CN108711732A - The low repetition parametric oscillator of all -fiber for stimulated Raman scattering - Google Patents
The low repetition parametric oscillator of all -fiber for stimulated Raman scattering Download PDFInfo
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- H—ELECTRICITY
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- 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
- H01S3/106—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity
- H01S3/108—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity using non-linear optical devices, e.g. exhibiting Brillouin or Raman scattering
- H01S3/1083—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity using non-linear optical devices, e.g. exhibiting Brillouin or Raman scattering using parametric generation
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- 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
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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
- H01S3/06783—Amplifying coupler
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- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
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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
- H01S3/09—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
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- H—ELECTRICITY
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- 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
- H01S3/106—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity
- H01S3/108—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity using non-linear optical devices, e.g. exhibiting Brillouin or Raman scattering
- H01S3/1086—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity using non-linear optical devices, e.g. exhibiting Brillouin or Raman scattering using scattering effects, e.g. Raman or Brillouin effect
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Abstract
The present invention relates to a kind of low repetition parametric oscillators of all -fiber for stimulated Raman scattering, the pump light of pumping source output enters optical parametric osoillator through isolator and the first photo-coupler, the multiplex of first and second photo-couplers enters gain fibre and parameter transform medium, gain fibre amplifies the pumping light power for entering optical parametric osoillator from the first photo-coupler, gain fibre output light enters back into the parameter transform medium directly fused with gain fibre, four-wave mixing effect occurs in parameter transform medium, a parameter transform medium output light part directly exports, another part returns to the first photo-coupler as feedback light, form an optical parametric osoillator.Photo-coupler is placed in before gain fibre, keep gain fibre and parameter transform medium directly fused, it avoids under low repetition high-peak power pump light, photo-coupler tail optical fiber generates harmful nonlinear effect, improve parameter transform efficiency, reduce pectrum noise, and then realizes the parametric oscillator of the low repetition of all -fiber.
Description
Technical field
The present invention relates to a kind of laser technologies, the more particularly to a kind of low repetition parameter of all -fiber for stimulated Raman scattering
Oscillator.
Background technology
Light microscope is the important Visual retrieval tool of life science, greatly extends people for life
The understanding of science.The fluorescence microscopy of dye marker is used to we provide a kind of more direct detection mode, but glimmering
Signal may cause the change of biological tissue or cell own physiological characteristic, or even can kill observing samples cell, therefore
Markless detection technology becomes a developing direction of life science detection.Coherent anti-stokes raman scattering（CARS）Imaging
The bio-imaging that develops into of technology brings new solution, this scheme can be without label, according to substance
The vibration of molecule or rotational energy level obtain Anti-Stokes signal, realize the unmarked micro-imaging of biology.
Traditional CARS imaging systems are built using titanium sapphire laser device, and system bulky complex is expensive, needs
Professional technician's periodic maintenance and adjustment, it is harsh that this so that CARS technologies are confined to constant temperature, constant humidity and the conditions such as ultra-clean
In laboratory.With the development of Fiber laser technology, semiconductor technology and photonic crystal fiber manufacturing technology, the orphan of optical fiber is utilized
The nonlinear effects such as sub- self-frequency shift, Self-phase modulation and four-wave mixing generate the CARS imagings of two beam time synchronizations, space coincidence
The method of light source becomes research hotspot in recent years.
With the continuous development of gain fibre and nonlinear optical fiber fusion techniques, all -fiber CARS of single-pass can be achieved at present
Imaging source, but its spectrum width is too wide so that CARS imaging spectral resolution ratio is relatively low, limits the development of CARS imagings.In order to
The method that this disadvantage researcher proposes Fiber-optic parameter oscillator is overcome to obtain narrow spectrum width using dispersion filter effect
Light source, to improve the spectral resolution of CARS imagings.Some researches show that：It is dense for biological cell, especially sheath marrow etc.
