CN108666858A - A kind of multi-wavelength femtosecond Raman fiber lasers - Google Patents
A kind of multi-wavelength femtosecond Raman fiber lasers Download PDFInfo
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- CN108666858A CN108666858A CN201810372753.3A CN201810372753A CN108666858A CN 108666858 A CN108666858 A CN 108666858A CN 201810372753 A CN201810372753 A CN 201810372753A CN 108666858 A CN108666858 A CN 108666858A
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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
- H01S3/06754—Fibre amplifiers
- H01S3/06758—Tandem 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
- H01S3/005—Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping
- H01S3/0057—Temporal shaping, e.g. pulse compression, frequency chirping
-
- 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
-
- 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
- H01S3/11—Mode locking; Q-switching; Other giant-pulse techniques, e.g. cavity dumping
Abstract
The present invention relates to a kind of multi-wavelength femtosecond Raman fiber lasers, the nonlinear effect in optical fiber is actively utilized in the similarity pulse amplification method used, pass through the peak power of pulse in adjusting pulsewidth control unit, make main enlarging section laser that there is higher peak power, to cause Higher-order Raman effect, stretched pulse spectrum, and multistage Stokes and anti-Stokes radiation can be obtained simultaneously, realize multi-wavelength output.The final centre wavelength that produces is 1030nm, and spectral region is the femtosecond laser of 860 1330nm multi-wavelengths.In amplifying engineering in high power, each Stokes and anti-Stokes radiation have higher-strength.Therefore, the laser of obtained each wavelength also has the time width of ultrahigh peak power, wider spectral width and femtosecond magnitude.And these are also the advantage not available for other multiple-wavelength lasers.
Description
Technical field
The present invention relates to a kind of laser, more particularly to a kind of multi-wavelength femtosecond Raman fiber lasers.
Background technology
Current optical fiber laser because of the features such as it is for optical fibre device good compatibility, good beam quality, relatively low cost,
The development convexity of laser shows particularly important status.And multi-wavelength optical fiber laser can export multi-wavelength as one kind and swash
The light source of light has a wide range of applications in optical fiber transmission, optical detection and optical fiber telecommunications system etc..It is ultrafast
Have single pulse energy high if optical fiber laser such as femto second optical fiber laser, more advantages such as heat-affected zone is small.Therefore more
Apply in each fields such as micro-nano technology, medical operating device, super-resolution imaging, mid and far infrared remote sensing.Currently, the country can
Realize that the ultrafast optical fiber laser report of the high-energy of multi-wavelength output is seldom, therefore the exploitation of multi-wavelength femto-second laser also seems
It is even more important.
The structure of multi-wavelength optical fiber laser is varied at present, and the method for realizing multi-wavelength output is also how different.It is existing
Some methods have realizes that multi-wavelength exports using general at present using phase-modulator or frequency shifter.Linear cavity structure carries out grade
Connection, it is more to realize single fiber by polarization-preserving sampling optical fiber optical grating and multiple broadband fiber gratings and multistage Active Optical Fiber interconnection
Wavelength laser exports.Or designed using special multicore Active Optical Fiber, to realize the side such as parallel way or conical fiber
Formula come realize multi-wavelength export.Existing means have respective limitation.The multi-wavelength realized by phase-modulator or frequency shifter
Output cannot achieve the output of femtosecond magnitude short pulse.Existing method sets the arrangement of various fiber gratings and special original paper
Meter cost itself is higher, thereby increases and it is possible to capacity usage ratio can be caused low, export the problems such as laser power is not high.
Invention content
The present invention be directed to optical fiber femtosecond lasers to be carried the problem of multiple wavelength realize ultrashort pulse output respectively
Go out a kind of multi-wavelength femtosecond Raman fiber lasers, realizes the femtosecond laser output of high power multi-wavelength.
