CN109038204A - Stimulated Raman scattering imaging source based on photonic crystal fiber - Google Patents
Stimulated Raman scattering imaging source based on photonic crystal fiber Download PDFInfo
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- CN109038204A CN109038204A CN201810730228.4A CN201810730228A CN109038204A CN 109038204 A CN109038204 A CN 109038204A CN 201810730228 A CN201810730228 A CN 201810730228A CN 109038204 A CN109038204 A CN 109038204A
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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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- Optics & Photonics (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
The seed light of the present invention relates to a kind of stimulated Raman scattering imaging source based on photonic crystal fiber, laser oscillator output exports after pre-amplification module amplifies, and is directly entered parametric oscillation structure；Amplified pump light enters parametric oscillation structure from photo-coupler, nonlinear effect occurs through photonic crystal fiber in the parameter transform module being made of photonic crystal fiber and generates stokes light, beam splitter is passed through in the output of parameter transform module, light beam is divided into two-way, it directly exports all the way, another way is fed into repetition tuner module and time delays module, change the repetition rate for participating in the stokes light of feedback oscillation, offer again passes by photo-coupler from the stokes light of pump phototiming but different repetitions and is coupled into parametric oscillation structure, meet the demand of stimulated Raman scattering imaging source.Realize in set of device stokes light and pump phototiming but different repetitions.
Description
Technical field
The present invention relates to a kind of imaging source, in particular to a kind of stimulated Raman scattering imaging based on photonic crystal fiber
Light source.
Background technique
Coherent Raman scattering (Coherent Raman Scattering, CRS) imaging technique is due to unmarked, non-
Invasive, not damaged and chemical specificity feature is widely used in biology using chemical bond oscillations as image contrast
And medical domain.Realize that CRS imaging includes two ways, coherent anti-stokes raman scattering (Coherent Anti-
Stokes Raman Scattering, CARS) and stimulated Raman scattering (Stimulated Raman Scattering,
SRS).Wherein CARS imaging technique due to the presence of its off-resonance ambient noise make generate CARS scanning signal peak value frequency
It is migrated on domain, can not be completely corresponding with Raman signal, this will affect the accuracy of elemental analysis, reduce imaging
Sensitivity.And SRS technology is without off-resonance ambient noise, spectral information and spontaneous Raman spectrum are completely the same, therefore obtain
Image-forming information is more acurrate, and the relationship of SRS signal and the proportional example of molecular concentration, can be according to SRS signal to molecular concentration
Carry out quantitative analysis.
SRS technology needs measure relatively very weak excited Raman gain (Stimulated Raman under strong bias light
Gain, SRG) and excited Raman loss (Stimulated Raman Loss, SRL), it is therefore desirable to pump light and Stokes
One of light carries out radio-frequency modulations.SRL signal and SRG have skew-symmetry, and when modulation light occurs, detected light exists
It is enhanced in SRG, is weakened in SRL, exported and pump light co-wavelength and stokes light with the pulse envelope of repetition, then pass through
Demodulation techniques extract SRG.
Realize there are two ways to stimulated Raman scattering imaging source is often used at present: one is stimulated Raman scattering imagings
Two signals are adjusted to synchronize by the laser that source needs two central wavelength different by complicated electronic feedback circuit, then to it
Repetition modulation is added in middle light beam；Another kind is combined using solid state laser and parametric oscillation technology, to pump light and this support
The wherein a branch of of Ke Si light is modulated, and realizes two-beam synchronization but different repetitions, then carry out light path control to two-beam, realizes
Space overlap.First method system structure is complicated, and two lasers involve great expense, and largely increases cost；Second
Kind method is not only affected by environment big using solid state laser, and light beam is unstable, and threshold value needed for modulation light beam is high, also needs
Want professional's periodic maintenance.Therefore, it is necessary to propose that new scheme solves problem above.
Summary of the invention
The present invention be directed to stimulated Raman scattering imaging source there are the problem of, propose a kind of based on photonic crystal fiber
Stimulated Raman scattering imaging source provided for stimulated Raman scattering imaging source and pump light and repeat using repetition tuner module
The different stokes light of frequency, meets the occurrence condition of stimulated Raman scattering；Application Optics parametric oscillation structure is defeated simultaneously
Time and spatially synchronous pump light and stokes light out, realize the stimulated Raman scattering imaging source of narrowband.
