CN104834149B - Single fiber type CARS excitation source apparatus and implementation method based on the non-linear tuning of twin-stage - Google Patents
Single fiber type CARS excitation source apparatus and implementation method based on the non-linear tuning of twin-stage Download PDFInfo
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- CN104834149B CN104834149B CN201510178527.8A CN201510178527A CN104834149B CN 104834149 B CN104834149 B CN 104834149B CN 201510178527 A CN201510178527 A CN 201510178527A CN 104834149 B CN104834149 B CN 104834149B
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/35—Non-linear optics
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/65—Raman scattering
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/65—Raman scattering
- G01N2021/653—Coherent methods [CARS]
- G01N2021/655—Stimulated Raman
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Abstract
The invention discloses a kind of single fiber type CARS excitation source apparatus and method based on the non-linear tuning of twin-stage, including femtosecond fiber LASER Light Source, automatically controlled optical power attenuation device, one-level tuner, pulse stretcher, two grades of tuners, pump laser, wavelength division multiplexer, gain fibre, filter and output port.Femtosecond fiber LASER Light Source output femtosecond pulse is used as Stokes light pulse, into automatically controlled optical power attenuation device, the light pulse wavelength tuning of Power Control is realized in one-level tuner, through pulse stretcher broadening into entering after picopulse to gain fibre amplification, signal pulse and ideler frequency light pulse are produced in two grades of tuners, signal pulse is used as the pumping light pulse in CARS sources, and filter filters out ideler frequency light pulse and the remaining continuous light of pumping, output port output.Compared with prior art, the present invention uses single fiber light channel structure and automatically controlled tuning, has the advantages that compact conformation, anti-interference, reliability are high and tuned speed is fast, meets the demand of CARS fast imagings.
Description
Technical field
The present invention relates to optical nonlinearity micro-imaging technique field, more particularly to a kind of CARS micro imaging systems swash
Source arrangement.
Background technology
CARS it is micro- using coherent anti-stokes raman scattering come molecular detection.When pump light and the frequency of stokes light
When difference is equal to the vibration frequency of molecules detected, very strong anti-Stokes scattering light can be produced, it is possible thereby to examine to be measured point
Son.Because CARS micro-imaging techniques signal to noise ratio is high, with three-dimensional chromatography ability, without fluorescence labeling and confocal system, in recent years
To cause extensive concern, develop very rapid.CARS micro imaging systems need the laser of two wavelength, wherein at least one
It is tunable wave length.At present, CARS systems are generally using two titanium-doped sapphire lasers or same with feedback control
Two optical parametric oscillators of pumping source pumping need synchronization as excitaton source, pump light and stokes light, and regulation is complicated
And causing wavelength tuning speed slow using mechanical device tuning, whole system is huge, it is necessary to full-time technical staff's maintenance, serious resistance
CARS extensive use is hindered.Therefore, the high and easy to use CARS excitaton sources of compact conformation, with low cost, reliability are very
It is crucial.
The content of the invention
The problem of existing for traditional CARS devices, the present invention proposes a kind of single fiber type based on the non-linear tuning of twin-stage
CARS excitation source apparatus and method.The CARS excitaton sources integrate soliton self-frequency sh and four-wave mixing effect, and automatically controlled system is used first
System regulating optical power realizes that wavelength small range is tuned, and recycles nonlinear effect to realize dual wavelengh synchronized generation and a wide range of tune
Humorous, all optical fibre structure ensure that system compactness and high reliability.
