CN109494564A - Multistage tunable Raman amplification method based on self similarity amplifying technique - Google Patents
Multistage tunable Raman amplification method based on self similarity amplifying technique Download PDFInfo
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- CN109494564A CN109494564A CN201811548740.3A CN201811548740A CN109494564A CN 109494564 A CN109494564 A CN 109494564A CN 201811548740 A CN201811548740 A CN 201811548740A CN 109494564 A CN109494564 A CN 109494564A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/30—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range using scattering effects, e.g. stimulated Brillouin or Raman effects
- H01S3/302—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range using scattering effects, e.g. stimulated Brillouin or Raman effects in an optical fibre
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- 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
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/13—Stabilisation of laser output parameters, e.g. frequency or amplitude
- H01S3/1305—Feedback control systems
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- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
- Automation & Control Theory (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
The present invention relates to a kind of multistage tunable Raman amplification method based on self similarity amplifying technique, laser signal sequentially enters pulse sequence selecting module and pulse compression module by multistage put after part multistage is amplified in advance, it is exported from Raman output module, Raman output module is divided into two-way for energy is exported by feedback module, spectrometer is wherein accessed all the way, repetition rate corresponding to output critical power when generating Higher-order Raman is sent back to pulse sequence selecting module as feedback signal, realizes the modulation to injected pulse repetition rate；In addition soft exchange selects optimal grating space to feed back to pulse compression module to autocorrelation function analyzer all the way, realizes Raman spectrum broadening；Final Raman output module obtains the Raman pulse output of femtosecond magnitude.The pump light with single wavelength is realized, single gain optical fiber obtains the multistage Raman pulse laser of tunable wavelength, and pulse width can reach femtosecond magnitude.
Description
Technical field
It is the present invention relates to a kind of ultrashort pulse amplifying technique, in particular to a kind of based on the more of self similarity amplifying technique
Rank is tunable Raman amplification method.
Background technique
The features such as optical fiber laser is high-efficient since its is compact-sized, good beam quality becomes current laser technology research
Hot spot.It has very extensive in numerous areas such as nanometer manufacture, substance detection, basic scientific research, industrial processes, health cares
Using.Presently ytterbium-doping optical fiber laser is the mainstream of laser system, and can be obtained using nonlinear effect in amplification process
It obtains and is exported corresponding to the multistage Raman pulse of signal light, and then realize the raman laser of a variety of wave bands.Raman fiber lasers exist
The fields such as long distance transmission, broadband, high power and signal-to-noise ratio, better than other traditional rare earth doped fiber lasers.Cause
This Raman fiber lasers is a kind of optical fiber laser that can be realized simultaneously high power and broadband output.
And there are several types of the Wideband Raman optical-fiber lasers of multi wavelength pumping for the experimental configuration of fibre optic Raman laser at present
Device, wide band high-gain dispersion compensation Raman fiber lasers, hybrid Raman optical fiber laser.However, these structures are obtained
The width of Raman pulse is all wider (magnitude of tens of picoseconds), cannot achieve the pulse output of femtosecond magnitude.However in substance
The fields such as detection, biologic medical have certain requirement to the pulse width of raman laser, need to reach femtosecond magnitude.It is existing simultaneously
Ramar laser output mostly be all single wavelength raman laser.And often in lasing material detection detection, laser doctor
The Ramar laser of the common multi wavelength pumping in treatment field then needs the pump light of multi-wavelength, wavelength-division needed for this laser
Multiplexer production is difficult, and the damage threshold of device only has several watts.Hybrid Raman laser is avoided in traditional Raman light
Need to bear high-power wavelength division multiplexer in fibre laser, combine it is traditional mix rare-earth laser and raman amplifier,
The raman laser output of kilowatt magnitude is obtained in an experiment, but such structure certainly will be huger, and with high costs.
Summary of the invention
The present invention be directed to fibre optic Raman laser there are the problem of, propose a kind of based on the more of self similarity amplifying technique
Rank is tunable Raman amplification method, realizes the pump light with single wavelength, and single gain optical fiber obtains the more of tunable wavelength
Rank Raman pulse laser, pulse width can reach femtosecond magnitude.
