CN109787077A - Tunable multi-wavelength femtosecond light comb light source based on raman gain fiber - Google Patents
Tunable multi-wavelength femtosecond light comb light source based on raman gain fiber Download PDFInfo
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- CN109787077A CN109787077A CN201910140597.2A CN201910140597A CN109787077A CN 109787077 A CN109787077 A CN 109787077A CN 201910140597 A CN201910140597 A CN 201910140597A CN 109787077 A CN109787077 A CN 109787077A
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- 229920006395 saturated elastomer Polymers 0.000 claims description 6
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- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000747 cardiac effect Effects 0.000 description 1
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- NAWDYIZEMPQZHO-UHFFFAOYSA-N ytterbium Chemical compound [Yb] NAWDYIZEMPQZHO-UHFFFAOYSA-N 0.000 description 1
Abstract
The present invention relates to a kind of tunable multi-wavelength femtosecond light comb light source based on raman gain fiber, the seed light of seed source oscillator output is successively by cascade preamplifier system amplification, pulse width control system modulation seed light single pulse energy, main amplification and compressibility output include the broadband femtosecond light comb including seed light and multiple Ramans, femtosecond light comb exports the high power femtosecond light comb of repetition rate accurate lock between each wave band by frequency dividing and multiband repetition rate locking system, and it divides and multiband repetition rate locking system output beat signal enters feedback control module, feedback control module outputs a control signal to seed source oscillator, pulse width control system and main amplification and Pulse Compression system realize frequency stabilization.The femtosecond light comb of multiple wave bands is formed using high power femtosecond photonic crystal fiber Raman gain, and by frequency dividing and feedback system, realizes the accurate lock of each frequency component.Only a light comb light source just meets the needs of broadband light comb detection.
Description
Technical field
The present invention relates to a kind of femtosecond light comb light source, in particular to a kind of tunable multi-wavelength based on raman gain fiber
Femtosecond light comb light source.
Background technique
Highly sensitive substance real-time detection is usually realized by laser, and two beam laser pulses are usually acted on unknown material table
Face, doing delayed sweep can get unknown material frequency spectrum, so that it is determined that unknown material component.Different from chemical means, this way it is excellent
Gesture is that the detection means based on laser delayed sweep without pretreatment, can be accurately positioned unknown unknown material in several minutes
Object component.However in real process, usually exists and need the case where more rapidly positioning unknown material component, such as a large amount of mailbag sieves
It looks into, customs's luggage security check or explosive, hazardous material detection.Above-mentioned scene generally requires to realize within the shorter time unknown
Object positioning.Spectrum measurement based on multiple femtosecond laser frequency combs (light comb) is a kind of outstanding alternative means, can be shorter
Realized within time (≤5 seconds) accurate positioning of unknown material.Light comb is by a kind of pulse width in femtosecond magnitude, stability height, repetition
Frequency can accurate control light source, frequency spectrum is made of a series of equal spectrum line of frequency intervals, and each frequency interval, which is equal to, to fly
The repetition rate of pulse per second (PPS) laser.Frequency spectrum detection system based on femtosecond light comb, it is only necessary to scan two adjacent arteries and veins in light comb
Time interval between punching, therefore only need several seconds table that can realize the compound mensuration of many kinds of substance.Therefore femtosecond light comb is being endangered
Quickly checking chip preparation, chemicals quickly identify etc. that application prospect is extensive for dangerous product real-time detection, medical treatment.
However for a femtosecond light comb substance detection system, since it uses light comb as detection light source, separate unit femtosecond
Light comb light source output spectral region is limited (spectral width≤50nm), and light comb substance detection system can only detect absorption spectrum and exist
Substance in its light comb light source output spectral range.Therefore in actual contents detection process, more output spectrums are generally required
Femtosecond light comb light source linkage in different frequency range, obtains broadband output, provides light source for light comb substance detection system.Each
Femtosecond light comb light source provides the substance spectrum information within the scope of respective output spectrum, constitutes entire substance frequency spectrum in this way
Picture mosaic.Therefore actually detected process is needed using more light comb femtosecond light sources, higher cost；More femtosecond light comb light sources must simultaneously
Cumbersome time-release cryptography lock pulse timing must be aided with, it is necessary to the weight of accurate " feedback → synchronization " more femtosecond light comb light sources
Complex frequency, the optical path of the long locking system of existing femtosecond light comb feedback synchronization chamber, circuit part are complicated, and latch-up sensitivity compared with
Difference.Therefore, because not having the tunable light comb light source of multiband, existing femtosecond light comb frequency spectrum detection system disadvantage is obvious.
