CN109103737A - A kind of tunable middle infrared Raman optical fiber laser of broad band wavelength - Google Patents
A kind of tunable middle infrared Raman optical fiber laser of broad band wavelength Download PDFInfo
- Publication number
- CN109103737A CN109103737A CN201811287780.7A CN201811287780A CN109103737A CN 109103737 A CN109103737 A CN 109103737A CN 201811287780 A CN201811287780 A CN 201811287780A CN 109103737 A CN109103737 A CN 109103737A
- Authority
- CN
- China
- Prior art keywords
- laser
- raman
- fiber
- unit
- band
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- 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
- H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
- H01S3/06716—Fibre compositions or doping with active elements
-
- 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
- H01S3/0675—Resonators including a grating structure, e.g. distributed Bragg reflectors [DBR] or distributed feedback [DFB] fibre lasers
-
- 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
- H01S3/06754—Fibre amplifiers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
- H01S3/094042—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a fibre laser
- H01S3/094046—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a fibre laser of a Raman fibre laser
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/10007—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers
- H01S3/10023—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers by functional association of additional optical elements, e.g. filters, gratings, reflectors
-
- 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
Abstract
The invention discloses a kind of tunable middle infrared Raman optical fiber lasers of broad band wavelength, including tunable optical fiber laser unit, fiber amplifier unit, collimate coupling unit and raman laser resonator unit, raman laser resonator unit includes grating, tunable optical fiber laser unit exports the laser of default first band to fiber amplifier unit, the laser of first band is after fiber amplifier unit amplification optical power, input collimation coupling unit, it collimates coupling unit and the amplified laser coupled of optical power is inputted into raman laser resonator unit, raman laser resonator unit is based on the amplified laser of optical power, by the tilt angle for adjusting grating, output center wavelength is the raman laser of default second band., to adjust the wavelength of Ramar laser output, the application field of the laser can be greatly expanded by adjusting the tilt angle of grating since there are gratings in the raman laser resonator unit in the laser.
Description
Technical field
The present invention relates to the tunable middle infrared Raman optical fiber in Raman fiber lasers field more particularly to a kind of broad band wavelength
Laser.
Background technique
Optical fiber laser is widely used to the military, people because small in size, high-efficient, structure is simple, the advantages such as convenient for safeguarding
With equal fields.Optical-fiber laser generally can be divided into two classes by its working media: one kind be by rare-earth doped optical fibre (such as Er-doped fiber,
Yb dosed optical fiber, thulium doped fiber one or more of mix holmium optical fiber) as its gain media, generate laser generation, another kind of benefit
Laser output is generated with the nonlinear effect (such as stimulated Raman scattering, stimulated Brillouin scattering) in optical fiber.
It cannot achieve 1.1-1.25 microns, 1.6- since rare earth ion emission cross section is fixed based on rear-earth-doped optical fiber
The laser of 1.75 microns and the wave bands such as 2.1-2.3 microns.And fibre optic Raman laser is excited to draw based on what laser in optical fiber generated
Graceful scattering effect, by the energy transfer to stokes light of pumping light, the raman gain spectrum in optical fiber is often wider, operating wave
Length is extremely flexible, and high-power output easy to accomplish.Its maximum advantage is the mutability of Output of laser wavelength, can get rare earth
Ion-doped optical fiber is difficult to the wavelength obtained.Due to the flexibility of wavelength, fibre optic Raman laser is also applied more and more widely
In the every field of laser technology, for example laser radar, gas spectroscopy, medical treatment, sensing etc..Mature Raman fiber swashs at present
Light device concentrates near infrared band, but mid-infrared light fibre laser of the wavelength greater than 2.0 microns is in national defence, medical treatment, sensing and laser
The fields such as communication have important application prospect, so that middle infrared Raman optical fiber laser becomes the hot issue of current research.
The middle infrared Raman optical fiber laser of fixed wave length, such as 2.185 microns, 2.231 microns are had been carried out in laboratory at present, but
Since wavelength is single, application is limited to a certain extent.
Summary of the invention
The main purpose of the present invention is to provide a kind of tunable middle infrared Raman optical fiber lasers of broad band wavelength, can solve
The single technical problem of the wavelength of certainly middle infrared Raman optical fiber laser.