Cell, the injury that the CARS imaging sources of low repetition introduce is smaller.But it is conventionally used to the low repetition of all -fiber of CARS imagings
Parametric oscillator be after photo-coupler is placed in gain fibre, the pump light after this method causes power to be amplified passes through
The nonlinear effects such as Raman are generated when photo-coupler tail optical fiber so that pumping spectrum broadens, since a part of pump light takes part in drawing
Graceful effect, therefore it is equivalent to the pump light reduction for participating in four-wave mixing effect, affect the transfer efficiency of four-wave mixing, Jin Erying
The effect of CARS imagings is rung.
Invention content
The present invention be directed to the scatterings of traditional coherent anti-Stokes Raman（CARS）Imaging source there are the problem of, it is proposed that
A kind of low repetition parametric oscillator of all -fiber for stimulated Raman scattering, changes in conventional method photo-coupler being placed in increasing
Light path layout between beneficial optical fiber and parameter transform medium before photo-coupler is placed in gain fibre, makes gain fibre and ginseng
Measuring conversion medium can be directly fused, avoids in the case where low repetition high-peak power pumps light action, and photo-coupler tail optical fiber generates
Harmful nonlinear effect improves parameter transform efficiency, reduces pectrum noise, and then realize the parameter of the low repetition of all -fiber
Oscillator, the light source obtained meet the demand of the CARS signals for detecting the dense cell such as sheath marrow.
The technical scheme is that：A kind of low repetition parametric oscillator of all -fiber for stimulated Raman scattering, including
Pumping source, isolator and by the first photo-coupler, the second photo-coupler, semiconductor laser, gain fibre, parameter transform
The optical parametric osoillator of medium, output coupler, fixed delay line and adjustable delay line composition；Pumping source output pump light pass through every
Entering optical parametric osoillator from device and the first photo-coupler, semiconductor laser connects an input terminal of the second photo-coupler, and first
Photo-coupler connects another input terminal of the second photo-coupler, and the multiplex of the first photo-coupler and the second photo-coupler enters gain
Optical fiber and parameter transform medium, semiconductor laser are the pumping sources of gain fibre, make gain fibre population inversion, in sharp
State is sent out, gain fibre amplifies the pumping light power for entering optical parametric osoillator from the first photo-coupler, and gain fibre output light is again
Into the parameter transform medium directly fused with gain fibre, in parameter transform medium four-wave mixing effect occurs for pump light,
The ideler frequency light of the short signal light of a beam ratio pump wavelength and beam ratio pump wavelength length is generated, output coupler is by parameter
A part of light directly exports in conversion medium output light, another part output light as feedback light pass sequentially through fixed delay line and
Adjustable optical delay line returns to the first photo-coupler, forms an optical parametric osoillator.
The wavelength division multiplexer of the first photo-coupler selection optical fiber structure, the laser that pumping source is generated and feedback optocoupler
It closes and enters optical parametric osoillator.
The wavelength division multiplexer or bundling device of the second photo-coupler selection optical fiber structure, semiconductor laser is generated
Semiconductor laser be coupled into gain fibre.
It is described using the truncation of parameter transform end of medium as output coupler, a part of light is transmitted from truncation end, one
Divide from truncation end reflection Hui Yuanlu；Reflected light is amplified at gain fibre, then through the second photo-coupler, the first optocoupler
Clutch, adjustable optical delay line and fixed delay line end, the light to fixed delay line end are reflected back toward optical parametric osoillator again.
The fixed delay line and fiber grating welding, realize 95% light reflection.
Fixed delay line in the feedback light path uses single mode optical fiber or polarization maintaining optical fibre, and length is according to specific pump light weight
Complex frequency calculating acquires, and is overlapped when making feedback light with pump light to the first photo-coupler.
The beneficial effects of the present invention are：The present invention is used for the low repetition parametric oscillator of all -fiber of stimulated Raman scattering,
All devices all use optical fibre device, and all devices are got up by fused fiber splice, avoid space optical coupling, are conducive to collection
At；Using the pumping source of low repetition, single pulse energy is improved, to reduce the threshold value for generating parameter transform.In addition, low repetition
Light source it is relatively low to the damage of biological cell；Photo-coupler is placed in before gain fibre, makes gain fibre and parameter transform medium
Can be directly fused, it avoids under low repetition high-peak power pump light, photo-coupler tail optical fiber generates harmful non-linear effect
It answers, improves parameter transform efficiency, reduce pectrum noise；Gain fibre has amplification to pumping light power so that higher work(
The pump light of rate enters parameter transform medium and participates in four-wave mixing process, to improve parameter transform efficiency；The parameter of structure
Conversion chamber can not only realize signal light or the resonance of ideler frequency light, and pump can also be realized under conditions of accurately controlling dispersion and delay
Pu light optical parametric osoillator resonance, to improve output power.
