
Raman gas is constrained in the fibre core of μm magnitude.
Further, the annular chamber feedback arrangement laser generator includes 3# height instead successively along optic path direction
Mirror, 4# high reflective mirrors, 3# half-wave plates, polarization splitting prism, 4# half-wave plates, coupled lens, pumping laser high dichroic mirror, input thoroughly
Air chamber, hollow-core fiber, output end air chamber, output lens, filter plate, 5# high reflective mirrors, output coupling mirror and feedback coupled lens.
Pumping laser realizes the collimation to pumping laser, 3# half-wave plates and polarization splitting prism alignment through 3# high reflective mirrors and 4# high reflective mirrors
The power of pumping laser after straight is controlled, 4# half-wave plates regulation pumping laser polarization direction.Exported through 4# half-wave plates
Pumping laser realizes the pattern match of pumping laser and hollow-core fiber fibre core by coupled lens, and then pumping laser passes through pumping
The input window of laser high dichroic mirror and input air chamber thoroughly is coupled in the fibre core of hollow-core fiber, and pumping laser is in hollow light
With the raman laser for the Raman gas generation stimulated Raman scattering effect generation one way amplification being filled in fibre core in fine fibre core,
Raman laser is sequentially passed through after the output window of output end air chamber, output collimation lens collimation, filter plate filtering, high reflective mirror reflection
Output coupling mirror is reached, a part of raman laser is high thoroughly double by feedback coupled lens and pumping laser again through output coupling mirror
Re-injected into after Look mirror in hollow-core fiber, form annular chamber backfeed loop, output coupling mirror is straight by another part raman laser
Connect output.
In annular chamber feedback arrangement laser generator, its input air chamber provided with allow light beam by while from seal make
Input window.Hollow-core fiber is connected between input air chamber and output end air chamber, and input air chamber, which is provided with, allows light beam to lead to
The input window sealed while mistake, output end air chamber be provided with equally allow light beam by while seal
Output window.Input air chamber and output end air chamber can be inflated to hollow-core fiber.Hollow-core fiber is by pumping laser and Raman gas
Body is constrained in the fibre core of μm magnitude.
The annular chamber feedback arrangement laser generator is on the basis of single-pass configuration laser generator, in input
A dichroic mirror is added before window, the raman laser that single-pass configuration is exported is fed back again and is coupled in hollow-core fiber, formation is closed
Ring structure, has substantially constituted laser oscillator structure.
Further, the hollow-core fiber in the first order raman laser generation device (is used in 1 μm and 1.5 mu m wavebands
Produce 1.5 mu m waveband first order raman lasers) or 1 μm and 2 mu m wavebands (being used to produce 2 mu m waveband first order raman lasers) have
Relatively low transmission loss.The first order Raman gas includes the alkanes gases such as methane, ethane, propane, butane, ethene and (produced
1.5 mu m waveband first order raman lasers) and hydrogen (producing 2 mu m waveband first order raman lasers).
Further, the hollow core fibre of second level raman laser generation device is in 1.5 μm and 3~5 mu m wavebands (first
Level raman laser be 1.5 mu m wavebands) or 2 μm and 3~5 mu m wavebands (first order raman laser is 2 mu m wavebands) with compared with low transmission
Loss；The second level Raman gas includes alkanes gas and the hydrogen such as methane, ethane, propane, butane, ethene.
The technical effects of the invention are that：
1st, the present invention realizes 3~5 μm of tunable mid-infrared laser outputs in a fiber first so that develop compact conformation steady
Fixed mid-infrared light source is possibly realized；
2nd, the present invention is constrained in pumping laser and Raman gas in fibre core using hollow-core fiber, pumping laser and Raman gas
The effective interaction distance of body is very long, and the loss of hollow-core fiber is very low, greatly reduces pumping threshold；And hollow light
Fine output loss spectrum can be with particular design so that have at pumping wavelength and single order Raman wavelength compared with low-loss, and in height
There is very high loss at rank Raman wavelength, the conversion efficiency of single order Raman signal is substantially increased.
