CN104834149A - Single-fiber-type CARS excitation source device and realization method based on two-stage non-linear tuning - Google Patents
Single-fiber-type CARS excitation source device and realization method based on two-stage non-linear tuning Download PDFInfo
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- CN104834149A CN104834149A CN201510178527.8A CN201510178527A CN104834149A CN 104834149 A CN104834149 A CN 104834149A CN 201510178527 A CN201510178527 A CN 201510178527A CN 104834149 A CN104834149 A CN 104834149A
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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
Abstract
The invention discloses a single-fiber-type CARS excitation source device and realization method based on two-stage non-linear tuning. The device comprises a femtosecond fiber laser light source, an electric control light power attenuator, a first-stage tuner, a pulse broadening device, a second-stage tuner, a pump laser, a wavelength division multiplexer, a gain fiber, an optical filter and an output port. The femtosecond fiber laser light source outputs femtosecond pulses serving as Stokes optical pulses which enter the electric control light power attenuator; power control optical pulse wavelength tuning is realized in the first-stage tuner; the pulses are broadened to be femtosecond pulses through the pulse broadening device, and the femtosecond pulses then enter the gain fiber for amplification; signal optical pulses and idler frequency optical pulses are generated in the second-stage tuner, wherein the signal optical pulses serve as pump optical pulses of a CARS source; the optical filter filters the idler frequency optical pulses and the residual pump continuous light; and the rest optical pulses are output from the output port. Compared with the prior art, the device adopts a single-fiber light path structure and electric control tuning, and has the advantages of compact structure, anti-interference, high reliability and fast tuning speed; and CARS rapid imaging requirement is met.
Description
Technical field
The present invention relates to optical nonlinearity micro-imaging technique field, particularly a kind of excitation source apparatus of CARS micro imaging system.
Background technology
The micro-coherent anti-stokes raman scattering that utilizes of CARS carrys out molecular detection.When the frequency difference of pump light and stokes light equals the vibration frequency of molecules detected, very strong anti Stokes scattering light can be produced, can testing molecule be checked thus.Because CARS micro-imaging technique signal to noise ratio (S/N ratio) is high, there is three-dimensional chromatography ability, without the need to fluorescence labeling and confocal system, cause extensive concern in recent years, develop very rapid.CARS micro imaging system needs the laser of two wavelength, wherein has at least one to be tunable wave length.At present, two optical parametric oscillators of titanium-doped sapphire laser or same pumping source pumping that CARS system adopts two to have FEEDBACK CONTROL are usually as excitaton source, pump light and stokes light need synchronous, regulate complicated and adopt the tuning wavelength tuning speed that causes of mechanical hook-up slow, whole system is huge, need full-time technician to safeguard, seriously hinder the widespread use of CARS.Therefore, compact conformation, the CARS excitaton source that with low cost, reliability is high and easy to use are very crucial.
Summary of the invention
For traditional C ARS device Problems existing, the present invention proposes a kind of based on the non-linear tuning single fiber type CARS excitation source apparatus of twin-stage and method.The comprehensive soliton self-frequency sh of this CARS excitaton source and four-wave mixing effect, first electric-control system regulating optical power is adopted to realize wavelength tuning among a small circle, recycling nonlinear effect realizes dual wavelengh synchronized generation and tuning on a large scale, and all optical fibre structure ensure that system compactness and high reliability.