Summary of the invention
The present invention be directed to the problems that separate unit femtosecond light comb light source output spectral region is limited, propose a kind of based on optical fiber
The tunable multi-wavelength femtosecond light comb light source of Raman gain is that repetition rate is accurately locked between a kind of output of multiband, each wave band
Fixed high power femtosecond light comb forms the femtosecond light comb of multiple wave bands using high power femtosecond photonic crystal fiber Raman gain,
And by frequency dividing and feedback system, the accurate lock for each frequency component that it is included is realized, can be used for light comb height to constitute
The tunable multi-wavelength femtosecond light comb light source of fast spectrum analysis.
The technical solution of the present invention is as follows: a kind of tunable multi-wavelength femtosecond light comb light source based on raman gain fiber, kind
The seed light of component oscillator output successively amplifies by cascade preamplifier system, is entered pulse width control system modulation kind again
Sub-light single pulse energy, output seed light include the width including seed light and multiple Ramans by main amplification and compressibility output
Wave band femtosecond light comb, femtosecond light comb export repetition rate essence between each wave band by frequency dividing and multiband repetition rate locking system
The high power femtosecond light comb really locked, and frequency dividing and multiband repetition rate locking system output beat signal enter feedback control
Molding block, feedback control module output a control signal to seed source oscillator, pulse width control system and main amplification and pulsewidth
Compressibility realizes frequency stabilization.
The seed source oscillator is saturated absorbing body mode locking annular chamber, and coupling pump light is into wavelength division multiplexer, wavelength-division
Multiplexer output light successively passes through Yb dosed optical fiber, piezoelectric ceramics, saturated absorbing body, coupler, fibre optic isolater, and to return to wavelength-division multiple
With in device, coupler does not connect another port output seed light of annular chamber；Feedback control module output signal modulating oscillator
In Yb dosed optical fiber length, the repetition rate of seed light is adjusted with this；Feedback control module output signal adjusts piezoelectric ceramics electricity
Pressure is with the repetition rate of this precision locking seed light.
The high power femtosecond light comb for being incident on frequency dividing and multiband repetition rate locking system is via reflecting mirror and gathers
Focus lens are collimated into directional light, reflect seed light using the first dichroscope in system, the seed light reflected, which passes through, is
First half wave plate in system is incident on the first polarization splitting prism and is divided, the first polarization splitting prism reflected light with
Oscillograph is connected, and the first polarization splitting prism transmitted light is collected into the first photoelectric probe, and seed light comb signal passes through first
The electric signal corresponding to it is converted to after photoelectric probe is output to frequency spectrograph；
The transmitted light of first dichroscope is successively reflected by several dichroscopes, what several dichroscopes reflected
Several Raman lights pass through half wave plate and polarization splitting prism in respective optical path respectively, and polarization splitting prism reflected light is defeated
Oscillograph is arrived out, and polarization splitting prism transmitted light respectively enters respective photoelectric probe and is collected, and photoelectric probe turns Raman light comb
It changes its corresponding electric signal into, then signal modulation, modulated drawing is carried out by respective time delay module, amplifier respectively
Graceful electric signal is sent into frequency spectrograph, realizes beat frequency detection；Frequency spectrograph outputs signals to feedback control module.
The beneficial effects of the present invention are: the present invention is based on the tunable multi-wavelength femtosecond light comb light of raman gain fiber
Source, the light comb light-source system are lifted at the peak value of seed laser in main amplification photonic crystal fiber by self similarity amplifying technique
Power, to excite broadband Raman gain, constitute covering 500-1300nm broadband Raman light comb (spectral width >=
700nm).The wave band covers the emission spectrum range of most of organic molecule.Therefore it is different from traditional light comb frequency spectrograph
Light-source system utilizes more light comb light source linkage measurement unknown materials；As soon as the light comb light source it is only necessary to an above-mentioned light comb light source,
The needs of broadband light comb detection system are able to satisfy, realize the measurement of most organic molecule.Under current international background, the production
Product are particularly important for the notch of quick security product for filling up market.
Detailed description of the invention
Fig. 1 is that the present invention is based on the tunable multi-wavelength femtosecond light comb light-source structure schematic diagrames of raman gain fiber；
Fig. 2 is femtosecond oscillator structural schematic diagram of the present invention；
Fig. 3 is present invention cascade preamplifier system structural schematic diagram；
Fig. 4 is pulse width control system structure diagram of the present invention；
Fig. 5 is the main amplification of the present invention and Pulse Compression system structure diagram；
Fig. 6 is present invention frequency dividing and multiband repetition rate locking system structural schematic diagram.
Specific embodiment
Tunable multi-wavelength light comb light-source structure block diagram based on raman gain fiber as shown in Figure 1, laser is in optical fiber system
From seed source oscillation 100, cascade preamplifier system 200, pulse width control system 300, main amplification and compressibility in system
400, frequency dividing and multiband repetition rate locking system 500 are successively propagated, and realize frequency stabilization by feedback control module 600.