3rd, the present invention is pumping source using 1 common mu m waveband laser, has only used the two-stage of two kinds of gases or gas of the same race
Cascade Raman is achieved that 3~5 μm of mid-infrared laser outputs, and total Raman conversion efficiency is very high.
The appearance of hollow-core fiber waveguiding structure provides ideal environment for gas stimulated Raman scattering.Hollow-core fiber
Effectively pumping laser can be constrained in the fibre core of μm magnitude, it is abundant with the Raman gas that is filled in hollow-core fiber fibre core
Effect, EFFECTIVE RANGE is very long, will substantially reduce Raman threshold.Further, can be by rationally designing hollow-core fiber
Structural parameters, obtain specific transmission loss characteristic, the middle-infrared band for making hollow-core fiber be produced in pumping wave band and wanting
There is very low transmission loss simultaneously, the Raman conversion efficiency of specific middle infrared wavelength can be greatly improved.
Brief description of the drawings
Fig. 1 show a kind of fiber-optic fiber gas cascade Raman laser structure sketch that the tuning of 3~5 mu m wavebands can be achieved.
101 be the tunable pumping source of 1 mu m waveband；102 be the pumping for 1 mu m waveband that the tunable pumping source of 1 mu m waveband is produced
Laser；103 be first order raman laser generation device；104 be first order Raman scattering laser；105 be second level raman laser
Generation device；106 be second level Raman scattering laser.
Fig. 2 (a) and Fig. 2 (b) respectively illustrate a kind of fiber-optic fiber gas cascade Raman that the tuning of 3~5 mu m wavebands can be achieved and swashed
Light device fundamental diagram.
A kind of fiber-optic fiber gas cascade Raman laser structure figure that the tuning of 3~5 mu m wavebands can be achieved shown in Fig. 3.
Fig. 3 (a), (b), (c), (d) are a kind of fiber-optic fiber gas cascade Ramar lasers that the tuning of 3~5 mu m wavebands can be achieved
Four kinds of structure charts, correspond to respectively：Two-stage Ramar laser is that ring cavity structure, first order ring cavity structure plus the second level are single
Journey structure, first order single-pass configuration add second level ring cavity structure and two-stage Ramar laser is single-pass configuration.
300 be pump laser；301 be 1 μm of pumping laser；302 be the first high reflective mirror；303 be the second high reflective mirror；304
For the first half-wave plate；305 be 1# polarization splitting prisms；306 be the second half-wave plate；307 be 1# coupled lens；308 be 1# pumpings
The high dichroic mirror thoroughly of laser；309 be 1# incidence windows；310 be 1# input air chambers；311 be 1# hollow-core fibers；312 be that 1# is exported
Hold air chamber；313 be 1# output windows；314 be 1# collimation lenses；315 be 1# filter plates；316th, the 3rd high reflective mirror；317 be 1# couplings
Close outgoing mirror；318 be that 1# feeds back coupled lens；319 be first order Raman gas；320 be first order Raman scattering laser；
321 it is the 4th high reflective mirror, 322 is the 5th high reflective mirror；323 be the 3rd half-wave plate；324 be 2# polarization splitting prisms；
325 be the 4th half-wave plate；326 be 2# coupled lens；327 be the high dichroic mirror thoroughly of 2# pumping lasers；328 be 2# incidence windows；329
For 2# input air chambers；330 be 2# hollow-core fibers；331 be 2# output end air chambers；332 be 2# output windows；333 be that 2# is collimated
Lens；334 be 2# filter plates, and 335 be the 6th high reflective mirror；336 be 2# output coupling mirrors；337 be that 2# feeds back coupled lens；338
For second level Raman gas；339 be 3~5 μm of Raman scattering laser that second level raman laser generation device is exported；
Fig. 4 show a kind of fiber-optic fiber gas that the tuning of 3~5 mu m wavebands can be achieved and cascades hollow used in Ramar laser
Cross section of optic fibre scanning electron microscope (SEM) photograph, wherein Fig. 4 (a) are electric for the cross-sectional scans of free boundary type antiresonance negative cruvature hollow-core fiber
Mirror figure；Fig. 4 (b) is icecream-type antiresonance negative cruvature hollow-core fiber cross-sectional scans electron microscope.