The present invention proposes a kind of based on the non-linear tuning single fiber type CARS excitation source apparatus of twin-stage, this device sequentially comprises 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, secondary tuner 9, light filter 10 and output port 11 from being input to output; Wherein:
Described femtosecond fiber LASER Light Source 1, for providing femtosecond linear polarization pulsed light, as the stokes light pulse seed source in CARS source, its pulse duration range 50 ~ 200fs, centre wavelength is 1020 ~ 1080nm, repetition frequency 10MHz ~ 100MHz, and pulse energy is greater than 1nJ;
Described automatically controlled optical power attenuation device 2, be made up of phase delay device and analyzer, for voltage being applied to the phase delay between phase delay device change horizontal polarization and vertical polarization, outgoing polarisation of light state is changed, power through analyzer changes, and realizes optical power attenuation and regulates;
Described voltage controller 3, for exporting control voltage, controls the pad value of automatically controlled power attenuator;
Described one-level tuner 4, is made up of photonic crystal fiber, for realizing wavelength tuning among a small circle to femtosecond pulse light, tuning range 10 ~ 40nm, tuning wavelength scope 10 ~ 40nm;
Described pulse stretcher 5, is made up of single mode and multimode optical fiber welding, for by Stokes optical pulse broadening to 30 ~ 80ps;
Described pump laser 6, adopts 980nm pump laser, for providing pumping continuous light to gain fibre;
Described wavelength division multiplexer 7, exports stokes light pulse combination by pumping continuous light and one-level tuner a branch of, is input in gain fibre;
Gain fibre 8, adopting Yb dosed optical fiber, for amplifying the Stokes light pulse after one-level tuner, making output pulse peak power at 3 ~ 20kW;
Described secondary tuner 9, is made up of photonic crystal fiber, utilizes the four-wave mixing effect of photonic crystal fiber tuning; One-level tuner 4 exports and after its photonic crystal fiber of high-peak power stokes light impulses injection formed after amplifying, produces signal pulse and ideler frequency light pulse by four-wave mixing effect; The wavelength dependence of signal pulse and ideler frequency light pulse is in the Stokes light pulse wavelength injected; Signal pulse is used as the pump light pulse in CARS source, and the tuning among a small circle of Stokes light pulse wavelength will cause the tuning of signal pulse on a large scale; The pump light pulse in CARS source and the frequency difference of Stokes light pulse cover 400 ~ 4000cm
-1the molecular vibration spectral limit of scope.
Described light filter 10, the pumping continuous light that ideler frequency light pulse and remaining pump laser for filtering secondary tuner export;
Output port 11, for the external fiber interface exported.
The invention allows for a kind of implementation method based on the non-linear tuning single fiber type CARS excitation source apparatus of twin-stage, the method comprises the following steps:
Femtosecond fiber LASER Light Source 1 provides femtosecond linear polarization pulsed light, as the stokes light pulse seed source in CARS source, and its pulse duration range 50 ~ 200fs, centre wavelength is 1030 ~ 1064nm, repetition frequency 10MHz ~ 100MHz, and pulse energy is greater than 1nJ;
Voltage controller 3 exports control voltage, thus controls the pad value of the automatically controlled optical power attenuation device 2 be made up of phase delay device and analyzer, realizes optical power attenuation and regulates;
Control one-level tuner 4 injected optical power, realize stokes light Pulse tuning, tuning wavelength scope 10 ~ 40nm;
Pulse stretcher 5 by Stokes optical pulse broadening to 30 ~ 80ps;
Pump laser 6 provides pumping continuous light to gain fibre;
By wavelength division multiplexer 7, pumping continuous light and one-level tuner are exported stokes light pulse combination a branch of, be input in gain fibre and amplify, the Stokes light pulse after one-level tuner 4 is tuning exports pulse peak power at 3 ~ 20kW after amplifying;
Output optical pulse is injected into secondary tuner 9, the four-wave mixing effect of photonic crystal fiber is utilized to produce signal pulse and ideler frequency light pulse, the wavelength dependence of signal pulse and ideler frequency light pulse is in the Stokes light pulse wavelength injected, signal pulse is used as the pump light pulse in CARS source, the tuning among a small circle of Stokes light pulse wavelength will cause the tuning of signal pulse on a large scale, and the frequency difference of Stokes light pulse and signal pulse covers 400 ~ 4000cm
-1the molecular vibration spectral limit of scope;
After the pump light adopting the ideler frequency light of light filter 10 filtering secondary tuner and pump laser to export, export the light pulse of two wavelength through output port 11.