To achieve the above object, the present invention provides a kind of tunable middle infrared Raman optical fiber laser of broad band wavelength, special
Sign is that the laser includes that tunable optical fiber laser unit, fiber amplifier unit, collimation coupling unit and Raman swash
Optical cavity unit, the raman laser resonator unit includes grating；
The tunable optical fiber laser unit exports the laser of default first band to the fiber amplifier unit, institute
The laser of first band is stated after fiber amplifier unit amplification optical power, inputs the collimation coupling unit, institute
It states collimation coupling unit and the amplified laser coupled of optical power is inputted into the raman laser resonator unit, the raman laser
Resonator unit is based on the amplified laser of the optical power, by adjusting the tilt angle of the grating, output center wavelength
For the raman laser for presetting second band.
Further, the tunable optical fiber laser unit includes the first pumping source, the first bundling device, the first doping light
Fibre, the first isolator, fiber coupler and tunable optic filter；
The light of the first pumping source output and the light of tunable optic filter output are after first bundling device
It pools all the way, is successively being divided into two after first doped fiber, first isolator and the fiber coupler
Road inputs the tunable optic filter all the way, the wavelength of light is adjusted through the tunable optic filter, and in cavity circulation, another
Road exports the laser of the first band as output end.
Further, mode-locking device or Q-switching device built in the tunable optical fiber laser realize laser with pulse form
Formula output.
Further, the fiber amplifier unit includes the second pumping source, the second bundling device, the second doped fiber, pump
Pu power stripper, the second isolator and output port；
The first band of the light and tunable optical fiber laser unit output of the second pumping source output
Laser pools all the way after second bundling device, successively removes by second doped fiber, the pump power
Device and second isolator, by the amplified laser of output port Output optical power.
Further, the collimation coupling unit includes the first collimating optic, spatial light isolator and focusing optics
Device；
The amplified laser of the optical power of the fiber amplifier unit output passes through the first collimating optics device
Part carries out collimation output, and backlight is isolated by the spatial light isolator in the laser after collimation output, by the focusing light
It learns device focusing and is input to the raman laser resonator unit.
Further, the raman laser resonator unit include the first dichroic mirror, grating, the second collimating optic,
Raman fiber, the second dichroic mirror and third collimating optic, one end of the Raman fiber are that oblique angle cuts end face, the drawing
The other end of graceful optical fiber is right angle cuts end face；
The grating feeds back the first-order diffraction light of the second band by adjusting tilt angle selection, realizes Wavelength tunable
Humorous, the first-order diffraction light of feedback carries out collimation focusing by second collimating optic, anti-by first dichroic mirror
After penetrating, the oblique angle cutting end face through the Raman fiber inputs the Raman fiber, is transferred to the drawing through the Raman fiber
The right angle cuts end face of graceful optical fiber, the right angle cuts end face through the Raman fiber are reflected again into the Raman fiber, are made described
Raman laser resonant cavity is formed between grating and the right angle cuts end face of the Raman fiber, is cut at the right angle of the Raman fiber
The raman laser of cut node face output second band；
The laser of the first band of the collimation coupling unit output is after first dichroic mirror transmission, described in input
Raman laser resonant cavity, the raman laser resonant cavity exports the raman laser of the second band and to input described second double-colored
Mirror exports after third collimating optic collimation after second dichroic mirror reflection.
Further, the raman laser resonator unit further includes the first fiber clamp and the second fiber clamp；
First fiber clamp is used to clamp one end of the Raman fiber, and second fiber clamp is for clamping institute
State the other end of Raman fiber.
Further, first dichroic mirror and second dichroic mirror be vapor-deposited with the first band high transmittance film and
The high-reflecting film of the second band.
Further, the Raman fiber is quartz glass optical fiber perhaps fluoride glass fiber or chalcogenide glass
Optical fiber.