The present invention proposes a kind of single fiber type CARS excitation source apparatus based on the non-linear tuning of twin-stage, and the device is from input
Sequentially include femtosecond fiber LASER Light Source 1, automatically controlled optical power attenuation device 2, voltage controller 3, one-level tuner 4, arteries and veins to output
Rush stretcher 5, pump laser source 6, wavelength division multiplexer 7, gain fibre 8, two grades of tuners 9, filter 10 and output port 11；
Wherein：
The femtosecond fiber LASER Light Source 1, for providing femtosecond linear polarization pulsed light, the Stokes as CARS sources
Light pulse seed source, 50~200fs of its pulse duration range, centre wavelength be 1030~1064nm, repetition rate 10MHz~
100MHz, pulse energy is more than 1nJ；
The automatically controlled optical power attenuation device 2, is made up of phase delay device and analyzer, prolongs for applying a voltage to phase
Slow device changes the phase delay between horizontal polarization and vertical polarization, the polarization state of emergent light is changed, through analyzer
Power produce change, realize optical power attenuation adjust；
The voltage controller 3, for output control voltage, controls the pad value of automatically controlled optical power attenuation device；
The one-level tuner 4, is made up of photonic crystal fiber, for realizing that the wavelength of small range is adjusted to femtosecond pulse light
It is humorous, 10~40nm of tuning range, 10~40nm of tuning wavelength scope；
The pulse stretcher 5, is made up of single mode and multimode fibre welding, for by Stokes optical pulse broadening to 30
~80ps；
The pump laser source 6, using 980nm pump lasers, for providing the continuous light of pumping to gain fibre；
The wavelength division multiplexer 7, the continuous light of pumping and one-level tuner output stokes light pulse combination is a branch of, it is defeated
Enter into gain fibre；
Gain fibre 8, using Yb dosed optical fiber, for amplifying the Stokes light pulse after one-level tuner, makes output arteries and veins
Peak power is rushed in 3~20kW；
Two grades of tuners 9, are made up of photonic crystal fiber, are acted on and adjusted using the four-wave mixing of photonic crystal fiber
It is humorous；One-level tuner 4 is exported and the high-peak power stokes light impulses injection of amplified formation its photonic crystal fiber
Afterwards, signal pulse and ideler frequency light pulse are produced by four-wave mixing effect；Signal pulse and the wavelength of ideler frequency light pulse according to
The Stokes light pulse wavelength of Lai Yu injections；Signal pulse is used as the pumping light pulse in CARS sources, Stokes light pulse
The small range tuning of wavelength will cause a wide range of tuning of signal pulse；The pumping light pulse in CARS sources and stokes light arteries and veins
The frequency difference of punching covers 400~4000cm-1The molecular vibration spectral limit of scope.
The filter 10, the pump that ideler frequency light pulse and remaining pump laser for filtering out two grades of tuners are exported
The continuous light in Pu；
Output port 11, the external fiber interface for output.
The invention also provides a kind of implementation method of the single fiber type CARS excitation source apparatus based on the non-linear tuning of twin-stage,
This method comprises the following steps：
Femtosecond fiber LASER Light Source 1 provides femtosecond linear polarization pulsed light, the Stokes light pulse kind as CARS sources
Component, 50~200fs of its pulse duration range, centre wavelength is 1030~1064nm, repetition rate 10MHz~100MHz, pulse energy
Amount is more than 1nJ；
The output control voltage of voltage controller 3, so as to control the automatically controlled luminous power being made up of phase delay device and analyzer
The pad value of attenuator 2, realizes that optical power attenuation is adjusted；
The injected optical power of one-level tuner 4 is controlled, is realized to stokes light Pulse tuning, tuning wavelength scope 10~
40nm；
Pulse stretcher 5 is by Stokes optical pulse broadening to 30~80ps；
Pump laser 6 provides the continuous light of pumping to gain fibre；
By a branch of, the input by the continuous light of pumping and one-level tuner output stokes light pulse combination of wavelength division multiplexer 7
It is amplified into gain fibre, the amplified output peak value of pulse work(of the Stokes light pulse after the tuning of one-level tuner 4
Rate is in 3~20kW；
Output optical pulse is injected into two grades of tuners 9, and flashlight is produced using the four-wave mixing effect of photonic crystal fiber
Stokes light pulse wavelength of the wavelength of pulse and ideler frequency light pulse, signal pulse and ideler frequency light pulse dependent on injection,
Signal pulse is used as the pumping light pulse in CARS sources, and the small range tuning of Stokes light pulse wavelength will cause flashlight arteries and veins
The frequency difference of a wide range of tuning of punching, Stokes light pulse and signal pulse covers 400~4000cm-1The molecular vibration of scope
Spectral limit；
Filtered out using filter 10 after the ideler frequency light of two grades of tuners and the pump light of pump laser output, through output end
Mouth 11 exports the light pulse of two wavelength.