Description of the drawings
Fig. 1 is the low repetition parametric oscillator schematic diagram of all -fiber that the present invention is used for stimulated Raman scattering；
Fig. 2 is the present invention and spectrogram comparison diagram of the conventional method before and after parameter transform medium；
Fig. 3 is low one structural schematic diagram of repetition parametric oscillator embodiment of all -fiber that the present invention is used for stimulated Raman scattering；
Fig. 4 is low two structural schematic diagram of repetition parametric oscillator embodiment of all -fiber that the present invention is used for stimulated Raman scattering；
Fig. 5 is low three structural schematic diagram of repetition parametric oscillator embodiment of all -fiber that the present invention is used for stimulated Raman scattering；
Fig. 6 is the low repetition parametric oscillator example IV structural schematic diagram of all -fiber that the present invention is used for stimulated Raman scattering.
Specific implementation mode
A kind of low repetition parametric oscillator schematic diagram of all -fiber for stimulated Raman scattering as shown in Figure 1, including pumping
Source 1, isolator 2 and by photo-coupler 3, photo-coupler 4, semiconductor laser 5, gain fibre 6, parameter transform medium 7,
The optical parametric osoillator of output coupler 8 and fixed delay line 9 and adjustable delay line 10 composition.1 output end of pumping source and isolator 2
Input terminal is connected, and 2 output end of isolator is ined succession one of 3 input terminal of photo-coupler, and photo-coupler 3 is then defeated with photo-coupler 4
Enter one of end to be connected, another input terminal of photo-coupler 4 is ined succession semiconductor laser 5, the output end of photo-coupler 4 and gain
Optical fiber 6 is connected, and gain fibre 6 is connected with parameter transform medium 7 again, and parameter transform medium 7 is ined succession output coupler 8, defeated
Going out coupler 8, there are two output ends, its one end is connected as CARS imaging source output ends, the other end with fixed delay line 9
Connect, fixed delay line 9 is connected with adjustable delay line 10 again, adjustable delay line 10 again with another input terminal phase of photo-coupler 3
Connection forms feedback.The pump light exported by pumping source 1 multiplex end through photo-coupler 3 and photo-coupler 4 again through isolator 2
Into gain fibre 6 and parameter transform medium 7.Semiconductor laser 5 is the pumping source of gain fibre 6, makes 6 particle of gain fibre
Number reversion, is in excitation state.Gain fibre 6 amplifies the pumping light power for entering optical parametric osoillator from photo-coupler 3, due to increasing
It directly avoids pump light with 7 welding of parameter transform medium after beneficial optical fiber 6 and nonlinear effect occurs in photo-coupler tail optical fiber,
So that all pump lights are only involved in four-wave mixing effect, to reduce the threshold value for generating parameter transform.Pump light is in parameter transform
Four-wave mixing effect occurs in medium 7, generates the short signal light of a beam ratio pump wavelength, the spare time of beam ratio pump wavelength length
Parameter amplification also occurs with the signal light of feedback in parameter transform medium 7 for frequency light, pump light, to obtain needed for CARS imagings
Light source.For 8 one end of output coupler by part light output, other end fixed delay line 9 of ining succession feeds back part light, and feedback light is through can
Delay line 10 is adjusted to return to optical parametric osoillator through photo-coupler 3 again.Fig. 2 is a of the present invention and tradition b before and after parameter transform medium
Spectrogram compares, and a (1) and b (1) is the spectrogram before parameter transform medium 7 in Fig. 2, and a (2) and b (2) is parameter transform in Fig. 2
Spectrogram after medium 7.It can be seen that photo-coupler 3 is placed in gain fibre 6 and parameter by tradition from b in Fig. 2 (1) and b (2)
Method between conversion medium 7, since the nonlinear effect of 3 tail optical fiber of photo-coupler produces Raman spectrum, turn by parameter
It changes after medium 7 and produces Raman spectrumCorresponding anti-Stokes light, this belongs to harmful nonlinear effect.This
In invention such as Fig. 2 shown in a (1) and a (2), because before photo-coupler 3 is placed in gain fibre 6, make gain fibre 6 and parameter
Conversion medium 7 can be directly fused, avoids under low repetition high-peak power pump light, and what 3 tail optical fiber of photo-coupler generated has
Raman spectrum caused by evil nonlinear effect, parameter transform efficiency is improved, pectrum noise is reduced, the light source obtained
Meet the demand of the CARS for detecting the dense cell such as sheath marrow.