Fig. 5 show a kind of fiber-optic fiber gas that the tuning of 3~5 mu m wavebands can be achieved and cascades hollow used in Ramar laser
The design transmission spectrum schematic diagram of optical fiber
Embodiment
The invention will be further described with reference to the accompanying drawings and detailed description.
Fig. 1, Fig. 2 show a kind of fiber-optic fiber gas cascade Raman laser structure sketch that the tuning of 3~5 mu m wavebands can be achieved
And fundamental diagram.The present invention includes the tunable pumping source 101 of 1 mu m waveband, the and of first order gas Raman laser generator 103
Second level gas Raman laser generator 105, first order gas Raman laser generator 103 is by the tunable pump of 1 mu m waveband
1 μm of the pumping laser 102 that Pu source is produced changes into first order Raman scattering laser 104, the first order Raman scattering laser
104 be the laser of 1.5 mu m wavebands or 2 mu m wavebands；The second level gas Raman laser generator 105 is by first order Raman
Scattering laser changes into second level Raman scattering laser 106, and second level Raman scattering laser 106 is that 3~5 mu m wavebands are tunable
Mid-infrared laser.
The first order in a kind of fiber-optic fiber gas cascade Ramar laser that the tuning of 3~5 mu m wavebands can be achieved of the present invention is drawn
Graceful laser generator and second level raman laser generation device are single-pass configuration laser generator or annular chamber feedback arrangement
Laser generator.
Specifically it may be designed so that：As shown in Fig. 3 (a), first order raman laser generation device and second level Raman swash
Light generating device is annular chamber feedback arrangement laser generator.Or as shown in Fig. 3 (b), first order raman laser is produced
Device is annular chamber feedback arrangement laser generator；Second level raman laser generation device is that single-pass configuration laser produces dress
Put.Or as shown in Fig. 3 (c), first order raman laser generation device is single-pass configuration laser generator；Second level Raman swashs
Light generating device is annular chamber feedback arrangement laser generator.Or as shown in Fig. 3 (d), first order raman laser produces dress
It is single-pass configuration laser generator to put with second level raman laser generation device.
It is that annular chamber feedback arrangement laser generator illustrates that one kind of the present invention can be achieved 3 with two-level laser below
The fiber-optic fiber gas of~5 mu m wavebands tuning cascades the embodiment of Ramar laser：
As shown in Fig. 3 (a), a kind of fiber-optic fiber gas cascade Ramar laser that the tuning of 3~5 mu m wavebands can be achieved, including pump
Pu laser 300, first order raman laser generation device and second level raman laser generation device, wherein first order raman laser
Generation device and second level raman laser generation device are annular chamber feedback arrangement laser generator.First order gas Raman
1 μm of the pumping laser 301 that pump laser 300 is produced is changed into first order Raman scattering laser 320 by laser generator,
The first order Raman scattering laser 320 is the laser of 1.5 mu m wavebands or 2 mu m wavebands.First order Raman scattering laser 320 is simultaneously
It is used as the pumping laser of second level raman laser generation device.First order raman laser generation device along optic path direction according to
It is secondary including the first high reflective mirror 302, the second high reflective mirror 303, the first half-wave plate 304,1# polarization splitting prisms 305, the second half-wave plate
306th, 1# coupled lens 307,1# pumping lasers high dichroic mirror 308,1# inputs air chamber 310,1# hollow-core fibers 311,1# thoroughly are defeated
Go out to hold air chamber 312,1# collimation lenses 314,1# filter plates 315, the 3rd high reflective mirror 316,1# output coupling mirrors 317 and 1# feedback couplings
Close lens 318.