Compared with prior art, the present invention has following technique effect：
1st, the single fiber type CARS excitation source apparatus proposed by the present invention based on the non-linear tuning of twin-stage is simple in construction, only singly
Fine light path, without beam splitting and delay adjustment part, whole system is greatly improved without mechanical moving element, reliability and stability；
2nd, twin-stage tuning structure effectively reduces the enforcement difficulty of broad tuning scope, expands the molecule of the covering in CARS sources
Vibrational wave number scope, automatically controlled tuned speed is fast and with the natural synchronism of pulse, is advantageously implemented CARS real time imageries.
Brief description of the drawings
Fig. 1 is the single fiber type CARS excitaton source system construction drawings based on the non-linear tuning of twin-stage；
Fig. 2 is signal pulse and ideler frequency light pulsed light wave personal attendant injection Stokes light pulse wavelength in two grades of tuners
Change curve；
Fig. 3 is flashlight and the spectrogram of ideler frequency light after stokes light impulses injection；
In figure, 1, femtosecond fiber LASER Light Source, 2, automatically controlled optical power attenuation device, 3, voltage controller, 4, one-level tuner,
5th, pulse stretcher, 6, pump laser source, 7, wavelength division multiplexer, 8, gain fibre, 9, two grades of tuners, 10, filter, 11,
Output port.
Embodiment
Below in conjunction with the drawings and the specific embodiments, technical scheme is described in further detail.
Embodiment 1：A kind of single fiber type CARS excitation source apparatus based on the non-linear tuning of twin-stage
As shown in figure 1, the device include femtosecond fiber LASER Light Source 1, automatically controlled optical power attenuation device 2, voltage controller 3,
One-level tuner 4, pulse stretcher 5, pump laser source 6, wavelength division multiplexer 7, gain fibre 8, two grades of tuners 9, filters
10 and output port 11.
The femtosecond linear polarization pulsed light that femtosecond fiber LASER Light Source 1 is exported enters electricity as stokes light pulse seed source
Optical power attenuation device 2 is controlled, optical power attenuation value is controlled by voltage controller 3, the light pulse after optical power attenuation is adjusted into one-level
Humorous device 4 realizes the light pulse wavelength tuning of Power Control, and then the pulsed light of output swashs through the broadening of pulse stretcher 5 with pumping
The continuous light of pumping that light source 6 is exported closes beam in wavelength division multiplexer 7 and enters gain fibre 8, and realization is amplified into two grades of tune
Humorous device 9, produces signal pulse and ideler frequency light pulse, and filter 10 filters out ideler frequency light pulse and the remaining continuous light of pumping,
The output signal light pulse of output port 11 and Stokes light pulse.
Embodiment 2：A kind of single fiber type CARS excitaton source implementation methods based on the non-linear tuning of twin-stage
Femtosecond linear polarization pulsed light, the Stokes light pulse as CARS sources are provided using femtosecond fiber LASER Light Source
Seed source, 50~200fs of its pulse duration range, centre wavelength is 1030~1064nm, repetition rate 10MHz~100MHz, pulse
Energy is more than 1nJ.Voltage controller output control voltage, controls the automatically controlled luminous power being made up of phase delay device and analyzer to decline
Subtract the pad value of device, realize that optical power attenuation is adjusted.One-level tuner is constituted by photonic crystal fiber, by controlling injection light work(
Rate, using the soliton self-frequency sh nonlinear effect of photonic crystal fiber, is realized to stokes light Pulse tuning, tuning wavelength model
Enclose 10~40nm.Pulse stretcher is made up of single mode and multimode fibre welding, by Stokes optical pulse broadening to 30~80ps.