The present invention provides a kind of tunable middle infrared Raman optical fiber laser of broad band wavelength.Due to adjustable in the laser
The laser of humorous optical fiber laser unit output first band, the laser of the first band successively pass through fiber amplifier unit, standard
Raman laser resonator unit is inputted after straight coupling unit, by the inclination for adjusting the grating in the raman laser resonator unit
Angle, output center wavelength are the raman laser of second band.The central wavelength of raman laser can be with the tilt angle of grating
And change, in conjunction with tunable optical fiber laser, so that the wavelength of Ramar laser output is tunable on a large scale, can greatly expand
The application field of the laser.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those skilled in the art without creative efforts, can also basis
These attached drawings obtain other attached drawings.
Fig. 1 is a kind of structural representation of the tunable middle infrared Raman optical fiber laser of broad band wavelength in the embodiment of the present invention
Figure；
Fig. 2 is the refinement structural schematic diagram of tunable optical fiber laser unit 1 in the embodiment of the present invention；
Fig. 3 is the refinement structural schematic diagram of fiber amplifier unit 2 in the embodiment of the present invention；
Fig. 4 is the refinement structural schematic diagram that coupling unit 3 is collimated in the embodiment of the present invention；
Fig. 5 is the refinement structural schematic diagram of raman laser resonator unit 4 in the embodiment of the present invention.
Specific embodiment
In order to make the invention's purpose, features and advantages of the invention more obvious and easy to understand, below in conjunction with the present invention
Attached drawing in embodiment, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described reality
Applying example is only a part of the embodiment of the present invention, and not all embodiments.Based on the embodiments of the present invention, those skilled in the art
Member's every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
The single technical problem of wavelength since middle infrared Raman optical fiber laser exists in the prior art.
In order to solve the above-mentioned technical problem, the present invention proposes a kind of tunable middle infrared Raman optical-fiber laser of broad band wavelength
Device.Due to the laser of the tunable optical fiber laser unit output first band in the laser, the laser of the first band according to
It is secondary to input raman laser resonator unit after fiber amplifier unit, collimation coupling unit, by adjusting the raman laser
The tilt angle of grating in resonator unit, output center wavelength are the raman laser of second band.The center of raman laser
Wavelength can change with the tilt angle of grating, in conjunction with tunable optical fiber laser, so that the wavelength of laser output can
Become, the application field of the laser can be greatly expanded.
Referring to Fig. 1, for a kind of knot of the tunable middle infrared Raman optical fiber laser of broad band wavelength in the embodiment of the present invention
Structure schematic diagram.The laser includes tunable optical fiber laser unit 1, fiber amplifier unit 2, collimation coupling unit 3 and draws
Graceful laser resonator unit 4, raman laser resonator unit 4 include grating；
Tunable optical fiber laser unit 1 exports the laser of default first band to fiber amplifier unit 2, first band
Laser amplify optical power by fiber amplifier unit 2 after, input collimation coupling unit 3, collimation coupling unit 3 is by light function
The amplified laser coupled of rate inputs raman laser resonator unit 4, after raman laser resonator unit 4 is based on optical power amplification
Laser, by adjust grating tilt angle, output center wavelength be preset second band raman laser.
Preferably, the working principle and process of laser of the present invention are as follows: exported first by tunable optical fiber laser unit 1
The laser of stable first band, which can be pulse or continuously run form, and gain is situated between
Matter can be thulium doped fiber, mix holmium optical fiber or Tm Ho co doped fiber, and first band can be 2 tunable micron wavebands, wavelength
Tunable range is located in 1.85-2.1 microns；The laser of first band is injected into fiber amplifier unit 2 later, is not limited to
Level-one amplification, depending on power demand, can be amplified with cascading multiple stages, to provide sufficiently large pumping for raman laser resonator unit 4,
The fiber amplifier unit 2 can be 2 micron waveband fiber amplifiers；The laser of the first band after power amplification is led to later
It crosses collimation coupling unit 3 and is coupled into raman laser resonator unit 4, raman laser resonator unit 4 includes grating, which is
Balzed grating, or volume Bragg grating, the grating constitute raman laser resonator unit 4 with the vertical Raman fiber end face cut,
Wherein, the Raman fiber end face vertically cut can provide 4% Fresnel reflection, change incidence angle by rotating shutter, selection
1 grade of diffraction light of second band is fed back, wherein the wavelength of second band changes with the tilt angle of grating, by
It is tunable, pumping and tunable, energy as provided by the laser of the first band in the laser of first band itself
It realizes tunable on a large scale to the wavelength of Raman Stokes laser.