Compared with prior art, the present invention has following technique effect:
What 1, the present invention proposed is simple based on the non-linear tuning single fiber type CARS excitation source apparatus structure of twin-stage, only has single fiber light path, without the need to beam splitting and delay adjustment part, and whole system mechanical moving component, reliability and stability improve greatly;
2, twin-stage tuning structure effectively reduces the enforcement difficulty of wide tunable range, expands the molecular vibration wave-number range of the covering in CARS source, and automatically controlled tuned speed is fast and have the natural synchronism of pulse, is conducive to realizing CARS real time imagery.
Accompanying drawing explanation
Fig. 1 is based on the non-linear tuning single fiber type CARS excitaton source system construction drawing of twin-stage;
Fig. 2 be in secondary tuner signal pulse and ideler frequency light pulse optical wavelength with the change curve injecting Stokes light pulse wavelength;
Fig. 3 is the spectrogram of flashlight and 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, 5, pulse stretcher, 6, pump laser source, 7, wavelength division multiplexer, 8, gain fibre, 9, secondary tuner, 10, light filter, 11, output port.
Embodiment
Below in conjunction with the drawings and the specific embodiments, be described in further detail technical scheme of the present invention.
Embodiment 1: a kind of based on the non-linear tuning single fiber type CARS excitation source apparatus of twin-stage
As shown in Figure 1, this device comprises 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, secondary tuner 9, light filter 10 and output port 11.
The femtosecond linear polarization pulsed light that femtosecond fiber LASER Light Source 1 exports enters automatically controlled optical power attenuation device 2 as stokes light pulse seed source, optical power attenuation value is controlled by voltage controller 3, light pulse after optical power attenuation enter one-level tuner 4 realize power control light pulse wavelength tuning, the pulsed light exported is through pulse stretcher 5 broadening, then the pumping continuous light exported with pump laser source 6 closes bundle and enters into gain fibre 8 in wavelength division multiplexer 7, realization is amplified into secondary tuner 9, produce signal pulse and ideler frequency light pulse, the light pulse of light filter 10 filtering ideler frequency and remaining pumping continuous light, light pulse and Stokes light pulse is outputed signal at output port 11.
Embodiment 2: a kind of based on the non-linear tuning single fiber type CARS excitaton source implementation method of twin-stage
Utilize femtosecond fiber LASER Light Source to provide femtosecond linear polarization pulsed light, as the stokes light pulse seed source in CARS source, its pulse duration range 50 ~ 200fs, centre wavelength is 1030 ~ 1064nm, repetition frequency 10MHz ~ 100MHz, and pulse energy is greater than 1nJ.Voltage controller exports control voltage, controls the pad value of the automatically controlled optical power attenuation device be made up of phase delay device and analyzer, realizes optical power attenuation and regulates.Form one-level tuner by photonic crystal fiber, by controlling injected optical power, utilizing the soliton self-frequency sh nonlinear effect of photonic crystal fiber, realizing stokes light Pulse tuning, tuning wavelength scope 10 ~ 40nm.Pulse stretcher is made up of, by Stokes optical pulse broadening to 30 ~ 80ps single mode and multimode optical fiber welding.980nm pump laser provides pumping continuous light to gain fibre, by wavelength division multiplexer, pumping continuous light and one-level tuner are exported stokes light pulse combination a branch of, be input in gain fibre and amplify, the Stokes light pulse after one-level tuner is tuning exports pulse peak power at 3 ~ 20kW after amplifying.Output optical pulse is injected into the secondary tuner be made up of photonic crystal fiber, the four-wave mixing effect of photonic crystal fiber is utilized to produce signal pulse and ideler frequency light pulse, the wavelength dependence of signal pulse and ideler frequency light pulse is in the Stokes light pulse wavelength injected, signal pulse is used as the pump light pulse in CARS source, and the tuning among a small circle of Stokes light pulse wavelength will cause the tuning of signal pulse on a large scale.The frequency difference of Stokes light pulse and signal pulse covers 400 ~ 4000cm
-1the molecular vibration spectral limit of scope.After adopting light filter filtering to be used for the ideler frequency light of filtering secondary tuner and the pump light of pump laser output, export the light pulse of two wavelength through output port.