1 μm of pumping laser 301 that pump laser 300 is produced is real by the first high reflective mirror 302 and the second high reflective mirror 303
The collimation to pumping laser is showed.First high reflective mirror 302 and the second high reflective mirror 303 are 1 μm of high reflective mirror.First half-wave plate 304
It is controlled with the power of the pumping laser after 1# polarization splitting prisms 305 again collimation, then the second half-wave plate 306 is right again
Regulation is realized in the polarization direction of pumping laser, the polarization direction of pumping laser is optimal coupling effect, wherein the first half-wave
The half-wave plate 306 of piece 304 and second is 1 μm of half-wave plate, and 1# polarization splitting prisms 305 are 1 mu m polarized Amici prism.Then, pump
Pu laser realizes the pattern match of its fibre core of pumping laser Yu hollow-core fiber by 1# coupled lens 307, and then pumping laser is passed through
The 1# input windows 309 for crossing 1# pumping lasers high dichroic mirror 308 and 1# input air chambers thoroughly are coupled to 1# hollow-core fibers 311
In fibre core.1# hollow-core fibers 311 are in 1 μm and 1.5 mu m wavebands or in 1 μm and the relatively low hollow light of 2 mu m waveband transmission loss
It is fine.Pumping laser is excited in the fibre core of 1# hollow-core fibers 311 with being filled in first order Raman gas 319 therein
Raman scattering interactions, are converted to the first order stimulated Raman Scattering light of 1.5 μm or 2 mu m wavebands, 1.5 μm or 2 μm
The Raman scattering laser of the first order of wave band sequentially passes through the 1# output windows 313 of 1# output ends air chamber 312,1# collimation lenses
314 collimations, (the 1 μm of pumping laser efficient absorption of filter plate 315 pair, to 1.5 μm or 2 μm of first order Raman scatterings of 1# filter plates 315
Light is high thoroughly；) filtering, reach 1# output coupling mirrors 317, a part of first order Raman scattering laser after the reflection of the 3rd high reflective mirror 316
Refilled again after 1# feeds back coupled lens 318 and the high dichroic mirror 308 thoroughly of 1# pumping lasers through 1# output coupling mirrors 317
Into 1# hollow-core fibers 311, annular chamber backfeed loop is formed, 1# output coupling mirrors 317 are by another part first order Raman scattering
Laser coupled output as first order raman laser generation device produce 1.5 μm or 2 mu m wavebands first order Raman scattering
Laser 320 is exported, it is achieved thereby that the first order Raman scattering laser 320 of 301 to 1.5 μm of 1 μm of pumping laser or 2 mu m wavebands
Output.
1.5 μm of the output of first order raman laser generation device or the first order Raman scattering laser 320 of 2 mu m wavebands are made
For the pumping laser of second level raman laser generation device, also pass through and first order raman laser generation device structure identical
The Ramar laser of ring cavity structure, occurs stimulated Raman scattering effect with the second level Raman gas in hollow-core fiber, produces 3
~5 μm of Raman scattering laser 339 are exported.