Further, referring to Fig. 2, the refinement structure for tunable optical fiber laser unit 1 in the embodiment of the present invention is shown
It is intended to.It is specific:
Tunable optical fiber laser unit 1 include the first pumping source 101, the first bundling device 102, the first doped fiber 103,
First isolator 104, fiber coupler 105 and tunable optic filter 106；
The light that the light and tunable optic filter 106 of the output of first pumping source 101 export converges after the first bundling device 102
At all the way, successively it is being divided into two-way after the first doped fiber 103, the first isolator 104 and fiber coupler 105, all the way
Tunable optic filter 104 is inputted, the wavelength of light is adjusted through tunable optic filter 104, and in cavity circulation, another way is as output
The laser of end output first band.
Further, mode-locking device built in tunable optical fiber laser or Q-switching device realize that laser is defeated with impulse form
Out.
Preferably, the effect of tunable optical fiber laser unit 1 is to provide pumping for raman laser resonator unit 4 to take out
Fortune realizes stimulated Raman scattering, includes tunable wave length device in tunable optical fiber laser unit 1, has tunable wave length
Characteristic, and can the operation of continuous or impulse form, to realize that laser is exported with impulse form, in tunable optical fiber laser 1
Set mode-locking device or Q-switching device.The tunable optical fiber laser unit 1 is all-fiber structure, and the first doped fiber 103 is
Thulium doped fiber mixes holmium optical fiber or Tm Ho co doped fiber, and fiber type is single covering or double clad.First pumping source 101 is
The laser of 0.8 micron waveband, perhaps for the laser of 1.0-1.3 micron waveband or be the laser of 1.5-1.8 micron waveband
Device.
Further, referring to Fig. 3, being the refinement structural schematic diagram of fiber amplifier unit 2 in the embodiment of the present invention.Tool
Body:
Fiber amplifier unit 2 includes the second pumping source 201, the second bundling device 202, the second doped fiber 203, pumping function
Rate stripper 204, the second isolator 205 and output port 206；
The laser for the first band that the light and tunable optical fiber laser unit 1 of second pumping source 201 output export, passes through
It is pooled all the way after second bundling device 202, successively by the second doped fiber 203, pump power stripper 204 and the second isolation
Device 205, by the amplified laser of 206 Output optical power of output port.
Preferably, fiber amplifier unit 2 is that the laser that tunable optical fiber laser unit 1 exports is carried out power to put
Greatly, by required power level height, it is not only limited to level-one amplification, it can cascading multiple stages amplification.Second doped fiber 203 is to mix thulium
Optical fiber, mixing holmium optical fiber, perhaps Tm Ho co doped fiber fiber type is single covering or double clad, and the second pumping source 201 is 0.8 micro-
The laser of VHF band, perhaps for the laser of 1.0-1.3 micron waveband or be the laser of 1.5-1.8 micron waveband.
Further, referring to Fig. 4, to collimate the refinement structural schematic diagram of coupling unit 3 in the embodiment of the present invention.Specifically
:
Collimating coupling unit 3 includes the first collimating optic 301, spatial light isolator 302 and focusing optics
303；
The amplified laser of optical power that fiber amplifier unit 2 exports carries out standard by the first collimating optic 301
Straight output, the laser after collimation output are isolated backlight by spatial light isolator 302, are focused by focusing optics 303
It is input to raman laser resonator unit 4.
Preferably, collimation coupling unit 3 includes collimation focusing mirror etc., and effect is the laser for exporting fiber amplifier 2
It is coupled into raman laser resonator unit 4, can optionally add pumping optoisolator.Spatial light isolator 302 is anti-for being isolated
Xiang Guang.