The technical solution of the present invention is as follows: a kind of stimulated Raman scattering imaging source based on photonic crystal fiber, including swash
Optical generator, pre-amplification module, photo-coupler, main amplification module, parameter transform module, beam splitter, repetition tuner module and when
Between time delay module；Laser oscillator output seed light exported after pre-amplification module carries out raising mean power, directly into
Enter the parametric oscillation structure with active amplification module or enters back into the parameter vibration of no active amplification module by active amplification module
Swing structure；Parametric oscillation structure with active amplification module includes being closed sequentially connected photo-coupler, main amplification module, parameter
Conversion module, beam splitter, repetition tuner module and time delays module；The parametric oscillation structure of no active amplification module includes closing
Close sequentially connected photo-coupler, parameter transform module, beam splitter, repetition tuner module and time delays module；It is amplified
It pumps light and enters parametric oscillation structure from photo-coupler, through photonic crystal light in the parameter transform module being made of photonic crystal fiber
Fibre occurs nonlinear effect and generates stokes light, and beam splitter is passed through in the output of parameter transform module, and light beam is divided into two-way, and one
Road directly exports, and another way is fed into repetition tuner module and time delays module, changes the stoke for participating in feedback oscillation
The repetition rate of this light provides and again passes by photo-coupler from the stokes light of pump phototiming but different repetitions and be coupled into ginseng
Oscillating structure is measured, the demand of stimulated Raman scattering imaging source is met.
The photo-coupler uses optical fibre wavelength division multiplexer or dichroscope, by feedback signal and pump optically coupling to same ginseng
Amount oscillation is intracavitary, completes parametric oscillation feedback.
The parameter transform module being made of photonic crystal fiber occurs that pump light in photonic crystal fiber non-linear
Parameter transform, stokes light needed for generating stimulated Raman scattering also provide gain media for parametric oscillation, improve stoke
The power of this light has compressed the spectrum width of stokes light simultaneously.
The repetition tuner module selection acousto-optic modulator or electrooptic modulator, realize the Stokes for participating in parametric oscillation
Light repetition rate it is tunable, make light source output stokes light and pump the dipulse of phototiming but different repetition.
The time delays module is overlapped stokes light and pump light over time and space by adjusting delay,
Realize the amplification of Stokes optical power and the compression of its spectrum width.
The beneficial effects of the present invention are: the present invention is based on the stimulated Raman scattering imaging source of photonic crystal fiber, weights
The application of frequency tuner module realizes in set of device stokes light and pump phototiming but different repetitions, solves traditional skill
Two Laser synchronisations of art and the problem of modulation, keep apparatus structure simple, operate conveniently；Synchronous stimulated Raman scattering imaging
Source solves the cost problem for being just able to achieve different central wavelength laser outputs in conventional method using two lasers, only with a set of
The demand of light source can be realized in parametric oscillator；The structure of feedback cavity makes the stokes light of output under the effect that dispersion filters
The output of narrow-band spectrum is realized, is imaged for stimulated Raman scattering, the spectral resolution that light source is imaged is high, and testing result can
It is good by property；Optical parametric oscillator structure is applied to stimulated Raman scattering imaging source by the invention, realizes Stokes optical power
Amplification improves the noise of stokes light when output power, improves the detectivity of species analysis；Optical fiber technology
Using make the laser source relative to solid state laser have easy of integration, good beam quality, laser signal it is stable, it is easy to maintain and
The high advantage of cost performance.
Detailed description of the invention
Fig. 1 is that the present invention is based on the stimulated Raman scattering imaging light source module structural frame diagrams of photonic crystal fiber；
Fig. 2 is that the present invention is based on one structure charts of stimulated Raman scattering imaging source embodiment of photonic crystal fiber；
Fig. 3 is that the present invention is based on two structure charts of stimulated Raman scattering imaging source embodiment of photonic crystal fiber；
Fig. 4 is that the present invention is based on three structure charts of stimulated Raman scattering imaging source embodiment of photonic crystal fiber.
Specific embodiment
Stimulated Raman scattering imaging light source module structural frame diagram based on photonic crystal fiber as shown in Figure 1,
Laser oscillator realizes the output of pulse seed light by active or passive mode-locking mode, and the seed light of output is by pre-
Amplification module, mean power are improved.There are two types of connection types for the output end of pre-amplification module: it is first that one is pre-amplification modules
Photo-coupler is connected, main amplification module is connected afterwards, seed optical power is amplified again, i.e., master is placed in parametric oscillation structure；Separately
One kind be pre-amplification module first connect main amplification module, after be sequentially connected with photo-coupler, i.e., master be placed on outside parametric oscillation structure.With
The output end of the upper module is sequentially connected the parameter transform module being made of photonic crystal fiber, in the module, pump light warp
Photonic crystal fiber occurs nonlinear effect and generates stokes light.The output of parameter transform module is connected to beam splitter, by light
Beam is divided into two-way: all the way as the output end of the light source, for stimulated Raman scattering imaging or real-time detection；Another way sequentially connects
Repetition tuner module is connect, which changes the stokes light for participating in feedback oscillation by acousto-optic modulator or electrooptic modulator
Repetition rate provides the stokes light from pump phototiming but different repetitions, meets the need of stimulated Raman scattering imaging source
It asks.Repetition tuner module exports Connection Time time delay module, is delayed by adjusting, and stokes light and pump light is made to meet phase
With condition.Time delays module output end, which is connected in photo-coupler, completes parameter feedback.In the invention, parametric oscillation structure
Using not only being amplified to Stokes optical power, and its spectrum width is compressed, to realize a kind of synchronization
Narrowband stimulated Raman scattering imaging source.The output end all the way of parameter transform module is the output end of the light source.