It is illustrated in figure 2 100 structural schematic diagram of femtosecond oscillator.This example femtosecond oscillator is saturated absorbing body mode locking ring
Shape chamber, pump light 201 are coupled in wavelength division multiplexer 202, and the output end of wavelength division multiplexer 202 is connected with Yb dosed optical fiber 203, mix
The output end of ytterbium optical fiber 203 is connected with piezoelectric ceramics 204, and the output end of piezoelectric ceramics 204 is connected with saturated absorbing body 205, satisfies
It is connected with the output end of absorber 205 with coupler 206, another port of coupler 206 is connected with fibre optic isolater 207,
Fibre optic isolater 207 is connected with another input terminal of wavelength division multiplexer 202, another port of coupler 206 exports seed light.
It is illustrated in figure 3 cascade 200 structural schematic diagram of preamplifier system.Every grade of preamplifier system structure is identical, simple herein
State N grades of preamplifier systems: in first order preamplifier system, the seed light of seed source oscillation chamber output successively passes through isolator
301, wavelength division multiplexer 303, Yb dosed optical fiber 304 export, and wherein pump light 302 is coupled in wavelength division multiplexer 303；The first order is pre-
The seed light of amplification system is the output light of seed source oscillatory system, and the seed light of second level preamplifier system is that the first order is put in advance
The output light of big system, and so on.Optoisolator in every grade of preamplifier system can ensure that the one-way transmission of light in systems,
Prevent reversed laser from damaging to laser system.
Fig. 4 show 300 structural schematic diagram of pulse width control system, cascades preamplifier system output end and pulse width
Control system input terminal is connected.Since the seed light of cascade preamplifier system output is easier to dissipate, by by condenser lens
401, the Space Collimation system that reflecting mirror 402, reflecting mirror 403 and condenser lens 404 form, seed light is collimated as directional light；
After the output light of convergent lens 404 passes sequentially through half wave plate 405, isolator 406, half wave plate 407, pass through
The top incident transmission of dichroscope 410 to grating in 408, through grating to 408 compressed laser beams in zero degree high reflective mirror
Grating is again incident under 409 effects in 408, grating is to 408 emergent lights by the reflection output of dichroscope 410；Laser warp
It is modulated after twice, single pulse energy is greatly improved, and seed light is emitted by dichroscope 410.Meanwhile grating to 408 it
Between spacing by feedback system 600 control.Since the spectral region that main amplification and Pulse Compression system 400 export is wide by pulse
The influence of 300 output pulse width of control system is spent, therefore by feedback system by adjusting grating to the distance between 408, in turn
Tune the spectral region of final Raman output.
Amplification and 400 structural schematic diagram of Pulse Compression system based on shown in Fig. 5.501 pulse-width of reflecting mirror control system
System 300 output laser alignments, thereafter laser successively pass through half wave plate 502, isolator 503, half wave plate 504,
Condenser lens 505 is coupled in photonic crystal fiber 506.510 line focus lens 509 of pump light, semi-transparent semi-reflecting lens 508 transmission and
Condenser lens 507 is coupled in photonic crystal fiber 506；Seed light and pump light propagate phase in photonic crystal fiber 506
Interaction excites the Raman gain in photonic crystal fiber, to form multistage Stokes and anti-Stokes radiation.Kind
Sub-light and multistage raman laser line focus lens 507 are reflected by semi-transparent semi-reflecting lens 508 is input to compressibility.Semi-transparent semi-reflecting lens
508 reflected laser pulses are incident on after half wave plate 511, condenser lens 512, dichroscope 515 in compressibility
Transmission-type grating is to 513；Via transmission-type grating to 513 compressed laser pulses zero degree high reflective mirror 514 effect under, again
It by grating to 513, is finally reflected by dichroscope 515, output includes the broadband femtosecond including seed light and multiple Ramans
Light comb.
It is as shown in Figure 6 frequency dividing and 500 structural schematic diagram of multiband repetition rate locking system.It is incident on frequency dividing and multifrequency
The pulse laser of section repetition rate locking system is collimated into directional light via reflecting mirror 601,602 and condenser lens 603,604.Arteries and veins
Impulse light reflects 1030 seed lasers, reflects using central wavelength 1030nm, the dichroscope 605 of pulsewidth 50nm
1030 seed lights are incident on polarization splitting prism 607 and are divided by half wave plate 606,607 reflected lights and oscillograph
613 are connected, and it is collected that 607 transmitted lights enter photoelectric probe 608.It is right that 608 seed light comb signal is converted to its institute after 608
The electric signal answered, 608 output end are connected with the input terminal of frequency spectrograph 611.