The pumping source 1 is pulse laser.Isolator 2 be unidirectionally by optical fiber structure optoisolator.Photo-coupler 3
The wavelength division multiplexer that optical fiber structure may be selected, optical parametric osoillator is optically coupled by laser and feedback that pumping source 1 generates.Optocoupler
The wavelength division multiplexer or bundling device of optical fiber structure may be selected in clutch 4, and the semiconductor laser that semiconductor laser 5 is generated couples
Into gain fibre 6.Semiconductor laser 5 is the pumping source of gain fibre 6, makes 6 population inversion of gain fibre, in excitation
State.Gain fibre 6 is the optical fiber that can amplify pumping light power, such as double clad gain fibre or single mode gain fibre.Parameter turns
It changes medium 7 and photonic crystal fiber can be selected, four-wave mixing effect occurs under the action of pump light, generate a beam ratio pump light wave
The signal light of length, the ideler frequency light of beam ratio pump wavelength length, and feedback signal light is subjected to parameter amplification.Output coupling
8 optional fiber coupler of device, also can be directly using the 7 end truncation of parameter transform medium as output coupler.In feedback light path
Single mode optical fiber or polarization maintaining optical fibre can be used in fixed delay line 9, and length is acquired according to the calculating of specific pump light repetition rate, it is therefore an objective to
Feedback light is set to be overlapped to when photo-coupler 3 with pump light.Adjustable delay line 10 uses optical time delay unit, or delay motor.
One structural schematic diagram of embodiment as shown in Figure 3, gain fibre are double clad gain fibre, and parameter transform medium is big
The fine low repetition parametric oscillator of the annular all-optical of core diameter photonic crystal fiber.
This device includes the pump laser as pumping source, isolator, and by wavelength division multiplexer, two for pumping
The semiconductor laser of gain fibre, double clad gain fibre, big core diameter photonic crystal fiber, output coupler, is consolidated bundling device
Surely the optical parametric osoillator of delay single mode optical fiber and adjustable light delay composition.Pump laser output end and isolator input terminal phase
Connection, isolator output end are ined succession one of wavelength division multiplexer input terminal, wavelength division multiplexer then with one of bundling device input terminal phase
Connection, another two input terminal of bundling device are ined succession semiconductor laser 1 and semiconductor laser 2, the output end of bundling device and double-contracting
Layer gain fibre is connected, and double clad gain fibre is connected with big core diameter photonic crystal fiber again, big core diameter photonic crystal light
Fibre is ined succession output coupler, and there are two output ends for output coupler, its one end is as CARS imaging source output ends, the other end
With delay single mode optical fiber be connected, delay single mode optical fiber be connected again with adjustable light delay, adjustable light delay again with wavelength-division
Another input terminal of multiplexer is connected, and forms feedback.