Fig. 2 is the stimulated Raman scattering imaging source embodiment one based on photonic crystal fiber, and specific implementation process is as follows:
The oscillator of invention stimulated Raman scattering (SRS) imaging source is passively locked using semiconductor saturable absorbing mirror SESAM
Mould mode, oscillator chamber element successively includes: SESAM, wavelength division multiplexer WDM, gain media Gain, fiber bragg grating
FBG.Oscillator output end connects the pre-amplification module (WDM+Gain) for amplifying seed optical power, will be shaken by isolator ISO
It swings device and pre-amplification module separates and breaks chamber element to prevent return light；The output end of pre-amplification module connects the light being made of WDM
Coupler, the stokes light for coupling pump light and feedback；WDM is sequentially connected with by non-polarization-maintaining gain fibre Non-PM Gain
The main amplification module constituted realizes the amplification again of seed optical power, meets the demand of parameter transform and parametric oscillation；Master is put
Output end connects photonic crystal fiber PCF, since main amplification gain uses non PM fiber, puts end in master and does not enter
Polarization Controller PC is added in the position of PCF, adjusts pump polarization state, then a certain special polarization state pump light can enter in PCF, occurs
Four-wave mixing, stokes light needed for generating stimulated Raman scattering imaging；PCF output end be connected to by two point of one plectrum and partially
Light beam is divided into two parts, output end of a part as light source, another portion by the splitter module that the beam splitter PBS that shakes is constituted, PBS
Point repetition tuner module that is made of acousto-optic modulator AOM of connection, that realizes the stokes light repetition for participating in parametric oscillation can
Tuning；AOM output light enters back into delay motor Delay stage by time delay optical fiber Delay fiber, time delay optical fiber and prolongs
When motor collectively form time delays module, change time delay optical fiber length or adjust delay motor distance can be achieved stoke
The phase matched of this light and pump light；Last stokes light, which is output in WDM, completes parameter feedback.The embodiment uses all -fiber
The parametric oscillation system of structure realizes the synchronous narrow-band stimulated Raman scattering imaging source based on photonic crystal fiber.
Fig. 3 is two structure chart of stimulated Raman scattering imaging source embodiment based on photonic crystal fiber, specific implementation
Process is as follows:
The oscillator of invention SRS imaging source uses nonlinear polarization rotation (NPR) passive mode-locking mode, oscillator chamber element
Include what is be sequentially connected in a closed loop mode: WDM, Gain, PC, isolator ISO, PC, output coupler OC.Oscillator output end connection is used
In the pre-amplification module of amplification seed optical power, oscillator and pre-amplification module are separated by ISO and break chamber member to prevent return light
Part；The output end of pre-amplification module connects the photo-coupler being made of WDM, the stokes light for coupling pump light and feedback；
The main amplification module that photo-coupler output connection is made of polarization-maintaining gain fibre PM Gain, realizes putting again for seed optical power
Greatly, the demand of parameter transform and parametric oscillation is met；Main output end of putting is sequentially connected PCF, and it is mixed that four waves occur in PCF for pump light
Frequently, stokes light needed for generating stimulated Raman scattering imaging；PCF output end is connected to be made of two point of one plectrum and PBS
Splitter module, light beam is divided into two parts by PBS, and output end of a part as light source, another part connection is by electric light tune
The repetition tuner module that device EOM processed is constituted realizes the tunable of stokes light repetition；EOM output light passes through time delay optical fiber
Delay fiber enters back into delay motor Delay stage, and time delay optical fiber and delay motor collectively form time delays module,
The distance for changing the length of time delay optical fiber or the motor that is delayed realizes stokes light and pumps the phase matched of light；Last stoke
This light output completes parameter feedback into WDM.The embodiment uses the parametric oscillation system of all optical fibre structure, realizes based on light
The synchronous narrow-band stimulated Raman scattering imaging source of photonic crystal fiber.