The technical scheme is that：A kind of multi-wavelength femtosecond Raman fiber lasers, the laser that signal transmits successively shake
It swings portion, pre-amplification portion, pulse-width controlled portion and main enlarging section and compression unit, seed light is sent out by laser oscillating part, importing is put in advance
In big portion, pre-amplification portion amplifies for multi-stage cascade, after output enters pulse-width controlled portion progress Pulse Compression after the multistage amplification of realization,
Self phase modulation is generated in the main enlarging section photonic crystal fiber being output in main enlarging section and compression unit, obtains multi-wavelength
High power laser light enter back into laser of the compressing section compresses in main enlarging section and compression unit at femtosecond magnitude, the more waves of final output
Long femtosecond laser.
The multi-stage cascade amplification is connected in series by multistage identical enlarging section, includes connecting successively per level-one Cascaded amplification portion
Isolator, light wavelength division multiplexing, doped fiber and the pump arrangement that pump light is provided to light wavelength division multiplexing connect.
The multi-stage cascade enlarging section further includes increasing acousto-optic modulator, to modulate the repetition rate of output light.
The pulse-width controlled portion includes the first lens, the first speculum, the second speculum, the first half wave plate, arteries and veins
Wide control unit optoisolator, the second half wave plate, third speculum, diffraction grating pair, the 4th speculum and the 5th is instead
Penetrate mirror；
After laser is by the first lens focus, pass sequentially through the first speculum and the reflection of the second speculum using the one or two/
After one wave plate after the isolation of pulse-width controlled portion optoisolator, by the second half wave plate, third speculum is bypassed, by spreading out
Grating is penetrated to being compressed to pulsewidth, the laser after compressed is reflected by third speculum, the 4th speculum through diffraction grating
Diffraction grating is returned to making laser obtain two second compressions, compressed laser becomes owner of amplification and pressure by the reflection of the 5th speculum is laggard
In contracting portion.
The main amplification and compression unit include the second lens, photonic crystal fiber, the first dichroscope, pumping source, third
Lens, the 6th speculum, third half wave plate, the 7th speculum, transmission grating pair, the 8th speculum and the 9th reflection
Mirror；
The light of pulse-width controlled portion output is focused by the second lens on light beam, makes laser coupled into photonic crystal fiber, main
Pump energy needed for photonic crystal fiber is provided by pumping source in amplification and compression unit, after pump light is focused by the third lens, is worn
Through the first dichroscope, coupling is squeezed into photonic crystal fiber fibre core, in the photonic crystal fiber corresponding to main enlarging section,
The laser of very high peak power generates self phase modulation in photonic crystal fiber, multistage to being generated while laser amplifier
Stokes and anti-Stokes radiation most obtain the high power laser light of multi-wavelength；Photonic crystal fiber outgoing laser via
Output light is imported into compression section after first dichroscope, the reflection of the 6th speculum, after being introduced into third half wave plate, around
The 7th speculum is crossed, diffraction grating is output to the laser after compressed is reflected by the 8th speculum and return to diffraction grating pair, pressure
After reaching the laser of femtosecond magnitude after contracting by the 7th speculum, the reflection of the 9th speculum, final output multi-wavelength femtosecond laser.
The beneficial effects of the present invention are：Multi-wavelength femtosecond Raman fiber lasers of the present invention, the similarity pulse used
The nonlinear effect in optical fiber is actively utilized in amplification method, by the peak power of pulse in adjusting pulsewidth control unit, makes master
Enlarging section laser has higher peak power, to cause Higher-order Raman effect, stretched pulse spectrum, and can obtain simultaneously
Multi-wavelength output is realized in multistage Stokes and anti-Stokes radiation.The final centre wavelength that produces is 1030nm, spectrum model
It encloses for the femtosecond laser of 860-1330nm multi-wavelengths.In amplifying engineering in high power, each Stokes and anti-stoke
This radiation has higher-strength.Therefore, the laser of obtained each wavelength also has ultrahigh peak power, wider spectral width
The time width of degree and femtosecond magnitude.And these are also the advantage not available for other multiple-wavelength lasers.
Description of the drawings
Fig. 1 is the structural schematic diagram of multi-wavelength femto-second laser of the present invention；
Fig. 2 is the structural schematic diagram in pre-amplification portion of the present invention；
Fig. 3 is the structural schematic diagram in pulse-width controlled portion of the present invention；
Fig. 4 is the structural schematic diagram of the main amplification of the present invention and compression unit.