As shown in Figure 2, when injecting the stokes light pulse peak power 3kW of LMA-8 photonic crystal fiber of NKT company, the wavelength of signal pulse and ideler frequency light pulse is with the change of Stokes light pulse wavelength.
As shown in Figure 3, be the spectrogram of the flashlight that produces after stokes light impulses injection and ideler frequency light.Signal pulse is used as the pump light pulse in CARS source, and the tuning among a small circle of Stokes light pulse wavelength will cause the tuning of signal pulse on a large scale.The frequency difference of Stokes light pulse and signal pulse covers 400 ~ 4000cm
-1the molecular vibration spectral limit of scope.After adopting light filter 10 filtering to be used for the ideler frequency light of filtering secondary tuner and the pump light of pump laser output, export the light pulse of CARS excitaton source two wavelength through output port 11.
Embodiment 3: applicating example
The signal pulse that this CARS source exports and Stokes light pulse, wherein signal pulse is used as the pump light pulse in CARS source.Under the pump light pulse in CARS source and the two-beam pulse action of Stokes light pulse, first excite in determinand with the molecular vibration of pump light pulse and the difference resonance of stokes light pulse frequency, make it produce resonance, the pump light that CARS source exports is converted into anti-Stokes light thus realizes the detection to specific molecular by molecular vibration in a large number that then produce resonance.Tuning by twin-stage, the pump light pulse in CARS source and Stokes light pulse cover wave number 400 ~ 4000cm
-1molecular vibration, thus meet in biological chemistry to molecular vibration spectrum measurement and specific molecular be excited into picture.
Claims (2)
1. one kind based on the non-linear tuning single fiber type CARS excitation source apparatus of twin-stage, it is characterized in that, this device sequentially comprises 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), secondary tuner (9), light filter (10) and output port (11) from being input to output; Wherein:
Described femtosecond fiber LASER Light Source (1), for providing femtosecond linear polarization pulsed light, as the stokes light pulse seed source in CARS source, its pulse duration range 50 ~ 200fs, centre wavelength is 1020 ~ 1080nm, repetition frequency 10MHz ~ 100MHz, and pulse energy is greater than 1nJ;
Described automatically controlled optical power attenuation device (2), be made up of phase delay device and analyzer, for voltage being applied to the phase delay between phase delay device change horizontal polarization and vertical polarization, outgoing polarisation of light state is changed, power through analyzer changes, and realizes optical power attenuation and regulates;
Described voltage controller (3), for exporting control voltage, controls the pad value of automatically controlled power attenuator;
Described one-level tuner (4), is made up of photonic crystal fiber, for realizing wavelength tuning among a small circle to femtosecond pulse light, tuning range 10 ~ 40nm;
Described pulse stretcher (5), is made up of single mode and multimode optical fiber welding, for by Stokes optical pulse broadening to 30 ~ 80ps;
Described pump laser (6), adopts 980nm pump laser, for providing pumping continuous light to gain fibre;
Described wavelength division multiplexer (7), exports stokes light pulse combination by pumping continuous light and one-level tuner a branch of, is input in gain fibre;
Gain fibre (8), adopting Yb dosed optical fiber, for amplifying the Stokes light pulse after one-level tuner, making output pulse peak power at 3 ~ 20kW;
Described secondary tuner (9), is made up of photonic crystal fiber, utilizes the four-wave mixing effect of photonic crystal fiber tuning; One-level tuner (4) exports and after the high-peak power stokes light impulses injection photonic crystal fiber formed after amplifying, produces signal pulse and ideler frequency light pulse by four-wave mixing effect; The wavelength dependence of signal pulse and ideler frequency light pulse is in the Stokes light pulse wavelength injected; Signal pulse is used as the pump light pulse in CARS source, and the tuning among a small circle of Stokes light pulse wavelength will cause the tuning of signal pulse on a large scale; The pump light pulse in CARS source and the frequency difference of Stokes light pulse cover 400 ~ 4000cm
-1the molecular vibration spectral limit of scope;
Described light filter (10), the pumping continuous light that ideler frequency light pulse and remaining pump laser for filtering secondary tuner export;
Output port (11), for the external fiber interface exported.