The technical solution of the present invention is as follows: a kind of multistage tunable Raman amplification method based on self similarity amplifying technique, swashs
Optical signal sequentially enters pulse sequence selecting module and pulse compression module by multistage put after part multistage is amplified in advance, from Raman
Output module output, Raman output module is divided into two-way for energy is exported by feedback module, wherein spectrometer is accessed all the way, it will
Repetition rate corresponding to output critical power when generating Higher-order Raman sends pulse sequence selecting module back to as feedback signal,
Realize the modulation to injected pulse repetition rate；In addition soft exchange selects optimal grating space to feed back to autocorrelation function analyzer all the way
Pulse compression module is given, realizes Raman spectrum broadening；Final Raman output module obtains the Raman pulse output of femtosecond magnitude.
The Raman output module is divided into two-way for energy is exported by feedback module, wherein access in spectrometer all the way,
Change repetition rate, observe the variation of spectral component in spectrometer, obtains critical power curve when generating Higher-order Raman, selection
For the corresponding repetition rate feedback effect of minimum critical power in the driving power in pulse sequence selecting module, driving power is defeated
Frequency signal out acts on PZT (piezoelectric transducer), and PZT (piezoelectric transducer) output action changes acousto-optic medium on acousto-optic medium
Refractive index, the final modulation realized to injected pulse repetition rate.
The laser source of the pulse sequence selecting module output enters pulse compression module, passes through half wave plate first
Afterwards, pass through above square reflector, then pass sequentially through the first grating, prism to and the second grating after, reach a piece of 0 degree
Reflecting mirror, the one of prism of prism centering are placed on the one-dimensional adjustment frame of the first electric-controlled type, and the second grating and 0 degree of reflecting mirror are put
It sets on the one-dimensional adjustment frame of the second electric-controlled type, after reflecting on the mirror, then rib pair is passed sequentially through, finally by rectangular reflection
Mirror exports laser；Autocorrelation function analyzer is according to Raman output module output spectrum and pulse width in feedback module, by adjusting two
The one-dimensional adjustment frame of electric-controlled type, observes output spectrum and pulse width, so that the identical output power the case where, analysis
Raman ingredient in spectrum, it is The more the better, while meet output pulse cannot have obvious division, pass through two one-dimensional tune of electric-controlled type
Whole frame combines the position for adjusting and obtaining optimal rib pair.
The beneficial effects of the present invention are: the present invention is based on the multistage tunable Raman amplifiction sides of self similarity amplifying technique
Method, using pulse high-peak power cause nonlinear effect, generated in amplification process multistage raman laser (Stokes and
Anti-Stokes radiation).Raman pulse obtains gain in main amplification system, simultaneously because self phase modulation, Raman spectrum
Broadening, and broader Raman spectrum can realize the compression of Raman pulse while multistage raman laser amplification process, to obtain
Obtain the Raman pulse output of femtosecond magnitude.
Detailed description of the invention
Fig. 1 is the schematic diagram of the multistage tunable Raman fiber amplification method of the present invention；
Fig. 2 is the multistage schematic diagram for putting part in advance of the present invention；
Fig. 3 is pulse sequence selecting module schematic diagram of the present invention；
Fig. 4 is pulse compression module schematic diagram of the present invention；
Fig. 5 is Raman output module schematic diagram of the present invention.
Specific embodiment
The schematic diagram of multistage tunable Raman fiber amplification method as shown in Figure 1.Signal successively passes through multistage and puts in advance
Part 100, pulse sequence selecting module 200, pulse compression module 300 and Raman output module 400, Raman output module 400
Signal is returned to pulse sequence selecting module 200 and pulse compression module 300 by feedback module 500 again by output respectively.