Specifically, raman laser generation device in the second level includes the 4th high reflective mirror 321, the successively along optic path direction
Five high reflective mirrors 322, the 3rd half-wave plate 323,2# polarization splitting prisms 324, the 4th half-wave plate 325,2# coupled lens 326,2# pumps
Pu laser high dichroic mirror 327,2# inputs air chamber 329, hollow-core fiber 330,2# output ends air chamber 331,2# collimation lenses thoroughly
333rd, 2# filter plates 334, the 6th high reflective mirror 335,2# output coupling mirrors 336 and 2# feedback coupled lens 337.Wherein the 4th is high anti-
The high reflective mirror 322 of mirror 321 and the 5th is 1.5 μm or 2 μm of high reflective mirrors.3rd half-wave plate 323 and the 4th half-wave plate 325 are 1.5 μ
M or 2 μm of half-wave plate.2# polarization splitting prisms 324 are 1.5 μm or 2 mu m polarized Amici prisms.The high dichroic mirror thoroughly of 2# pumping lasers
327 pairs 1.5 μm or 2 μm of pumping lasers it is high thoroughly, it is high to 3~5 μm of second level Raman diffused lights anti-.2# hollow-core fibers 330 are 1.5
μm and 3~5 mu m wavebands or in 2 μm and the relatively low hollow-core fiber of 3~5 μm of transmission loss.1.5 μm or 2 μm of 2# filter plates 334 pair
Pumping laser efficient absorption, it is high to 3~5 μm of Raman diffused lights saturating.6th high reflective mirror 335 is 3~5 μm of high reflective mirrors.
As shown in Fig. 3 (b), a kind of fiber-optic fiber gas cascade Ramar laser that the tuning of 3~5 mu m wavebands can be achieved, including pump
Pu laser 300, first order raman laser generation device and second level raman laser generation device, wherein first order raman laser
Generation device annular chamber feedback arrangement laser generator, second level raman laser generation device is that single-pass configuration laser produces dress
Put.1 μm of the pumping laser 301 that pump laser 300 is produced is changed into first by first order gas Raman laser generator
Level Raman scattering laser 320, the first order Raman scattering laser 320 is the laser of 1.5 mu m wavebands or 2 mu m wavebands.
It is high anti-that first order raman laser generation device includes the first high reflective mirror 302, second along optic path direction successively
Mirror 303, the first half-wave plate 304,1# polarization splitting prisms 305, the second half-wave plate 306,1# coupled lens 307,1# pumping lasers
High dichroic mirror 308,1# inputs air chamber 310,1# hollow-core fibers 311,1# output ends air chamber 312,1# collimation lenses 314,1# thoroughly
Filter plate 315, the 3rd high reflective mirror 316,1# output coupling mirrors 317 and 1# feedback coupled lens 318.Here first order raman laser
The structure and implementation of generation device are identical with the first order raman laser generation device in Fig. 3 (a), herein no longer
Repeat.
Second level raman laser generation device is single-pass configuration laser generator, and it is wrapped successively along optic path direction
Include the 4th high reflective mirror 321, the 5th high reflective mirror 322, the 3rd half-wave plate 323,2# polarization splitting prisms 324, the 4th half-wave plate 325,
2# coupled lens 326,2# inputs air chamber 329,2# hollow-core fibers 330,2# output ends air chamber 331,2# collimation lenses 333 and 2#
Filter plate 334, first order Raman scattering laser 320 is high by the 4th as the pumping laser of second level raman laser generation device
The anti-high reflective mirror 322 of mirror 321 and the 5th realizes the collimation to pumping laser, the 3rd half-wave plate 323 and 2# polarization splitting prisms 324
The power of pumping laser after collimation is controlled, and the 4th half-wave plate 325 regulation pumping laser polarization direction, 2# couplings are saturating
2# input window 328 of the pumping laser through 2# inputs air chamber 329 is coupled in the fibre core of 2# hollow-core fibers 330 by mirror 326, pump
Stimulated Raman scattering effect occur in 2# hollow-core fibers 330 with the Raman gas filled in fibre core for Pu laser produce one way to put
Big raman laser, is then exported by the 2# output windows 332 of 2# output ends air chamber 331, and the raman laser of output is accurate through 2#
Straight lens 333 are filtered out by 2# filter plates 334 and directly exported after remnant pump laser again after collimating, and output is 3~5 μm of drawings
Graceful scattering laser 339.