Specific implementation mode
The structural schematic diagram of multi-wavelength femto-second laser as shown in Figure 1, the laser oscillating part 100 that signal transmits successively（Kind
Sub-light source part）, pre-amplification portion 200, pulse-width controlled portion 300, main enlarging section and compression unit 400.
The structural schematic diagram in pre-amplification portion as shown in Figure 2, pre-amplification portion 200 are that multi-stage cascade puts portion.Multi-stage cascade amplifies
Portion can be divided into first order Cascaded amplification part, second level Cascaded amplification portion to N grades of Cascaded amplification portions.The first order cascade is put
Big portion, including sequentially connected first optoisolator 201, the first light wavelength division multiplexing 202, the first doped fiber 204 and give
First light wavelength division multiplexing 202 provides the pump arrangement 203 of pump light, and one or more pumps can be used in the pump arrangement 203
Pu source.Equally, the second level to N grades of Cascaded amplification portions, per level-one Cascaded amplification portion all include respective wavelength division multiplexer (206,
211), optoisolator (205,209), pump arrangement (207,210), doped fiber (212).
Seed light is sent out by oscillating portion 100, is imported in pre-amplification portion.Amplify for multi-stage cascade in pre-amplification portion.Seed optical fiber
Into in first order pre-amplification portion.In first order pre-amplification portion, pump arrangement 203 is imported by the first wavelength division multiplexer 202
First gain fibre 204 pumps, and seed light is made to obtain gain.Thereafter Cascaded amplification constructions at different levels are similar with the first order, and laser exists
It is at different levels to amplify corresponding gain fibre（Such as 212）In, and pumping light action acquisition gain, to realize multistage amplification.Each
Isolator is added before portion in grade pre-amplification, to protect front light path.More, we can increase acousto-optic tune in multistage pre-amplification
Device (AOM) processed, to modulate the repetition rate of output light.Afterbody pre-amplification portion uses double clad gain fibre in the present embodiment
Amplification, but be not limited only to use such optical fiber.Thereafter laser imports pulse-width controlled portion.
Fig. 3 is the structural schematic diagram in pulse-width controlled portion of the present invention, and pulse-width controlled portion includes mainly with lower component：First lens
301, the first speculum 302, the second speculum 303, the first half wave plate 304, pulse-width controlled portion optoisolator 305, the
Two half wave plates 306, third speculum 307, diffraction grating pair 308 and 309, the 4th speculum 310, the 5th speculum
311。
After laser is focused by the first lens 301, the first speculum 302 and the reflection of the second speculum 303 are passed sequentially through again
After the first half wave plate 304 after the isolation of pulse-width controlled portion optoisolator 305, pass through the second half wave plate
306, bypass third speculum 307（Third speculum 307 is D type speculums, and laser can lead to above speculum from left to right
It crosses）, compressed by diffraction grating pair 308 and 309 pairs of pulsewidths, laser made to obtain high-peak power, to realize in photonic crystal
Self similarity gain amplifier in optical fiber makes compression pulse width to laser in diffraction grating to the second half wave plate 306 of preceding setting
Depletion efficiency it is minimum, the laser after compressed is reflected by the 4th speculum 310 through diffraction grating and returns to diffraction grating pair 309
Laser is set to obtain the effect of two second compressions with 308, after compressed laser is reflected by third speculum 307, the 5th speculum 311
Into in main amplification and compression unit.
Such as the structural schematic diagram that Fig. 4 is the main amplification of the present invention and compression unit, main amplification and compression unit include mainly with lower part
Part, the second lens 401, photonic crystal fiber 402, the first dichroscope 403, pumping source 404, the third lens 405, the 6th reflection
Mirror 406, third half wave plate 407, the 7th speculum 408, transmission grating pair 409 and 410, the 8th speculum 411, the 9th
Speculum 412.
The light of pulse-width controlled portion output is focused light beam by the second lens 401, makes laser coupled into photonic crystal
Optical fiber 402, pump energy needed for photonic crystal fiber 402 is provided by pumping source 405 in main amplification and compression unit, and pump light is by the
After three lens 404 focus, it is perforated through the first dichroscope 403,（This mirror be dichroscope, dichroscope double-sided coating, as figure from
The left highly transmissive 980nm light of dextrad（Pump light）, left-hand right direction high reflection 1030nm laser）, couple and squeeze into photonic crystal fiber
In 402 fibre cores.