Further, referring to Fig. 5, being the refinement structural representation of raman laser resonator unit 4 in the embodiment of the present invention
Figure.It is specific:
Raman laser resonator unit 4 includes the first dichroic mirror 401, grating 402, the second collimating optic 403, Raman
Optical fiber 404, the second dichroic mirror 405 and third collimating optic 406, one end of Raman fiber 404 are that oblique angle cuts end face, are drawn
The other end of graceful optical fiber 404 is right angle cuts end face；
Grating 402 feeds back the first-order diffraction light of second band by adjusting tilt angle selection, realizes tunable wave length, instead
The first-order diffraction light of feedback carries out collimation focusing by the second collimating optic 403, after the reflection of the first dichroic mirror 401, warp
The oblique angle cutting end face of Raman fiber 404 inputs Raman fiber 404, and the right angle of Raman fiber 404 is transferred to through Raman fiber 404
End face is cut, the right angle cuts end face through Raman fiber 404 is reflected again into Raman fiber 404, and grating 402 and Raman fiber are made
Raman laser resonant cavity is formed between 404 right angle cuts end face, exports the second wave in the right angle cuts end face of Raman fiber 404
The raman laser of section；
The laser for the first band that coupling unit 3 exports is collimated after the transmission of the first dichroic mirror 401, inputs raman laser
Resonant cavity, raman laser resonant cavity exports the raman laser of second band and inputs the second dichroic mirror 405, by the second dichroic mirror
After 405 reflections, exported after the collimation of third collimating optic 406.
Further, raman laser resonator unit 4 further includes the first fiber clamp 407 and the second fiber clamp 408；
First fiber clamp 407 is used to clamp one end of Raman fiber 404, and the second fiber clamp 408 is for clamping Raman
The other end of optical fiber 404.
Further, the first dichroic mirror 401 and the second dichroic mirror 405 are vapor-deposited with the high transmittance film and the second wave of first band
The high-reflecting film of section.
Further, Raman fiber 404 is quartz glass optical fiber perhaps fluoride glass fiber or chalcogenide glass
Optical fiber.
Preferably, raman laser resonator unit 4 is under the action of first band tunable pump light, and realization is excited to draw
Graceful scattering effect, and amplify enhancing under the action of raman laser resonant cavity, realize raman laser output.Wherein Raman fiber
404 provide Raman gain, are not only limited to quartz material, can also be fluoride and chalcogenide glass optical fiber；Grating 402 can be to spread out
Grating or volume Bragg grating are penetrated, selects the first-order diffraction light of different wave length to be fed back by adjusting tilt angle, realizes
Tunable wave length, for providing wavelength selection and being totally reflected to Raman signal；Second collimating optic 403 is used for Raman light
While collimation, the light that grating 402 is fed back is focused；First dichroic mirror 401 is leaned on as high anti-hysteroscope, Raman fiber 404
One end of nearly first dichroic mirror 401 is that oblique angle cuts end face, is right angle cuts end face close to one end of the second dichroic mirror 405, should
Right angle cuts end face forms raman laser resonance for providing Fresnel reflection between the right angle cuts end face and grating 402
Chamber, i.e. raman laser resonant cavity are by grating 402,404 structure of the second collimating optic 403, the first dichroic mirror 401 and Raman fiber
At.Light vibrates back and forth in raman laser resonant cavity, vibrates optical path are as follows: grating 402 is by adjusting tilt angle selection feedback
The first-order diffraction light of second band, realizes tunable wave length, the first-order diffraction light of feedback by the second collimating optic 403 into
Row collimation focusing, after the reflection of the first dichroic mirror 401, the oblique angle cutting end face through Raman fiber 404 inputs Raman fiber
404, the right angle cuts end face of Raman fiber 404 is transferred to through Raman fiber 404, the right angle cuts end face through Raman fiber 404
The light after being reflected into Raman fiber 404 into Raman fiber 404 is reflected again, is reflected through the first dichroic mirror 401, by the second standard
Straight optical device 403 is input to grating 402, by grating 402 again by light emitting.Oscillation amplification is repeated several times, in Raman fiber 404
Right angle cuts end face output second band raman laser.
Further, the second dichroic mirror 405 is low anti-mirror, and raman laser resonant cavity exports the raman laser warp of second band
It crosses the reflection of the second dichroic mirror 405, export raman laser after the collimation of third collimating optic 406.First fiber clamp, 407 He
Second fiber clamp 408 has certain heat sinking function.