The hollow-core fiber that the present invention is used is the antiresonance negative cruvature hollow for having relatively low transmission loss in middle-infrared band
Optical fiber, many capillaries 402 of this optical fiber in cladding capillaries 401, fibre core 403 and fibre core are constituted, and all capillaries are equal
For glass material.Antiresonance negative cruvature hollow-core fiber can be divided into according to the shape of capillary 402 by free boundary type antiresonance
Negative cruvature hollow-core fiber and icecream-type antiresonance negative cruvature hollow-core fiber, wherein free boundary type antiresonance negative cruvature hollow light
Capillary 402 in fibre core corresponding to fibre is circle.Fibre core corresponding to icecream-type antiresonance negative cruvature hollow-core fiber
Interior capillary 402 has class shape of ice cream.Free boundary type antiresonance negative cruvature hollow-core fiber and icecream-type antiresonance
Negative cruvature hollow-core fiber is respectively as shown in Fig. 4 (a) and 4 (b), and white portion is airport in figure, and gray area is glass material.
According to actual needs, thus it is possible to vary the size of cladding capillaries 401 and the size and number of fibre core inner capillary tube 402, especially
For the free boundary type antiresonance negative cruvature hollow-core fiber shown in Fig. 4 (a), the size of each capillary 402 can be with different.This
Planting the high loss zone domain wavelength location of hollow-core fiber can be given by：
In formula, λmFor resonant wavelength, unit is nm, namely high-transmission loss region wavelength；D is fibre core capillary 402
Equivalent wall thickness, unit is nm；M is positive integer, represents different resonance zones；n2And n1Respectively cladding glass and core region
The refractive index of (generally air).
By controlling the thickness of cladding capillaries wall and then the transmission belt of antiresonance negative cruvature hollow-core fiber can be designed, make
Obtain pump wavelength0, raman laser wavelength X1Relative position with the transmission spectrum of optical fiber is as shown in Figure 5.It is seen from fig 5 that pump
Pumping wavelength λ0With raman laser wavelength X1Respectively in two transmission belts of the optical fiber, competition can be suppressed by this design
The generation of Raman lines, improves the transformation efficiency of mid-infrared laser to greatest extent.
The explanation of the preferred embodiment of the present invention contained above, this be in order to describe the technical characteristic of the present invention in detail, and
It is not intended to the content of the invention being limited in the concrete form described by embodiment, according to other of present invention purport progress
Modifications and variations are also protected by this patent.The purport of present invention is to be defined by the claims, rather than by embodiment
Specific descriptions are defined.
Claims (7)
1. a kind of fiber-optic fiber gas cascade Ramar laser that the tuning of 3~5 mu m wavebands can be achieved, it is characterised in that including 1 mu m waveband
Tunable pumping source, first order gas Raman laser generator and second level gas Raman laser generator, described first
1 μm of the pumping laser that the tunable pumping source of 1 mu m waveband is produced is coupled into the first order and drawn by level gas Raman laser generator
In graceful laser generator in one section of hollow-core fiber filled with first order Raman gas, by first order Raman gas molecule by
Swash the first order Raman scattering laser that the laser of 1 mu m waveband is transformed into 1.5 mu m wavebands or 2 mu m wavebands by Raman scattering；Described
The first order raman laser that secondary gas raman laser generation device produces the first order raman laser generation device is coupled
Into one section of hollow-core fiber filled with second level Raman gas, produced using the stimulated Raman scattering of second level Raman gas molecule
The mid-infrared laser that 3~5 mu m wavebands are tunable；
The first order gas Raman laser generator and the hollow-core fiber of second level raman laser generation device use are
There is the antiresonance negative cruvature hollow-core fiber of relatively low transmission loss in middle-infrared band, the antiresonance negative cruvature hollow-core fiber is
Free boundary type or icecream-type antiresonance negative cruvature hollow-core fiber；Free boundary type or icecream-type antiresonance negative cruvature hollow