2. a kind of implementation method based on the non-linear tuning single fiber type CARS excitation source apparatus of twin-stage as claimed in claim 1, it is characterized in that, the method comprises the following steps:
Femtosecond fiber LASER Light Source (1) provides femtosecond linear polarization pulsed light, as the stokes light pulse seed source in CARS source, its pulse duration range 50 ~ 200fs, centre wavelength is 1030 ~ 1064nm, repetition frequency 10MHz ~ 100MHz, pulse energy is greater than 1nJ;
Voltage controller (3) exports control voltage, thus controls the pad value of the automatically controlled optical power attenuation device (2) be made up of phase delay device and analyzer, realizes optical power attenuation and regulates;
Control one-level tuner (4) injected optical power, realize stokes light Pulse tuning, tuning wavelength scope 10 ~ 40nm;
Pulse stretcher (5) by Stokes optical pulse broadening to 30 ~ 80ps;
Pump laser (6) provides pumping continuous light to gain fibre;
By wavelength division multiplexer (7), pumping continuous light and one-level tuner are exported stokes light pulse combination a branch of, be input in gain fibre and amplify, the Stokes light pulse after one-level tuner (4) is tuning exports pulse peak power at 3 ~ 20kW after amplifying;
Output optical pulse is injected into secondary tuner (9), the four-wave mixing effect of photonic crystal fiber is utilized to produce signal pulse and ideler frequency light pulse, the wavelength dependence of signal pulse and ideler frequency light pulse is in the Stokes light pulse wavelength injected, signal pulse is used as the pump light pulse in CARS source, the tuning among a small circle of Stokes light pulse wavelength will cause the tuning of signal pulse on a large scale, and the frequency difference of Stokes light pulse and signal pulse covers 400 ~ 4000cm
-1the molecular vibration spectral limit of scope;
After the pump light adopting the ideler frequency light of light filter (10) filtering secondary tuner and pump laser to export, export the light pulse of two wavelength through output port (11).
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Cited By (5)
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| CN106680260A (en) * | 2015-11-05 | 2017-05-17 | 中国科学院大连化学物理研究所 | Portable coherent anti-Stokes Raman spectrometer |
| CN107368284A (en) * | 2017-07-25 | 2017-11-21 | 太原理工大学 | Full light quantum random-number generating method and device are realized using four-wave mixing effect |
| CN107589613A (en) * | 2017-08-18 | 2018-01-16 | 天津大学 | Multiple spot output CARS excitation source apparatus and production method based on more orphan's synchronous scannings |
| CN111442851A (en) * | 2020-04-13 | 2020-07-24 | 重庆大学 | Time lens measuring system based on Raman soliton self-frequency shift |
| CN113285344A (en) * | 2021-04-02 | 2021-08-20 | 华东师范大学重庆研究院 | Wide-band tunable two-color ultrafast pulse synchronization technology |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106680260A (en) * | 2015-11-05 | 2017-05-17 | 中国科学院大连化学物理研究所 | Portable coherent anti-Stokes Raman spectrometer |
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| CN107368284A (en) * | 2017-07-25 | 2017-11-21 | 太原理工大学 | Full light quantum random-number generating method and device are realized using four-wave mixing effect |
| 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 |
| CN107589613A (en) * | 2017-08-18 | 2018-01-16 | 天津大学 | Multiple spot output CARS excitation source apparatus and production method based on more orphan's synchronous scannings |
| 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 |
| CN111442851A (en) * | 2020-04-13 | 2020-07-24 | 重庆大学 | Time lens measuring system based on Raman soliton self-frequency shift |
| CN111442851B (en) * | 2020-04-13 | 2021-01-29 | 重庆大学 | Time lens measuring system based on Raman soliton self-frequency shift |
| CN113285344A (en) * | 2021-04-02 | 2021-08-20 | 华东师范大学重庆研究院 | Wide-band tunable two-color ultrafast pulse synchronization technology |
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