Realize that final tunable wave length is reached by two aspects in the present invention.On the one hand, due to tunable fiber
It include tunable wave length device, the characteristic with tunable wave length, so that the laser of the first band of output in laser element 1
It is tunable, i.e., the wavelength of the laser of the first band exported by change tunable optical fiber laser unit 1, to change
The pumping wavelength of raman laser resonator unit 4 realizes the tunable of raman laser；On the other hand, by changing grating 402
The first-order diffraction light of different wave length is fed back, can also realize the tunable wave length of raman laser, that is, exist by tilt angle, selection
Under fixed pumping wavelength, the tunable output of raman laser is also realized.Two aspects are combined, the adjustable of raman laser can be expanded significantly
Humorous range.
Theoretically, the Raman frequency shift amount δ ω of silica fibre and fluoride fiber is respectively 440cm-1And 580cm-1, there is drawing
Graceful frequency shift amount calculation formulaIn conjunction with selecting tunable fiber laser of the tunable bandwidth for 1.9-2.1 microns
Device unit 1 can get the single order Raman Stokes laser that output wavelength is 2.1-2.3 microns and export.It can overcome the disadvantages that rear-earth-doped
The deficiency of optical fiber, making up thulium doped fiber or mixing holmium optical fiber cannot achieve the deficiency that wavelength is greater than 2.1 microns, and have tunable
The advantages of, the application of the laser has been expanded significantly, so that the laser is supervised in sensing, detection of gas, biomedicine and environment
The fields such as survey have important application.
In the present embodiment, since the tunable optical fiber laser unit in the laser exports the laser of first band,
The laser of the first band successively inputs raman laser resonator unit after fiber amplifier unit, collimation coupling unit,
By adjusting the tilt angle of the grating in the raman laser resonator unit, output center wavelength is that the Raman of second band swashs
Light.The central wavelength of raman laser can change with the tilt angle of grating, so that the Wavelength variable of laser output, energy
Greatly expand the application field of the laser.
It should be noted that those skilled in the art should also know that, embodiment described in this description belongs to excellent
Embodiment is selected, related actions and modules might not all be necessary to the present invention.
It is right the above are to a kind of description of the tunable middle infrared Raman optical fiber laser of broad band wavelength provided by the present invention
In those skilled in the art, thought according to an embodiment of the present invention has change in specific embodiments and applications
Become place, to sum up, the contents of this specification are not to be construed as limiting the invention.
Claims (9)
1. a kind of tunable middle infrared Raman optical fiber laser of broad band wavelength, which is characterized in that the laser includes tunable
Optical fiber laser unit, fiber amplifier unit, collimation coupling unit and raman laser resonator unit, the raman laser are humorous
The chamber unit that shakes includes grating；
The tunable optical fiber laser unit exports the laser of default first band to the fiber amplifier unit, and described the
The laser of one wave band inputs the collimation coupling unit, the standard after fiber amplifier unit amplification optical power
The amplified laser coupled of optical power is inputted the raman laser resonator unit, the raman laser resonance by straight coupling unit
Chamber unit is based on the amplified laser of the optical power, and by adjusting the tilt angle of the grating, output center wavelength is pre-
If the raman laser of second band.
2. laser according to claim 1, which is characterized in that the tunable optical fiber laser unit includes the first pump
Pu source, the first bundling device, the first doped fiber, the first isolator, fiber coupler and tunable optic filter；
The light of the first pumping source output and the light of tunable optic filter output converge after first bundling device
At all the way, successively it is being divided into two-way after first doped fiber, first isolator and the fiber coupler, one
Road inputs the tunable optic filter, the wavelength of light is adjusted through the tunable optic filter, and in cavity circulation, another way conduct
Output end exports the laser of the first band.
3. laser according to claim 2, which is characterized in that mode-locking device built in the tunable optical fiber laser or
Person's Q-switching device realizes that laser is exported with impulse form.
4. laser according to claim 1, which is characterized in that the fiber amplifier unit include the second pumping source,
Second bundling device, the second doped fiber, pump power stripper, the second isolator and output port；
The laser of the first band of the light and tunable optical fiber laser unit output of the second pumping source output,
Pooled all the way after second bundling device, successively by second doped fiber, the pump power stripper and
Second isolator, by the amplified laser of output port Output optical power.