In the present embodiment as the pump laser output wavelength of pumping source be 1030 nm, pulse width be 34 ps, weight
Complex frequency is the pump light of 1 MHz, and pump light enters optical parametric osoillator through isolator and wavelength division multiplexer.Semiconductor laser 1
With semiconductor laser 2 for pumping double clad gain fibre, makes its population inversion, be in excitation state.From pump laser
The power after double clad gain fibre of pump light out is amplified, and the pump light after being amplified is through excessive core diameter photonic crystal
Four-wave mixing effect occurs when optical fiber, generates the ideler frequency light near the signal light and 1500 nm near 780 nm.Output coupler
By part light output, another part is fed back by constant time lag single mode optical fiber, adjustable light delay and wavelength division multiplexer, forms one
A optical parametric osoillator.Delay single-mode optical fiber length passes through following formula by the repetition rate of pumping source：
It acquires,cFor the light velocity,fFor pump light repetition rate,nFor the single mode optical fiber refractive index that is delayed.Delay is calculated in the present embodiment
Single-mode optical fiber length is 200 meters, be in order to allow feedback signal light with pump light to wavelength division multiplexer when overlap, and and pump light
Parameter amplification occurs in big core diameter photonic crystal fiber, to improve parameter transform efficiency.The present embodiment can get conversion effect
The high and low repetition of rate, pectrum noise are small, such as a in Fig. 2（2）Shown in CARS imaging sources.
Two structural schematic diagram of embodiment as shown in Figure 4, gain fibre are single mode gain fibre, and parameter transform medium is photon
The low repetition parametric oscillator of standing wave all -fiber of crystal optical fibre.
This device includes the pump laser as pumping source, isolator, and by wavelength division multiplexer 1, one for pumping
The semiconductor laser of Pu gain fibre, wavelength division multiplexer 2, single mode gain fibre, photonic crystal fiber, constant time lag single-mode optics
The optical parametric osoillator of fine and adjustable light delay composition.Pump laser output end is connected with isolator input terminal, isolator
Output end is ined succession one of 1 input terminal of wavelength division multiplexer, and wavelength division multiplexer 1 is then connected with one of 2 input terminal of wavelength division multiplexer,
Another input terminal of wavelength division multiplexer 2 is ined succession semiconductor laser, and the output end of wavelength division multiplexer 2 is connected with single mode gain fibre
It connects, single mode gain fibre is connected with photonic crystal fiber again, and the truncation of photonic crystal fiber end is as output coupler, wavelength-division
Another input terminal of multiplexer 1 is connected with adjustable light delay, and adjustable light delay is connected with delay single mode optical fiber again, prolongs
When the truncation of single mode optical fiber end, it can be achieved that 4% light reflection.
In the present embodiment as the pump laser output wavelength of pumping source be 1030 nm, pulse width be 34 ps, weight
Complex frequency is the pump light of 1 MHz, and pump light enters optical parametric osoillator through isolator and wavelength division multiplexer 1.Semiconductor laser
For pumping mono-mode gain fibre, make its population inversion, is in excitation state.The pump light come out from pump laser is by single
Power is amplified after mould gain fibre, and when passing through photonic crystal fiber four-wave mixing effect occurs for the pump light after being amplified, and is produced
The ideler frequency light near signal light and 1500 nm near raw 780 nm.Photonic crystal output end and delay single mode end truncation, pump
There are 96% light transmission output and 4% light reflection Hui Yuanlu, reflected light to exist when Pu optical transport is to photonic crystal fiber end
It can be amplified at single mode gain fibre, then delay list is transferred to through wavelength division multiplexer 1, adjustable light delay and delay single mode optical fiber
Mode fiber end, wherein thering is 4% light to be reflected, to form the low repetition parametric oscillator of a standing wave all -fiber.The present embodiment
Using the computational methods of embodiment one be calculated delay single-mode optical fiber length be 100 meters, be in order to allow feedback signal light with
It is overlapped when pump light is to wavelength division multiplexer, and parameter amplification occurs in photonic crystal fiber with pump light, to improve parameter
Transfer efficiency.The high and low repetition of the available transfer efficiency of the present embodiment, pectrum noise are small, such as a in Fig. 2（2）Shown in CARS
Imaging source.
Three structural schematic diagram of embodiment as shown in Figure 5, gain fibre are single mode gain fibre, and parameter transform medium is photon
The low repetition parametric oscillator of standing wave all -fiber of crystal optical fibre.