Optical fiber is constituted by many capillaries in cladding capillaries, fibre core and fibre core, and all capillaries are glass material；Wherein certainly
It is circle as the capillary in the fibre core corresponding to Boundary-Type antiresonance negative cruvature hollow-core fiber；The negative song of icecream-type antiresonance
The capillary in fibre core corresponding to rate hollow-core fiber has class shape of ice cream；
At least one in the first order raman laser generation device and second level raman laser generation device is anti-using annular chamber
Present structure laser generator；It is high that the annular chamber feedback arrangement laser generator includes 3# along optic path direction successively
The high dichroic mirror thoroughly of anti-mirror, 4# high reflective mirrors, 3# half-wave plates, polarization splitting prism, 4# half-wave plates, coupled lens, pumping laser, input
Hold air chamber, hollow-core fiber, output end air chamber, output lens, filter plate, 5# high reflective mirrors, output coupling mirror and feedback coupling saturating
Mirror；Pumping laser realizes the collimation to pumping laser, 3# half-wave plates and polarization splitting prism through 3# high reflective mirrors and 4# high reflective mirrors
The power of pumping laser after collimation is controlled, 4# half-wave plates regulation pumping laser polarization direction；It is defeated through 4# half-wave plates
The pumping laser gone out realizes the pattern match of pumping laser and hollow-core fiber fibre core by coupled lens, and then pumping laser passes through
The input window of pumping laser high dichroic mirror and input air chamber thoroughly is coupled in the fibre core of hollow-core fiber, and pumping laser is in sky
With the Raman for the Raman gas generation stimulated Raman scattering effect generation one way amplification being filled in fibre core in the fibre core of core fibre
Laser, raman laser sequentially passes through the output window of output end air chamber, output collimation lens collimation, filter plate filtering, high reflective mirror
Output coupling mirror is reached after reflection, a part of raman laser is through output coupling mirror again by feedback coupled lens and pumping laser
Re-injected into after high dichroic mirror thoroughly in hollow-core fiber, form annular chamber backfeed loop, output coupling mirror is by another part Raman
Laser is directly exported.
2. the fiber-optic fiber gas cascade Ramar laser according to claim 1 that the tuning of 3~5 mu m wavebands can be achieved, its feature
It is, the high loss zone domain wavelength location of antiresonance negative cruvature hollow-core fiber can be given by：
<mrow>
<msub>
<mi>&lambda;</mi>
<mi>m</mi>
</msub>
<mo>=</mo>
<mfrac>
<mrow>
<mn>2</mn>
<mi>d</mi>
</mrow>
<mi>m</mi>
</mfrac>
<msqrt>
<mrow>
<msubsup>
<mi>n</mi>
<mn>2</mn>
<mn>2</mn>
</msubsup>
<mo>-</mo>
<msubsup>
<mi>n</mi>
<mn>1</mn>
<mn>2</mn>
</msubsup>
</mrow>
</msqrt>
</mrow>
In formula, λmFor resonant wavelength, unit is nm, namely high loss zone domain wavelength；D is cladding capillaries wall thickness, and unit is
nm；M is positive integer, represents different resonance zones；n2And n1The respectively refractive index of clad silica and core region；
By controlling the thickness of cladding capillaries wall and then the transmission belt of antiresonance negative cruvature hollow-core fiber can be designed so that pump
Pumping wavelength λ0With raman laser wavelength X1Respectively in two transmission belts of antiresonance negative cruvature hollow-core fiber, according to actual need
Will, the size of cladding capillaries and the size and number of fibre core inner capillary tube can be changed.
3. the fiber-optic fiber gas cascade Ramar laser according to claim 1 that the tuning of 3~5 mu m wavebands can be achieved, its feature
It is, the transmission spectrum of the hollow-core fiber used in first order gas Raman laser generator is met：Pump wavelength0For 1 μm,
Raman laser wavelength X1For 1.5 μm or 2 μm, pumping wavelength and raman laser wavelength are located in hollow-core fiber transmission spectrum；
The transmission spectrum of the hollow-core fiber used in the gas Raman laser generator of the second level is met：Pump wavelength0For 1.5 μm or
2 μm of person, raman laser wavelength X1For 3~5 μm, pumping wavelength and raman laser wavelength are located in hollow-core fiber transmission spectrum.