Fig. 4 is three structure chart of stimulated Raman scattering imaging source embodiment based on photonic crystal fiber, specific implementation
Process is as follows:
The oscillator of the invention stimulated Raman scattering imaging source uses nonlinear amplified loop mirror (NALM) quilt of 8 word cavity configurations
Dynamic mode locking mode, oscillator chamber element include by output coupler OC two closed chambers of connection, and first closed chamber includes successively
Closed loop connection: WDM, bandpass filter BP, OC, ISO, Gain；Second closed chamber includes to be sequentially connected in a closed loop mode: WDM,
The output coupler OC of Gain, WDM, dispersion compensating fiber (DCF), first closed chamber of oscillator export seed light.Oscillator
Output end connects the pre-amplification module for amplifying seed optical power, separates two modules by ISO and breaks chamber member to prevent return light
Part；Seed light is coupled into the space structure being made of polarization-maintaining gain fibre by condenser lens by the output end of pre-amplification module
Main amplification module places the dichroscope (DM) that saturating 980 nm high of a height instead pumps light, the company of 980 nm after main amplification module
Continuous light realizes the amplification again of seed optical power, the demand of parameter transform and parametric oscillation is met, wherein leading from reversed input
It puts and puts two intermodules in advance and be put into a space isolator, break pre- put and oscillator to prevent the main return light put；Pass through later
Reflecting mirror and condenser lens will pump optical coupling into PCF, four-wave mixing occur, Si Tuo needed for generating stimulated Raman scattering imaging
Ke Si light；The DM that a height pumps the high anti-Stokes light of light thoroughly is placed between the reflecting mirror and condenser lens, is used for coupling pump
The stokes light of light and feedback, PCF output end are connected to the beam splitter being made of two point of one plectrum and polarization beam apparatus (PBS)
Light beam is divided into two parts, output end of a part as light source by module, PBS, and another part is connected by space electrooptic modulator
(EOM) the repetition tuner module constituted realizes the tunable of stokes light repetition；EOM output light is coupled by condenser lens
To time delay optical fiber, delay motor is entered back into, time delay optical fiber and delay motor collectively form time delays module, change time delay optical fiber
Length, be delayed motor distance and DM angle, make stokes light and pump light it is synchronous over time and space, thus
It realizes stokes light and pumps the phase matched of light；Last stokes light is reflected into DM by high reflective mirror, is finally completed parameter
Feedback.The embodiment uses the parametric oscillation system of space structure, realizes the synchronous narrow-band based on photonic crystal fiber and is excited
Raman scattering imaging source.
Claims (5)
1. a kind of stimulated Raman scattering imaging source based on photonic crystal fiber, which is characterized in that including laser oscillator, in advance
Amplification module, photo-coupler, main amplification module, parameter transform module, beam splitter, repetition tuner module and time delays module；
The seed light of laser oscillator output exports after pre-amplification module carries out raising mean power, is directly entered band and actively amplifies
The parametric oscillation structure of module or the parametric oscillation structure that no active amplification module is entered back by active amplification module；Band is actively
The parametric oscillation structure of amplification module includes being closed sequentially connected photo-coupler, main amplification module, parameter transform module, beam splitting
Device, repetition tuner module and time delays module；The parametric oscillation structure of no active amplification module includes that closure is sequentially connected
Photo-coupler, parameter transform module, beam splitter, repetition tuner module and time delays module；Amplified pump light is from optical coupling
Device enters parametric oscillation structure, occurs in the parameter transform module being made of photonic crystal fiber through photonic crystal fiber non-linear
Effect generates stokes light, and the output of parameter transform module passes through beam splitter, light beam is divided into two-way, directly exports all the way,
Another way is fed into repetition tuner module and time delays module, changes the repetition frequency for participating in the stokes light of feedback oscillation
Rate provides and again passes by photo-coupler from the stokes light of pump phototiming but different repetitions and be coupled into parametric oscillation structure,
Meet the demand of stimulated Raman scattering imaging source.
2. the stimulated Raman scattering imaging source based on photonic crystal fiber according to claim 1, which is characterized in that described
Photo-coupler uses optical fibre wavelength division multiplexer or dichroscope, and feedback signal and pump is intracavitary optically coupling to same parametric oscillation,
Complete parametric oscillation feedback.
3. the stimulated Raman scattering imaging source according to claim 1 or claim 2 based on photonic crystal fiber, which is characterized in that
The parameter transform module being made of photonic crystal fiber makes pump light that non-linear parameter occur in photonic crystal fiber and turns
It changes, stokes light needed for generating stimulated Raman scattering also provides gain media for parametric oscillation, improves stokes light
Power has compressed the spectrum width of stokes light simultaneously.
4. the stimulated Raman scattering imaging source based on photonic crystal fiber according to claim 3, which is characterized in that described
Repetition tuner module selects acousto-optic modulator or electrooptic modulator, realizes the stokes light repetition rate for participating in parametric oscillation
It is tunable, make light source output stokes light and pumps the dipulse of phototiming but different repetitions.
5. the stimulated Raman scattering imaging source based on photonic crystal fiber according to claim 3, which is characterized in that described
Time delays module is overlapped stokes light and pump light over time and space by adjusting delay, realizes Stokes
The amplification of optical power and the compression of its spectrum width.
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