5. laser according to claim 1, which is characterized in that the collimation coupling unit includes the first collimating optics device
Part, spatial light isolator and focusing optics；
The amplified laser of the optical power of fiber amplifier unit output by first collimating optic into
Row collimation output, backlight is isolated by the spatial light isolator in the laser after collimation output, by the focusing optic
Part focusing is input to the raman laser resonator unit.
6. laser according to claim 1, which is characterized in that the raman laser resonator unit includes first double-colored
Mirror, grating, the second collimating optic, Raman fiber, the second dichroic mirror and third collimating optic, the Raman fiber
One end is that oblique angle cuts end face, and the other end of the Raman fiber is right angle cuts end face；
The grating feeds back the first-order diffraction light of the second band by adjusting tilt angle selection, realizes tunable wave length,
The first-order diffraction light of feedback carries out collimation focusing by second collimating optic, reflects by first dichroic mirror
Afterwards, the oblique angle cutting end face through the Raman fiber inputs the Raman fiber, is transferred to the Raman through the Raman fiber
The right angle cuts end face of optical fiber, the right angle cuts end face through the Raman fiber are reflected again into the Raman fiber, and the light is made
Raman laser resonant cavity is formed between grid and the right angle cuts end face of the Raman fiber, in the right angle cuts of the Raman fiber
The raman laser of end face output second band；
The laser of the first band of the collimation coupling unit output inputs the Raman after first dichroic mirror transmission
Laser resonator, the raman laser resonant cavity export the raman laser of the second band and input second dichroic mirror,
After second dichroic mirror reflection, exported after third collimating optic collimation.
7. laser according to claim 6, which is characterized in that the raman laser resonator unit further includes the first light
Fine fixture and the second fiber clamp；
First fiber clamp is used to clamp one end of the Raman fiber, and second fiber clamp is for clamping the drawing
The other end of graceful optical fiber.
8. laser according to claim 6, which is characterized in that first dichroic mirror and second dichroic mirror steam
It is coated with the high transmittance film of the first band and the high-reflecting film of the second band.
9. laser according to claim 6, which is characterized in that the Raman fiber is quartz glass optical fiber or fluorine
Compound glass optical fiber or chalcogenide glass optical fiber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811287780.7A CN109103737A (en) | 2018-10-31 | 2018-10-31 | A kind of tunable middle infrared Raman optical fiber laser of broad band wavelength |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811287780.7A CN109103737A (en) | 2018-10-31 | 2018-10-31 | A kind of tunable middle infrared Raman optical fiber laser of broad band wavelength |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109103737A true CN109103737A (en) | 2018-12-28 |
Family
ID=64869942
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811287780.7A Pending CN109103737A (en) | 2018-10-31 | 2018-10-31 | A kind of tunable middle infrared Raman optical fiber laser of broad band wavelength |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109103737A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113224629A (en) * | 2021-04-13 | 2021-08-06 | 华南理工大学 | Tunable single-frequency Raman laser |
| CN116759882A (en) * | 2023-08-18 | 2023-09-15 | 山东弘信光学科技有限公司 | Multi-wavelength Raman laser |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002043198A2 (en) * | 2000-11-06 | 2002-05-30 | Cidra Corporation | Tunable raman laser and amplifier |
| US20080187019A1 (en) * | 2007-02-01 | 2008-08-07 | National Central University | Volume Bragg grating laser mirror device |
| CN101859975A (en) * | 2010-06-12 | 2010-10-13 | 徐州师范大学 | Dual-wavelength tunable thulium-doped fiber laser |
| CN101859974A (en) * | 2010-06-12 | 2010-10-13 | 徐州师范大学 | Narrow linewidth thulium-doped fiber laser |