980nm pump lasers provide the continuous light of pumping to gain fibre, are tuned the continuous light of pumping and one-level by wavelength division multiplexer
Device output stokes light pulse combination is a branch of, is input in gain fibre and is amplified, the Si Tuo after the tuning of one-level tuner
The amplified output pulse peak power of gram this light pulse is in 3~20kW.Output optical pulse is injected into by photonic crystal fiber structure
Into two grades of tuners, utilize the four-wave mixing effect of photonic crystal fiber to produce signal pulse and ideler frequency light pulse, signal
Stokes light pulse wavelength of the wavelength of light pulse and ideler frequency light pulse dependent on injection, signal pulse is used as CARS sources
Pumping light pulse, the small range tuning of Stokes light pulse wavelength will cause a wide range of tuning of signal pulse.Stoke
The frequency difference of this light pulse and signal pulse covers 400~4000cm-1The molecular vibration spectral limit of scope.Filtered out using filter
For filtering out after the ideler frequency light of two grades of tuners and the pump light of pump laser output, two wavelength are exported through output port
Light pulse.
As shown in Fig. 2 the stokes light pulse peak power 3kW of the LMA-8 photonic crystal fibers of injection NKT companies
When, the wavelength of signal pulse and ideler frequency light pulse with Stokes light pulse wavelength change.
As shown in figure 3, being the flashlight and the spectrogram of ideler frequency light that are produced after stokes light impulses injection.Flashlight arteries and veins
Pumping light pulse of the punching as CARS sources, the small range tuning of Stokes light pulse wavelength will cause the big model of signal pulse
Enclose tuning.The frequency difference of Stokes light pulse and signal pulse covers 400~4000cm-1The molecular vibration spectral limit of scope.
Filtered out using filter 10 after the ideler frequency light for filtering out two grades of tuners and the pump light of pump laser output, through output end
Mouth 11 exports the light pulse of CARS two wavelength of excitaton source.
Embodiment 3：Applicating example
The signal pulse of CARS sources output and Stokes light pulse, wherein signal pulse are used as the pump in CARS sources
Pu light pulse.Under the pumping light pulse in CARS sources and the two-beam impulse action of Stokes light pulse, excite first to be measured
The molecular vibration with pumping light pulse and stokes light pulse frequency difference resonance in thing, makes it produce resonance, then produces altogether
The pump light that the molecular vibration shaken exports CARS sources is largely converted into anti-Stokes light to realize the spy to specific molecular
Survey.Tuned by twin-stage, the 400~4000cm of pumping light pulse and Stokes light pulse covering wave number in CARS sources-1Molecule
Vibration, so that meeting the measurement and specific molecular composed in biochemistry to molecular vibration is excited into picture.
Claims (2)
1. a kind of single fiber type CARS excitation source apparatus based on the non-linear tuning of twin-stage, it is characterised in that the device is from being input to
Output sequentially includes femtosecond fiber LASER Light Source (1), automatically controlled optical power attenuation device (2), voltage controller (3), one-level tuner
(4), pulse stretcher (5), pump laser source (6), wavelength division multiplexer (7), gain fibre (8), two grades of tuners (9), optical filterings
Device (10) and output port (11)；Wherein：
The femtosecond fiber LASER Light Source (1), for providing femtosecond linear polarization pulsed light, the stokes light as CARS sources
Pulse seed source, 50~200fs of its pulse duration range, centre wavelength be 1030~1064nm, repetition rate 10MHz~100MHz,
Pulse energy is more than 1nJ；
The automatically controlled optical power attenuation device (2), is made up of phase delay device and analyzer, for applying a voltage to phase delay
Device changes the phase delay between horizontal polarization and vertical polarization, the polarization state of emergent light is changed, through analyzer
Power produces change, realizes that optical power attenuation is adjusted；
The voltage controller (3), for output control voltage, controls the pad value of automatically controlled optical power attenuation device；
The one-level tuner (4), is made up of photonic crystal fiber, for realizing that the wavelength of small range is adjusted to femtosecond pulse light
It is humorous, 10~40nm of tuning range；
The pulse stretcher (5), is made up of single mode and multimode fibre welding, for by Stokes optical pulse broadening to 30~
80ps；
The pump laser source (6), using 980nm pump lasers, for providing the continuous light of pumping to gain fibre；
The wavelength division multiplexer (7), the continuous light of pumping and one-level tuner output stokes light pulse combination is a branch of, input
Into gain fibre；
Gain fibre (8), using Yb dosed optical fiber, for amplifying the Stokes light pulse after one-level tuner, makes output pulse
Peak power is in 3~20kW；
Two grades of tuners (9), are made up of photonic crystal fiber, are acted on and tuned using the four-wave mixing of photonic crystal fiber；
One-level tuner (4) is exported and after the high-peak power stokes light impulses injection photonic crystal fiber of amplified formation,
Signal pulse and ideler frequency light pulse are produced by four-wave mixing effect；Signal pulse and the wavelength of ideler frequency light pulse are depended on
The Stokes light pulse wavelength of injection；Signal pulse is used as the pumping light pulse in CARS sources, Stokes light pulse wavelength
Small range tuning will cause a wide range of tuning of signal pulse；The pumping light pulse in CARS sources and Stokes light pulse
Frequency difference covers 400~4000cm-1The molecular vibration spectral limit of scope；
The filter (10), the pumping that ideler frequency light pulse and remaining pump laser for filtering out two grades of tuners are exported
Continuous light；
Output port (11), the external fiber interface for output.