In photonic crystal fiber 402 corresponding to main enlarging section, the laser of very high peak power is in photonic crystal fiber
Middle generation self phase modulation is most obtained to generating multistage Stokes and anti-Stokes radiation while laser amplifier
The high power laser light of multi-wavelength.The laser that photonic crystal fiber 402 is emitted is anti-via the first dichroscope, the 6th speculum 406
Output light is imported into compression section after penetrating.The laser generated to main amplification via the similar system of above-mentioned laser compression unit compresses,
Third half wave plate 407 is set before diffraction grating pair 409 and 410, bypasses the 7th speculum 408（7th speculum 408
Also it is D type speculums, light can pass through above speculum from left to right）, laser through diffraction grating to the laser after compressed by
The reflection of 8th speculum 411 returns to diffraction grating pair 410 and 409, and the laser of femtosecond magnitude is reached after compression by the 7th speculum
408, after the reflection of the 9th speculum 412, final output multi-wavelength femtosecond laser.
In the present embodiment in main amplification and compression unit, method that institute's compression unit uses is to use grating to compressing arteries and veins to laser
Width, and final output femtosecond laser.In the present invention, other compression methods, such as bragg grating and prism equity
Method equally may be implemented.
Doped fiber, doubly clad optical fiber, the PCF used in the embodiment is Yb-doped fiber, but the present invention is practical makes
It is not limited only to this in.
Claims (5)
1. a kind of multi-wavelength femtosecond Raman fiber lasers, which is characterized in that laser oscillating part that signal transmits successively, pre-amplification
Portion, pulse-width controlled portion and main enlarging section and compression unit, seed light are sent out by laser oscillating part, are imported in pre-amplification portion, are put in advance
Big portion amplifies for multi-stage cascade, after output enters pulse-width controlled portion progress Pulse Compression after the multistage amplification of realization, is output to master and puts
Self phase modulation is generated in main enlarging section photonic crystal fiber in big portion and compression unit, the high power for obtaining multi-wavelength swashs
Light enters back into laser of the compressing section compresses in main enlarging section and compression unit at femtosecond magnitude, and final output multi-wavelength femtosecond swashs
Light.
2. multi-wavelength femtosecond Raman fiber lasers according to claim 1, which is characterized in that multi-stage cascade amplification by
Multistage identical enlarging section is connected in series, and includes sequentially connected isolator, light wavelength division multiplexing, mixes per level-one Cascaded amplification portion
Veiling glare is fine and the pump arrangement of pump light is provided to light wavelength division multiplexing.
3. multi-wavelength femtosecond Raman fiber lasers according to claim 2, which is characterized in that the multi-stage cascade enlarging section
Further include increasing acousto-optic modulator, to modulate the repetition rate of output light.
4. according to any one of claims 1 to 3 multi-wavelength femtosecond Raman fiber lasers, which is characterized in that described
Pulse-width controlled portion include the first lens, the first speculum, the second speculum, the first half wave plate, pulse-width controlled portion light every
From device, the second half wave plate, third speculum, diffraction grating pair, the 4th speculum and the 5th speculum；
After laser is by the first lens focus, pass sequentially through the first speculum and the reflection of the second speculum using the one or two/
After one wave plate after the isolation of pulse-width controlled portion optoisolator, by the second half wave plate, third speculum is bypassed, by spreading out
Grating is penetrated to being compressed to pulsewidth, the laser after compressed is reflected by third speculum, the 4th speculum through diffraction grating
Diffraction grating is returned to making laser obtain two second compressions, compressed laser becomes owner of amplification and pressure by the reflection of the 5th speculum is laggard
In contracting portion.