It is the multistage schematic diagram for putting part in advance as shown in Figure 2, laser resonator 101 can there are many selections, such as: solid
Laser system, semiconductor laser system, fiber laser system etc..102 to n be multistage amplifier section, and every grade of amplification includes one
Wavelength division multiplexer, the Yb dosed optical fiber and one or more pumping source of a certain length, wavelength division multiplexer and one are certain
The Yb dosed optical fiber of length connects, and pumping source is powered to wavelength division multiplexer.Longer polarization maintaining optical fibre can be used, accumulate certain non-thread
Property simultaneously spectrum is broadened.By multistage amplified power at 1 watt or so.
It is pulse sequence selecting module schematic diagram as shown in Figure 3,400 output signal 201 of Raman output module passes through feedback
Module 500 starts to regulate and control output critical power when generating Higher-order Raman, with the increase of repetition rate, generates high-order
Output critical power when Raman is first to subtract the process increased afterwards, and repetition rate corresponding to minimum critical power is selected to be applied to drive
On dynamic power supply 202, feedback signal is with the repetition rate signal function after original Signal averaging in piezoelectric energy-conversion in driving power 202
Device 203, and then change the variation of the refractive index of acousto-optic medium 204, the final modulation realized to injected pulse repetition rate.
It is pulse compression module schematic diagram as shown in Figure 4, after incident laser source passes through half wave plate 301, from side
The top of shape reflecting mirror 302 passes through, and then passes sequentially through grating 303, and prism after grating 306, reaches a piece of 0 to 304 and 305
Reflecting mirror 307 is spent, prism 305 is placed on the one-dimensional adjustment frame 308 of electric-controlled type, and grating 306 and reflecting mirror 307 are placed on automatically controlled
On the one-dimensional adjustment frame 309 of formula, after reflecting on the mirror, then rib pair is passed sequentially through, exports and swash finally by square reflector
Light.The distance between two gratings 303 and 306 can be modulated by electric-controlled type one-dimensional translation stage 309, and prism is to 304 and 305
Insertion can also be modulated by electric-controlled type one-dimensional translation stage 308；To change the pulsewidth of injected pulse.Electric-controlled type is one-dimensional flat
Moving stage 308 and 309 is driven by feedback module 500.By the module, Raman pulse width is compressed to hundred femtosecond magnitudes.Feedback
500 driving factors of module are the output spectrum and pulse width of 400 modules, by adjusting one-dimensional translation stage 308 and 309, to defeated
Spectrum and pulse width are observed out, i.e., the identical output power the case where, analyze the Raman ingredient in spectrum, it is more more more
It is good, while output pulse at this time cannot have obvious division, grating space is narrow in practice, pulse can be caused to divide；It is wide, it is defeated
Raman ingredient out is very few.So combining the position for obtaining optimal rib pair by the two.
It is Raman output module schematic diagram as shown in Figure 5, signal light is coupled into photon crystalline substance by focussed collimated module 401
In body optical fiber 402, in actual experiment, 402 port of photonic crystal fiber can cut out the oblique angle of a 5-10 degree.Pumping source 405
After the pump light of output passes through dichroscope 404, line focus collimation lens 403 is coupled into photonic crystal fiber, last defeated
Laser out is exported by dichroscope 404.Dichroscope 404 is the quartz glass of the equal plated film in a piece of two sides, is coated with height on one side
The deielectric-coating of saturating pump light, is coated with the deielectric-coating of high inverted signal light on one side.In an experiment, when the laser energy of output can reach
It after 1.5 watts, just will appear Higher-order Raman, after output energy reaches 2 watts, multistage Raman occur.
Raman output module 400 is divided into two-way for energy is exported by feedback module 500, wherein accessing spectrometer all the way
In, change repetition rate, observe the variation of spectral component in spectrometer, obtains critical power curve when generating Higher-order Raman,
The corresponding repetition rate of minimum critical power is selected to feed back to pulse sequence selecting module 200；In addition all the way soft exchange to from phase
Guan Yi observes the variation of its pulse, changes the spacing of rib pair, observes the variation of spectrum and pulsewidth, selects optimal grating
Spacing feeds back to pulse compression module 300.