2. a kind of realization side of the single fiber type CARS excitation source apparatus based on the non-linear tuning of twin-stage as claimed in claim 1
Method, it is characterised in that this method comprises the following steps：
Femtosecond fiber LASER Light Source (1) provides femtosecond linear polarization pulsed light, the stokes light pulse seed as CARS sources
Source, 50~200fs of its pulse duration range, centre wavelength is 1030~1064nm, repetition rate 10MHz~100MHz, pulse energy
More than 1nJ；
Voltage controller (3) output control voltage, so as to control the automatically controlled luminous power being made up of phase delay device and analyzer to decline
Subtract the pad value of device (2), realize that optical power attenuation is adjusted；
One-level tuner (4) injected optical power is controlled, is realized to stokes light Pulse tuning, tuning wavelength scope 10~
40nm；
Pulse stretcher (5) is by Stokes optical pulse broadening to 30~80ps；
Pump laser (6) provides the continuous light of pumping to gain fibre；
It is by wavelength division multiplexer (7) that the continuous light of pumping and one-level tuner output stokes light pulse combination is a branch of, it is input to
It is amplified in gain fibre, the amplified output peak value of pulse work(of the Stokes light pulse after one-level tuner (4) tuning
Rate is in 3~20kW；
Output optical pulse is injected into two grades of tuners (9), and flashlight arteries and veins is produced using the four-wave mixing effect of photonic crystal fiber
Stokes light pulse wavelength of the wavelength of punching and ideler frequency light pulse, signal pulse and ideler frequency light pulse dependent on injection, letter
Number light pulse is used as the pumping light pulse in CARS sources, and the small range tuning of Stokes light pulse wavelength will cause signal pulse
A wide range of tuning, the frequency difference of Stokes light pulse and signal pulse covers 400~4000cm-1The molecular vibration spectrum of scope
Scope；
Filtered out using filter (10) after the ideler frequency light of two grades of tuners and the pump light of pump laser output, through output port
(11) light pulse of two wavelength is exported.
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| CN106680260B (en) * | 2015-11-05 | 2018-10-16 | 中国科学院大连化学物理研究所 | A kind of portable coherent antistockes Raman spectroscopy instrument |
| CN107368284B (en) * | 2017-07-25 | 2020-05-15 | 太原理工大学 | Method and device for realizing generation of all-optical quantum random number by using four-wave mixing effect |
| CN107589613B (en) * | 2017-08-18 | 2020-05-19 | 天津大学 | Multi-soliton synchronous scanning-based multi-point output CARS excitation source device and generation method |
| CN111442851B (en) * | 2020-04-13 | 2021-01-29 | 重庆大学 | Time lens measuring system based on Raman soliton self-frequency shift |
| CN113285344B (en) * | 2021-04-02 | 2022-09-23 | 华东师范大学重庆研究院 | Wide-band tunable two-color ultrafast pulse synchronization technology |
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