This device includes the pump laser as pumping source, isolator, and by wavelength division multiplexer 1, one for pumping
The semiconductor laser of Pu gain fibre, wavelength division multiplexer 2, single mode gain fibre, photonic crystal fiber, constant time lag single-mode optics
The optical parametric osoillator of fine, adjustable light delay and fiber grating composition.Pump laser output end is connected with isolator input terminal
Connect, isolator output end is ined succession one of 1 input terminal of wavelength division multiplexer, wavelength division multiplexer 1 then with 2 input terminal of wavelength division multiplexer it
One is connected, and another input terminal of wavelength division multiplexer 2 is ined succession semiconductor laser, and output end and the single mode of wavelength division multiplexer 2 increase
Beneficial optical fiber is connected, and single mode gain fibre is connected with photonic crystal fiber again, and the truncation of photonic crystal fiber end is as output
Another input terminal of coupler, wavelength division multiplexer 1 is connected with adjustable light delay, adjustable light delay again with delay single-mode optics
Fibre is connected, and delay single mode optical fiber is with fiber grating welding, it can be achieved that 95% light reflection.
In the present embodiment as the pump laser output wavelength of pumping source be 1030 nm, pulse width be 34 ps, weight
Complex frequency is the pump light of 1 MHz, and pump light enters optical parametric osoillator through isolator and wavelength division multiplexer 1.Semiconductor laser
For pumping mono-mode gain fibre, make its population inversion, is in excitation state.The pump light come out from pump laser is by single
Power is amplified after mould gain fibre, and when passing through photonic crystal fiber four-wave mixing effect occurs for the pump light after being amplified, and is produced
The ideler frequency light near signal light and 1500 nm near raw 780 nm.Photonic crystal fiber output end truncation, pump light are transferred to
There are 96% light transmission output and 4% light reflection Hui Yuanlu when photonic crystal fiber end, reflected light is in single mode gain light
Fine place can be amplified, then be transferred to fiber grating through wavelength division multiplexer 1, adjustable light delay and delay single mode optical fiber, wherein having
95% light is reflected, to form the low repetition parametric oscillator of a standing wave all -fiber.The present embodiment utilizes the meter of embodiment one
It is 100 meters that delay single-mode optical fiber length, which is calculated, in calculation method, is to allow signal light and the pump light of feedback to wavelength-division multiplex
It is overlapped when device 1, and parameter amplification occurs in photonic crystal fiber with pump light, to improve parameter transform efficiency.This implementation
The high and low repetition of the available transfer efficiency of example, pectrum noise are small, such as a in Fig. 2（2）Shown in CARS imaging sources.
Example IV structural schematic diagram as shown in Figure 6, gain fibre are double clad gain fibre, and parameter transform medium is big
The standing wave parametric oscillator of core diameter photonic crystal fiber.
This device includes the pump laser as pumping source, isolator, and by wavelength division multiplexer, two for pumping
Semiconductor laser, bundling device, double clad gain fibre, big core diameter photonic crystal fiber, the constant time lag single mode of gain fibre
The optical parametric osoillator of optical fiber, adjustable light delay and fiber grating composition.Pump laser output end and isolator input terminal phase
Connection, isolator output end are ined succession one of wavelength division multiplexer input terminal, wavelength division multiplexer then with one of bundling device input terminal phase
Connection, another two input terminal of bundling device are ined succession semiconductor laser 1 and semiconductor laser 2, the output end of bundling device and double-contracting
Layer gain fibre is connected, and double clad gain fibre is connected with big core diameter photonic crystal fiber again, big core diameter photonic crystal light
Fine end truncation is connected as output coupler, another input terminal of wavelength division multiplexer with adjustable light delay, and tunable optical is prolonged
When device be connected again with delay single mode optical fiber, delay single mode optical fiber and fiber grating welding, it can be achieved that 95% light reflection.