5. multi-wavelength femtosecond Raman fiber lasers according to claim 4, which is characterized in that the main amplification and compression unit
Including the second lens, photonic crystal fiber, the first dichroscope, pumping source, the third lens, the 6th speculum, the three or two/
One wave plate, the 7th speculum, transmission grating pair, the 8th speculum and the 9th speculum；
The light of pulse-width controlled portion output is focused by the second lens on light beam, makes laser coupled into photonic crystal fiber, main
Pump energy needed for photonic crystal fiber is provided by pumping source in amplification and compression unit, after pump light is focused by the third lens, is worn
Through the first dichroscope, coupling is squeezed into photonic crystal fiber fibre core, in the photonic crystal fiber corresponding to main enlarging section,
The laser of very high peak power generates self phase modulation in photonic crystal fiber, multistage to being generated while laser amplifier
Stokes and anti-Stokes radiation most obtain the high power laser light of multi-wavelength；Photonic crystal fiber outgoing laser via
Output light is imported into compression section after first dichroscope, the reflection of the 6th speculum, after being introduced into third half wave plate, around
The 7th speculum is crossed, diffraction grating is output to the laser after compressed is reflected by the 8th speculum and return to diffraction grating pair, pressure
After reaching the laser of femtosecond magnitude after contracting by the 7th speculum, the reflection of the 9th speculum, final output multi-wavelength femtosecond laser.
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| CN201810372753.3A CN108666858A (en) | 2018-04-24 | 2018-04-24 | A kind of multi-wavelength femtosecond Raman fiber lasers |
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| CN201810372753.3A CN108666858A (en) | 2018-04-24 | 2018-04-24 | A kind of multi-wavelength femtosecond Raman fiber lasers |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109494564A (en) * | 2018-12-18 | 2019-03-19 | 上海理工大学 | Multistage tunable Raman amplification method based on self similarity amplifying technique |
| CN109787077A (en) * | 2019-02-26 | 2019-05-21 | 上海理工大学 | Tunable multi-wavelength femtosecond light comb light source based on raman gain fiber |
| CN110739601A (en) * | 2019-10-14 | 2020-01-31 | 华东师范大学重庆研究院 | tunable ultrashort pulse fiber laser based on fiber high-order Raman effect |
| CN113437620A (en) * | 2021-06-25 | 2021-09-24 | 重庆邮电大学 | Terahertz wave frequency adjusting system based on BBO crystal and pump pulse energy |
| CN113451874A (en) * | 2020-03-27 | 2021-09-28 | 株式会社爱德万测试 | Laser output device |
| WO2021243435A1 (en) * | 2020-06-03 | 2021-12-09 | Mpb Communications Inc. | Femtosecond laser source and multiphoton microscope |
| CN116544761A (en) * | 2023-07-06 | 2023-08-04 | 广东省新兴激光等离子体技术研究院 | System for producing compressible coherent Raman pulse fiber laser |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109494564A (en) * | 2018-12-18 | 2019-03-19 | 上海理工大学 | Multistage tunable Raman amplification method based on self similarity amplifying technique |
| CN109787077A (en) * | 2019-02-26 | 2019-05-21 | 上海理工大学 | Tunable multi-wavelength femtosecond light comb light source based on raman gain fiber |
| CN110739601A (en) * | 2019-10-14 | 2020-01-31 | 华东师范大学重庆研究院 | tunable ultrashort pulse fiber laser based on fiber high-order Raman effect |
| CN113451874A (en) * | 2020-03-27 | 2021-09-28 | 株式会社爱德万测试 | Laser output device |
| CN113451874B (en) * | 2020-03-27 | 2024-03-26 | 株式会社爱德万测试 | Laser output device |
| WO2021243435A1 (en) * | 2020-06-03 | 2021-12-09 | Mpb Communications Inc. | Femtosecond laser source and multiphoton microscope |
| CN113437620A (en) * | 2021-06-25 | 2021-09-24 | 重庆邮电大学 | Terahertz wave frequency adjusting system based on BBO crystal and pump pulse energy |
| CN116544761A (en) * | 2023-07-06 | 2023-08-04 | 广东省新兴激光等离子体技术研究院 | System for producing compressible coherent Raman pulse fiber laser |
| CN116544761B (en) * | 2023-07-06 | 2023-09-22 | 广东省新兴激光等离子体技术研究院 | System for producing compressible coherent Raman pulse fiber laser |
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