Claims (3)
1. a kind of multistage tunable Raman amplification method based on self similarity amplifying technique, which is characterized in that laser signal passes through
Multistage put after part multistage is amplified in advance sequentially enters pulse sequence selecting module and pulse compression module, defeated from Raman output module
Out, Raman output module is divided into two-way for energy is exported by feedback module, wherein accessing spectrometer all the way, will generate high-order and draws
Repetition rate corresponding to output critical power when graceful sends pulse sequence selecting module back to as feedback signal, realizes to injection
The modulation of pulse recurrence frequency；In addition soft exchange selects optimal grating space to feed back to pulse compression to autocorrelation function analyzer all the way
Module realizes Raman spectrum broadening；Final Raman output module obtains the Raman pulse output of femtosecond magnitude.
2. the multistage tunable Raman amplification method based on self similarity amplifying technique according to claim 1, which is characterized in that
The Raman output module is divided into two-way for energy is exported by feedback module, wherein accessing in spectrometer all the way, changes and repeats
Frequency observes the variation of spectral component in spectrometer, obtains critical power curve when generating Higher-order Raman, selects minimum critical
The corresponding repetition rate feedback effect of power is in the driving power in pulse sequence selecting module, the frequency of driving power output
Signal function is on PZT (piezoelectric transducer), and PZT (piezoelectric transducer) output action is in the refractive index on acousto-optic medium, changing acousto-optic medium, most
The modulation to injected pulse repetition rate is realized eventually.
3. the multistage tunable Raman amplification method according to claim 1 or claim 2 based on self similarity amplifying technique, feature exist
In the laser source of the pulse sequence selecting module output enters pulse compression module, passes through half wave plate (301) first
Afterwards, pass through above square reflector (302), then pass sequentially through the first grating (303), prism is to (304 and 305) and
After two gratings (306), a piece of 0 degree of reflecting mirror (307) is reached, it is automatically controlled that the one of prism of prism centering (305) is placed on first
On the one-dimensional adjustment frame of formula (308), the second grating (306) and 0 degree of reflecting mirror (307) are placed on the one-dimensional adjustment frame of the second electric-controlled type
(309) on, after reflecting on the mirror, then rib is passed sequentially through to (304 and 305), it is defeated finally by square reflector (302)
Laser out；Autocorrelation function analyzer is automatically controlled by adjusting two according to Raman output module output spectrum and pulse width in feedback module
The one-dimensional adjustment frame of formula (308 and 309), observes output spectrum and pulse width, so that in the feelings of identical output power
Condition, analyze spectrum in Raman ingredient, it is The more the better, at the same meet output pulse cannot have obvious division, it is automatically controlled by two
The one-dimensional adjustment frame of formula (308 and 309), which combines to adjust, obtains optimal rib to the position of (304 and 305).
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7991022B1 (en) * | 2008-01-16 | 2011-08-02 | Calmar Optcom, Inc. | Optical pulse amplification based on stimulated Raman scattering |
| CN107024816A (en) * | 2017-04-21 | 2017-08-08 | 上海理工大学 | Higher order dispersion compensation chirp spectrum widening system |
| CN108666858A (en) * | 2018-04-24 | 2018-10-16 | 上海理工大学 | A kind of multi-wavelength femtosecond Raman fiber lasers |
| CN108963748A (en) * | 2018-06-13 | 2018-12-07 | 上海理工大学 | Multi-functional coherent Raman scattering bio-imaging light source |
-
2018
- 2018-12-18 CN CN201811548740.3A patent/CN109494564A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7991022B1 (en) * | 2008-01-16 | 2011-08-02 | Calmar Optcom, Inc. | Optical pulse amplification based on stimulated Raman scattering |
| CN107024816A (en) * | 2017-04-21 | 2017-08-08 | 上海理工大学 | Higher order dispersion compensation chirp spectrum widening system |
| CN108666858A (en) * | 2018-04-24 | 2018-10-16 | 上海理工大学 | A kind of multi-wavelength femtosecond Raman fiber lasers |
| CN108963748A (en) * | 2018-06-13 | 2018-12-07 | 上海理工大学 | Multi-functional coherent Raman scattering bio-imaging light source |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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Application publication date: 20190319 |