In the present embodiment as the pump laser output wavelength of pumping source be 1030 nm, pulse width be 34 ps, weight
Complex frequency is the pump light of 1 MHz, and pump light enters optical parametric osoillator through isolator and wavelength division multiplexer.Semiconductor laser 1
With semiconductor laser 2 for pumping double clad gain fibre, makes its population inversion, be in excitation state.From pump laser
The power after double clad gain fibre of pump light out is amplified, and the pump light after being amplified is through excessive core diameter photonic crystal
Four-wave mixing effect occurs when optical fiber, generates the ideler frequency light near the signal light and 1500 nm near 780 nm.Big core diameter photon
Crystal optical fibre output end truncation, pump light have 96% light transmission output and 4% when being transferred to big core diameter photonic crystal fiber end
Light reflection Hui Yuanlu, reflected light can be amplified at double clad gain fibre, then be delayed through wavelength division multiplexer, tunable optical
Device and delay single mode optical fiber are transferred to fiber grating, wherein there is 95% light to be reflected, it is low heavy to form a standing wave all -fiber
Frequency parametric oscillator.It is 100 meters that delay single-mode optical fiber length, which is calculated, using the computational methods of embodiment one in the present embodiment, is
In order to allow feedback signal light with pump light to wavelength division multiplexer when overlap, and join in photonic crystal fiber with pump light
Amount amplification, to improve parameter transform efficiency.The high and low repetition of the available transfer efficiency of the present embodiment, pectrum noise are small, such as Fig. 2
In a（2）Shown in CARS imaging sources.
Claims (6)
1. a kind of low repetition parametric oscillator of all -fiber for stimulated Raman scattering, which is characterized in that including pumping source, isolation
Device and by the first photo-coupler, the second photo-coupler, semiconductor laser, gain fibre, parameter transform medium, output coupling
The optical parametric osoillator of clutch, fixed delay line and adjustable delay line composition；The pump light of pumping source output is through isolator and first
Photo-coupler enters optical parametric osoillator, and semiconductor laser connects an input terminal of the second photo-coupler, and the first photo-coupler connects
The multiplex of another input terminal of second photo-coupler, the first photo-coupler and the second photo-coupler enters gain fibre and parameter
Conversion medium, semiconductor laser are the pumping sources of gain fibre, make gain fibre population inversion, are in excitation state, gain
Optical fiber amplifies the pumping light power for entering optical parametric osoillator from the first photo-coupler, and gain fibre output light enters back into and gain
Four-wave mixing effect occurs in parameter transform medium for the directly fused parameter transform medium of optical fiber, pump light, generates a beam ratio
The ideler frequency light of the short signal light of pump wavelength and beam ratio pump wavelength length, output coupler are defeated by parameter transform medium
A part of light directly exports in light extraction, and another part output light passes sequentially through fixed delay line and tunable optical delay as feedback light
Line returns to the first photo-coupler, forms an optical parametric osoillator.
2. being used for the low repetition parametric oscillator of all -fiber of stimulated Raman scattering according to claim 1, which is characterized in that institute
Laser and feedback that pumping source generates are optically coupled into parameter by the wavelength division multiplexer for stating the first photo-coupler selection optical fiber structure
Vibrate chamber.
3. being used for the low repetition parametric oscillator of all -fiber of stimulated Raman scattering according to claim 1, which is characterized in that institute
The wavelength division multiplexer or bundling device for stating the second photo-coupler selection optical fiber structure, the semiconductor that semiconductor laser generates is swashed
It is optically coupled into gain fibre.
4. according to the low repetition parametric oscillator of all -fiber for being used for stimulated Raman scattering described in any one of claims 1 to 3,
It is characterized in that, described using the truncation of parameter transform end of medium as output coupler, a part of light is transmitted from truncation end, one
Partly from truncation end reflection Hui Yuanlu；Reflected light is amplified at gain fibre, then through the second photo-coupler, the first light
Coupler, adjustable optical delay line and fixed delay line end, the light to fixed delay line end are reflected back toward parametric oscillation again
Chamber.
5. being used for the low repetition parametric oscillator of all -fiber of stimulated Raman scattering according to claim 4, which is characterized in that institute
Fixed delay line and fiber grating welding are stated, realizes 95% light reflection.
6. being used for the low repetition parametric oscillator of all -fiber of stimulated Raman scattering according to claim 4, which is characterized in that institute
The fixed delay line stated in feedback light path uses single mode optical fiber or polarization maintaining optical fibre, length to be calculated according to specific pump light repetition rate
It acquires, is overlapped when making feedback light with pump light to the first photo-coupler.
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