4. the fiber-optic fiber gas cascade Ramar laser according to claim 1 that the tuning of 3~5 mu m wavebands can be achieved, its feature
It is, first order Raman gas is a kind of alkanes gas or hydrogen, second level Raman gas is hydrogen or a kind of alkanes gas
Body, the alkanes gas includes methane, ethane, propane, butane, ethene etc..
5. the fiber-optic fiber gas cascade Ramar laser according to claim 1 that the tuning of 3~5 mu m wavebands can be achieved, its feature
Be, 1 mu m waveband tunable laser generation device be laser oscillator, laser amplifier, optical-fiber laser generation device, solid swash
Light generating device, pulse laser generation device or continuous laser generation device.
6. the fiber-optic fiber gas cascade Ramar laser according to claim 1 that the tuning of 3~5 mu m wavebands can be achieved, its feature
It is, the first order raman laser generation device or second level raman laser generation device are that single-pass configuration laser produces dress
Put.
7. the fiber-optic fiber gas cascade Ramar laser according to claim 6 that the tuning of 3~5 mu m wavebands can be achieved, its feature
It is, the single-pass configuration laser generator includes 1# high reflective mirrors, 2# high reflective mirrors, 1# half-waves successively along optic path direction
Piece, polarization splitting prism, 2# half-wave plates, coupled lens, input air chamber, hollow-core fiber, output end air chamber, output lens and
Filter plate；Pumping laser realizes the collimation to pumping laser, 1# half-wave plates and polarization point by 1# high reflective mirrors and 2# high reflective mirrors
The power of pumping laser after light prism collimation is controlled, and 2# half-wave plates regulation pumping laser polarization direction, coupling is saturating
Input window of the pumping laser through input air chamber is coupled in the fibre core of hollow-core fiber by mirror, and pumping laser is in hollow fibre core
Occurs the raman laser that stimulated Raman scattering effect produces one way amplification with the Raman gas filled in fibre core, then by defeated
Go out to filter out by filter plate again after collimated and raman laser is directly exported after remnant pump laser.
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| CN110556695A (en) * | 2018-06-03 | 2019-12-10 | 中国科学院大连化学物理研究所 | 2.8 micron wave band wavelength tunable laser |
| CN110556698B (en) * | 2018-06-03 | 2021-06-01 | 中国科学院大连化学物理研究所 | Large pulse energy far infrared laser, laser frequency conversion device and frequency conversion method |
| CN112186494A (en) * | 2019-07-04 | 2021-01-05 | 中国科学院大连化学物理研究所 | CO (carbon monoxide)2Cascade ultraviolet Raman laser |
| WO2021156256A2 (en) * | 2020-02-03 | 2021-08-12 | Alltec Angewandte Laserlicht Technologie Gmbh | Laser marking system and method |
| 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 |
| 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 |
| 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 |
| CN114256729B (en) * | 2020-09-22 | 2024-04-09 | 中国科学院大连化学物理研究所 | Mid-infrared Raman laser with narrow pulse width, high peak power and high average power |
| CN114336249A (en) * | 2020-10-10 | 2022-04-12 | 中国科学院大连化学物理研究所 | Raman laser for realizing wavelength precise tuning through temperature control |
| CN114552360B (en) * | 2020-11-27 | 2023-05-16 | 中国科学院大连化学物理研究所 | Mixed gas 4 mu m middle infrared band Raman laser output 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 |
| CN113675719A (en) * | 2021-07-16 | 2021-11-19 | 西安电子科技大学 | Tunable long-wave mid-infrared ultrafast laser light source device |
| CN115296132B (en) * | 2022-10-09 | 2023-02-14 | 武汉中科锐择光电科技有限公司 | High spectral purity polarization maintaining optical fiber Raman laser generation system |
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