The transmitted light of dichroscope 605 includes second order raman laser (N=2,930nm, 980nm), is successively passed through
The progress of dichroscope 6052 of the long 900nm of cardiac wave, the dichroscope 6051 of pulsewidth 50nm and central wavelength 980nm, pulsewidth 50nm
Reflection, 930nm, 980nm Raman light reflected pass through half wave plate 6061,6062 respectively and are incident on polarization splitting prism
6071,6072.The reflected light of half wave plate 6071,6072 is connected with oscillograph 613 respectively, and transmitted light respectively enters light
Electric probe 6081,6082 is collected.6081,6082 Raman light comb is converted into its corresponding electric signal, then passes through the time respectively
Postponement module 6091,6092, amplifier 6101,6102 carry out signal modulation, and modulated Raman electric signal and frequency spectrograph 611 are defeated
Enter end to be connected, realizes beat frequency detection.
611 output end of frequency spectrograph is connected with feedback control module 612, by analyzing the intensity and stability of beat signal,
Required light comb light source parameters in real process are selected, 203 length of optical fiber in modulating oscillator (adjusts the repetition of seed light
Frequency), 204 voltage of piezoelectric ceramics (repetition rate of precision locking seed light), pulse-width controlled system grating is main to 408 distances
To 513 distances, that realizes multi-wavelength light comb stablizes output for amplification and Pulse Compression system grating.
The femtosecond light comb light source is linked by above-mentioned six part, utilizes optical fiber self similarity amplifying technique, excitation photon crystal
The multistage Raman gain of optical fiber exports multiband Raman light comb.Multiband femtosecond light comb is finally constructed with a fiber laser system
Light-source system.
Claims (3)
1. a kind of tunable multi-wavelength femtosecond light comb light source based on raman gain fiber, which is characterized in that seed source oscillator
The seed light of output successively amplifies by cascade preamplifier system, is entered pulse width control system modulation seed light pulse again
Energy, output seed light include the broadband femtosecond light including seed light and multiple Ramans by main amplification and compressibility output
Comb, femtosecond light comb export the height of repetition rate accurate lock between each wave band by frequency dividing and multiband repetition rate locking system
Power femtosecond light comb, and frequency dividing and multiband repetition rate locking system output beat signal enter feedback control module, instead
Feedback control module outputs a control signal to seed source oscillator, pulse width control system and main amplification and Pulse Compression system is real
Existing frequency stabilization.
2. the tunable multi-wavelength femtosecond light comb light source based on raman gain fiber according to claim 1, which is characterized in that
The seed source oscillator is saturated absorbing body mode locking annular chamber, and pump light (201) is coupled in wavelength division multiplexer (202), wave
Division multiplexer (202) output light successively passes through Yb dosed optical fiber (203), piezoelectric ceramics (204), saturated absorbing body (205), coupler
(206), fibre optic isolater (207) returns in wavelength division multiplexer (202), and coupler (206) does not connect another port of annular chamber
Export seed light；Yb dosed optical fiber (203) length in feedback control module output signal modulating oscillator, adjusts seed light with this
Repetition rate；Feedback control module output signal adjusts piezoelectric ceramics (204) voltage with the repetition of this precision locking seed light
Frequency.
3. the tunable multi-wavelength femtosecond light comb light source according to claim 1 or claim 2 based on raman gain fiber, feature exist
In the high power femtosecond light comb for being incident on frequency dividing and multiband repetition rate locking system is via reflecting mirror and condenser lens
It is collimated into directional light, reflects seed light using the first dichroscope (605) in system, the seed light reflected passes through system
In the first half wave plate (606), be incident on the first polarization splitting prism (607) and be divided, the first polarization splitting prism
(607) reflected light is connected with oscillograph (613), and the first polarization splitting prism (607) transmitted light enters the first photoelectric probe (608)
Collected, the electric signal that seed light comb signal is converted to corresponding to it after the first photoelectric probe (608) is output to frequency spectrograph
(611)；
The transmitted light of first dichroscope (605) is successively reflected by several dichroscopes, and several dichroscopes reflect
Several Raman lights pass through half wave plate and polarization splitting prism in respective optical path, polarization splitting prism reflected light respectively
It is output to oscillograph (613), it is collected that polarization splitting prism transmitted light respectively enters respective photoelectric probe, and photoelectric probe is by Raman
Light comb is converted into its corresponding electric signal, then carries out signal modulation, modulation by respective time delay module, amplifier respectively
Raman electric signal afterwards is sent into frequency spectrograph (611), realizes beat frequency detection；Frequency spectrograph (611) outputs signals to feedback control module
(612)。
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Cited By (2)
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| 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 |
| CN112987444A (en) * | 2021-02-07 | 2021-06-18 | 中国科学院上海光学精密机械研究所 | Nonlinear gain modulation optical frequency comb and production method thereof |
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