| CN102761048A (en) * | 2012-05-16 | 2012-10-31 | 中国科学院上海光学精密机械研究所 | Tunable Raman fiber laser |
| CN103928839A (en) * | 2014-04-23 | 2014-07-16 | 湖南大学 | U-waveband high-power picosecond pulse laser generating method |
| CN105390911A (en) * | 2015-10-30 | 2016-03-09 | 长春理工大学 | All-fiber 2mum-waveband dual wavelength gap-adjustable thulium-doped fiber laser |
| CN106058624A (en) * | 2016-06-29 | 2016-10-26 | 电子科技大学 | Tunable gain-control intermediate infrared pulse fiber laser and method for obtaining laser |
-
2018
- 2018-10-31 CN CN201811287780.7A patent/CN109103737A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002043198A2 (en) * | 2000-11-06 | 2002-05-30 | Cidra Corporation | Tunable raman laser and amplifier |
| US20080187019A1 (en) * | 2007-02-01 | 2008-08-07 | National Central University | Volume Bragg grating laser mirror device |
| CN101859975A (en) * | 2010-06-12 | 2010-10-13 | 徐州师范大学 | Dual-wavelength tunable thulium-doped fiber laser |
| CN101859974A (en) * | 2010-06-12 | 2010-10-13 | 徐州师范大学 | Narrow linewidth thulium-doped fiber laser |
| CN102761048A (en) * | 2012-05-16 | 2012-10-31 | 中国科学院上海光学精密机械研究所 | Tunable Raman fiber laser |
| CN103928839A (en) * | 2014-04-23 | 2014-07-16 | 湖南大学 | U-waveband high-power picosecond pulse laser generating method |
| CN105390911A (en) * | 2015-10-30 | 2016-03-09 | 长春理工大学 | All-fiber 2mum-waveband dual wavelength gap-adjustable thulium-doped fiber laser |
| CN106058624A (en) * | 2016-06-29 | 2016-10-26 | 电子科技大学 | Tunable gain-control intermediate infrared pulse fiber laser and method for obtaining laser |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113224629A (en) * | 2021-04-13 | 2021-08-06 | 华南理工大学 | Tunable single-frequency Raman laser |
| CN116759882A (en) * | 2023-08-18 | 2023-09-15 | 山东弘信光学科技有限公司 | Multi-wavelength Raman laser |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5832006A (en) | Phased array Raman laser amplifier and operating method therefor | |
| US6625180B2 (en) | Raman fiber laser | |
| US9787050B2 (en) | Tunable narrow-linewidth single-frequency linear-polarization laser device | |
| CN202183551U (en) | Single longitudinal mode and narrow line width fiber laser | |
| CN104882772B (en) | Infrared Raman optical fiber laser in a kind of dual wavelength pumping | |
| CN105591268A (en) | Large power fiber laser with inner cavity frequency doubling | |
| US20070160091A1 (en) | Continuous wave supercontinuum light source and medical diagnostic apparatus using the same | |
| CN103531994A (en) | Same-bandwidth pumping single-frequency optical fiber laser using erbium-doped quartz optical fiber as gain medium | |
| CN103236630A (en) | Single-frequency optical fiber laser using rare earth-doped quartz optical fiber as gain medium | |
| CN103825167A (en) | Continuously-tunable single-frequency optical fiber laser | |
| CN112600061A (en) | Tunable Raman fiber laser | |
| CN103151682A (en) | Anti-Strokes Raman fiber laser achieving multi-wavelength output | |
| CN109103737A (en) | A kind of tunable middle infrared Raman optical fiber laser of broad band wavelength | |
| Wu et al. | Multiwavelength ytterbium-Brillouin random Rayleigh feedback fiber laser | |
| CN103036136A (en) | Gain switch pulse type single-frequency optical fiber laser | |
| KR100767722B1 (en) | A Microwave Generator Using Optical Fiber Laser Incorporating a Ultra-narrow Bandpass Filter | |
| CN209104565U (en) | A kind of tunable middle infrared Raman optical fiber laser of broad band wavelength | |
| EP2385593A1 (en) | Fibre laser device | |
| CN102394466B (en) | All-fiber thulium-mixed laser with tunable wide brand | |
| CN103872558B (en) | All-fiber double-wavelength mid-infrared laser | |
| CN103811978A (en) | Raman optical fiber laser | |
| CN103618202B (en) | A kind of broadband light source system adopting C-band Er-doped fiber to produce C+L wave band | |
| CN106299986A (en) | A kind of all-fiber wavelength passive Q-adjusted mid-infrared fiber laser of optional dual wavelength | |
| CN109286122B (en) | Multi-band tunable single-frequency optical fiber laser | |
| CN112803233A (en) | Medium infrared laser generation method based on multi-order diamond Raman and tunable medium infrared laser |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |