CN106769998A - Based on the tera-hertz spectra real-time analysis method for actively modulating pulse non-linear amplification - Google Patents
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Abstract
Concretely it is a kind of tera-hertz spectra real-time analysis method the present invention relates to ultrafast opto-electronics field.The method prepares two repetition rate accurate locks and has the femtosecond laser light source of certain difference by active modulation pulse non-linear amplification process, and the repetition rate and two repetition rate differences of LASER Light Source of every femtosecond laser light source can carry out active regulation.Terahertz pulse is produced using two femtosecond laser light sources as pumping source pumping, by the Asynchronous Sampling of two pulses, terahertz light spectrum information is obtained in real time.
Description
Technical field
The present invention relates to a kind of based on the tera-hertz spectra real-time analysis method for actively modulating pulse non-linear amplification, belong to
Ultrafast opto-electronics technical field.
Background technology
Asynchronous optical sampling Terahertz (Terahertz) spectroscopic analysis methods be latest developments get up it is competitive too
Hertz spectroscopic analysis methods.Its basic functional principle is will to change to rf frequency to realize quick detection under optical frequency.Utilize
Two repetition rate accurate locks but slightly differentiated femtosecond laser respectively as Terahertz pumping and detection light, without complicated
Scanning can be sampled easily by controlling femtosecond pulse time delay to obtain periodicity ultra-fast optical, greatly shorten spectrum point
The time of analysis.
Modulation to repetition rate in laser system at present is mainly passive type regulation, by the electrostriction of piezoelectric ceramics
Control the chamber repetition rate so as to control laser long of laserresonator.This method lacks in application process in the presence of some
Point：It is steady in a long-term poor etc. than if desired for high operation voltage, high to operating environment requirements.
The content of the invention
The present invention is directed to during conventional asynchronous optical sampling, and LASER Light Source is high to environmental requirement, long-time stability are poor etc.
Deficiency, proposes that the side for preparing repetition rate accurate lock and the femtosecond laser light source for having certain difference is amplified in a kind of active modulation
Method, and the real-time analysis to terahertz light spectrum information is completed on this basis.
The present invention is achieved by the following technical solutions：
The present invention provides a kind of based on the tera-hertz spectra real-time analysis method for actively modulating pulse non-linear amplification, its bag
Include following steps：
S1：Build the first femtosecond laser light source of repetition rate accurate lock；
S2：The first femto-second laser pulse is obtained using first femtosecond laser light source；
S3：Using with step S1 and S2 identical method building repetition rate locking and repetition rate and the first femtosecond swash
The repetition rate of radiant has the second femtosecond laser light source of difference, and it is winged to obtain second using second femtosecond laser light source
Second laser pulse；
S4：Using the first femto-second laser pulse pumping semiconductor antenna or electro-optic crystal, terahertz pulse is obtained；
S5：It is sampling light with second femto-second laser pulse, detection is sampled to the terahertz pulse, realizes too
The real-time analysis of hertz spectrum.
Preferably, the building method of first femtosecond laser light source and the second femtosecond laser light source is modulation
Amplifying method.
Preferably, step S2 specifically includes following operation：
The laser pulse signal that the repetition rate that first femtosecond laser light source is produced determines is amplifying laser pulse power
After carry out spectrum widening, then carry out successively it is non-linear amplification and wide spectrum pulse compression, obtain the first femto-second laser pulse.
Preferably, the continuous laser used in step S1~S3 is same continuous laser.
Preferably, the sampling detection time in step S5 is by the first femtosecond laser light source and the second femtosecond laser light
The repetition rate difference in source determines that τ=1/ δ f, wherein τ are sampling detection time, and δ f are the repetition rate of two femtosecond laser light sources
Difference.
More specifically, the method for the present invention comprises the following steps：
1st, the femtosecond laser light source of repetition rate accurate lock is built by modulating amplification process, completes to repeat frequency to laser
The active regulation of rate.
Using signal source output with the periodically variable electric signals of frequency f, this electric signal is applied to step and recovers two poles
Pipe, with the cyclically-varying of input signal, it is f to export repetition rate in load, and pulse width is step-recovery diode
The electric impulse signal of snap time t (ps magnitudes).The continuous laser input intensity modulator that continuous laser source is exported, utilizes
The width of generation is modulated in the electric impulse signal of ps magnitudes to intensity modulator, and output repetition rate repeats frequency with electric pulse
Rate is identical, the pulse width laser pulse signal similar to electric impulse signal width.Electricity is exported by regulation or locking signal source
The repetition rate f of signal, is capable of achieving the active regulation or locking to the femtosecond laser repetition rate.
2nd, pulse non-linear amplification is actively modulated, using the non-linear amplification of multi-stage cascade, video stretching is realized.
The laser pulse signal that the repetition rate that will be produced determines is input into multi-stage cascade amplification module, amplifies laser pulse work(
Rate, then input spectrum broadening module obtains that pulse width is certain, power is higher, repetition rate locking and can be by changing electricity
The laser pulse signal that pulse recurrence frequency is adjusted.By this laser pulse signal unbalanced input amplification module, output foot
Enough spectral widths, energy laser pulse higher.
3rd, the wide spectrum pulse compression after pulse non-linear amplifies actively is modulated, femto-second laser pulse is obtained.
Pulse after video stretching amplification, is input into pulse width compression device, obtains pulse width in femtosecond (fs) magnitude, repetition
The femtosecond laser that frequency determines.
4th, using same step 1~3 identical mode, build repetition rate accurate lock, and with step 1~3 in laser
Repetition rate has the femtosecond laser light source of value of delta f.
5th, ensure that step 1~3 are from same continuous laser with the continuous laser that step 4 is used.This can be by same
One continuous laser (narrow or ultra-narrow breadth of spectrum line single longitudinal mode laser, such as single-mode ld of narrow spectral line) beam splitting comes real
Existing, such femtosecond pulse generation device (step 1~3 and step 4) output repetition rate is respectively the femtosecond pulse of f and f+ δ f,
The carrier envelope phase of two femtosecond lasers of different repetition rates follows the frequency of continuous laser all automatically coherently.
6th, using the femtosecond laser light source pumping semiconductor antenna or electro-optic crystal obtained in step 1~3, Terahertz is produced
Pulse.
7th, the repetition rate that step 4 is obtained for (f+ δ f) femtosecond laser light source as sampling light, to the terahertz in step 3
Hereby pulse is sampled detection.The sampling detection time determines that it is right to realize by two femtosecond laser light source repetition rate value of delta f
Tera-hertz spectra is analyzed in real time.
8th, because femtosecond generation device (step 1~3 and step 4) can automatically ensure that two femtoseconds of different repetition rates swash
The carrier envelope phase of light follows the frequency of continuous laser all automatically coherently, without the femtosecond pulse to driving Terahertz to produce
The femtosecond pulse (repetition rate is f+ δ f) of (repetition rate is f), Terahertz Asynchronous Sampling, the behaviour for implementing carrier envelope phase
Control, you can realize high-precision Terahertz Asynchronous Sampling.
9th, active Modulation and Nonlinear is amplified (step 1~3 and step 4) and can also be completed in the link of same light amplification, this
Sample can further lower the noise of amplification process, it is ensured that the femtosecond laser of two different repetition rates experiences in amplification process
Identical carrier envelope phase drifts about.
10th, two the femtosecond laser pumping semiconductor antennas or electric light of different repetition rates that same optically amplified link is produced
Crystal, produces two Terahertz frequency combs of different repetition rates, i.e. repetition rate is respectively the Terahertz frequency of f and f+ δ f
Comb, its carrier wave position is mutually 0.The sampling of its Terahertz frequency comb, can realize beat signal with the femtosecond pulse that repetition rate is f
Sampling, completes the detection of optics Asynchronous Sampling and Terahertz spectrum analysis.
Compared with prior art, the present invention has following beneficial effect：
The locking and regulation of LASER Light Source repetition rate are completed using active electric light modulation effect, is passed through on this basis
Control femto-second laser pulse time delay obtains the sampling of periodicity ultra-fast optical, and terahertz light analysis of spectrum is obtained in real time.
Brief description of the drawings
The detailed description made to non-limiting example with reference to the following drawings by reading, further feature of the invention,
Objects and advantages will become more apparent upon：
Fig. 1 is the figure of the method flow of technical solution of the present invention；
Fig. 2 is the detection principle figure of the method for the present invention.
Specific embodiment
With reference to specific embodiment, the present invention is described in detail.Following examples will be helpful to the technology of this area
Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that to the ordinary skill of this area
For personnel, without departing from the inventive concept of the premise, various modifications and improvements can be made.These belong to the present invention
Protection domain.
As shown in figure 1, the output repetition rate of femtosecond pulse generation device 01 is f, pulse width swashs in the femtosecond of fs magnitudes
Light pulse.Wherein, 101 is electric pulse generation module, wherein using signal source output with the periodically variable electric signals of frequency f,
This electric signal is applied to step-recovery diode, with the cyclically-varying of input signal, the output time-domain interval in load
It is T=1/f, pulse width is the electric impulse signal of step-recovery diode snap time t (ps magnitudes).102 is continuous laser
Light source, the ps magnitudes that output continuous laser is exported to 103 intensity modulators, intensity modulator 103 by electric impulse production device 101
Electric impulse signal is modulated, consistent so as to obtain pulse width similar with electronic pulse width, repetition rate and signal source output frequency
Laser pulse signal.Continuous laser source 104,107, wavelength division multiplexer 105,108, the composition of gain fibre 106,109 is multistage
Cascaded amplification module, the laser pulse to the output of intensity modulator 103 is amplified.Laser pulse input spectrum exhibition after amplification
Module wide 110, stretched-out spectrum.Then it is input into by continuous laser source 111, wavelength division multiplexer 112, non-linear gain optical fiber 113
The non-linear amplification module of composition, to the further amplification of laser power.Finally by laser pulse input Pulse Compression module 114,
Realize compressing laser pulse width, obtain LASER Light Source of the pulse width in fs magnitudes.The fs LASER Light Source repetition rates are accurately locked
It is set to f.
Identical with the process in 01 device in Fig. 1, the output repetition rate of femtosecond pulse generation device 02 is f+ δ f, pulse
Femto-second laser pulse of the width in fs magnitudes.The femto-second laser pulse of the output of device 02 and the femto-second laser pulse of the output of device 01
Repetition rate differs δ f, and the difference is adjusted by the signal source output frequency in electric impulse production device 201.101 and 201 need to come
Same continuous wave laser is come from, this can be realized by same continuous laser beam splitting, such He of femtosecond pulse generation device 01
02 output repetition rate is respectively the femtosecond pulse of f and f+ δ f, two carrier envelope phases of the femtosecond laser of different repetition rates
Position follows the frequency of continuous laser all automatically coherently, continuous laser can select narrow or ultra-narrow breadth of spectrum line single longitudinal mode laser,
Such as the single-mode ld of narrow spectral line.
In Fig. 1,03 is Terahertz generation device, can be photoconductive antenna or electro-optic crystal.The femtosecond of the output of device 01
Laser action produces terahertz pulse to Terahertz generation device 03.
In Fig. 1,04 is Terahertz collection module, is made up of a pair gold-plated off axis paraboloidal mirrors, is completed to THz wave
Collecting action.
In Fig. 1,05 is terahertz detection device, is made up of photoconductive antenna 501 and data acquisition module 502.Device 02
The femto-second laser pulse of output is applied to photoconductive antenna 501, and light is sampled as THz wave.The data that sampling is obtained are by 502
Gather and export, obtain terahertz light spectrum information.
Such as Fig. 2, repetition rate is the femtosecond laser pumping driving generation terahertz pulse 01 of f, the weight of the terahertz pulse
Complex frequency is consistent with the repetition rate of femtosecond laser, is f.Repetition rate is the femtosecond laser of (f+ δ f) as terahertz detection
Sampling pulse 02, wherein, δ f<<f.In time domain, its pulse spacing difference δ T=T/s, wherein T=1/f is terahertz pulse
Pulse spacing, s=f/ δ f are usually set to a very big number (with s=104~106As a example by), this equivalent to every δ T when
Between implement an optical sampling, N=T/2 δ T=s/2 optical sampling one sampling period of completion, whole sampling period are implemented altogether
It is Ts=NT~Ts/2, on frequency domain, has the s/2 frequency spectrum sample point of asynchronous optical sampling, frequency of each sample point etc.
The optical frequency for ω=fs in frequency is imitated, the spectral range of Δ ω=fs/2 is covered altogether.With the repetition rate of f~1GHz, δ f~
As a example by 100kHz repetitions interval, the time of asynchronous optics sampling period is completed for Ts=1ns × 104/ 2=5 μ s, its frequency spectrum
Coverage is Δ ω=fs/2~5 Terahertz, you can realize that 0~5 Terahertz spectrum scan is (total in the cycle of 5 μ s
5000 optical sampling points).03 is to collect terahertz time-domain figure by Asynchronous Sampling, and 04 terahertz is obtained by Fourier transformation
Hereby spectral information, so as to complete terahertz light spectrum information analyze in real time.
Specific embodiment of the invention is described above.It is to be appreciated that the invention is not limited in above-mentioned
Particular implementation, those skilled in the art can within the scope of the claims make various deformations or amendments, this not shadow
Sound substance of the invention.
Claims (5)
1. a kind of based on the tera-hertz spectra real-time analysis method for actively modulating pulse non-linear amplification, it is characterised in that including
Following steps：
S1：Build the first femtosecond laser light source of repetition rate accurate lock；
S2：The first femto-second laser pulse is obtained using first femtosecond laser light source；
S3：Repetition rate locking is built using with step S1 and S2 identical method and repetition rate and the first femtosecond laser light
The repetition rate in source has the second femtosecond laser light source of difference, and it is sharp to obtain the second femtosecond using second femtosecond laser light source
Light pulse；
S4：Using the first femto-second laser pulse pumping semiconductor antenna or electro-optic crystal, terahertz pulse is obtained；
S5：It is sampling light with second femto-second laser pulse, detection is sampled to the terahertz pulse, realizes Terahertz
The real-time analysis of spectrum.
2. as claimed in claim 1 based on the tera-hertz spectra real-time analysis method for actively modulating pulse non-linear amplification, its
It is characterised by, the building method of first femtosecond laser light source and the second femtosecond laser light source is modulation amplifying method.
3. as claimed in claim 1 based on the tera-hertz spectra real-time analysis method for actively modulating pulse non-linear amplification, its
It is characterised by, step S2 specifically includes following operation：
The laser pulse signal that the repetition rate that first femtosecond laser light source is produced determines is laggard in amplification laser pulse power
After row spectrum widening, non-linear amplification and wide spectrum pulse compression are carried out successively, obtain the first femto-second laser pulse.
4. as claimed in claim 1 based on the tera-hertz spectra real-time analysis method for actively modulating pulse non-linear amplification, its
It is characterised by, the continuous laser used in step S1~S3 is same continuous laser.
5. as claimed in claim 1 based on the tera-hertz spectra real-time analysis method for actively modulating pulse non-linear amplification, its
It is characterised by, the sampling detection time in step S5 is by the first femtosecond laser light source and the repetition rate of the second femtosecond laser light source
Difference is determined.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110376156A (en) * | 2019-07-30 | 2019-10-25 | 上海理工大学 | The THz wave spectra system that asynchronous optical sampling and double light combs integrate |
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Effective date of registration: 20180426 Address after: 200237 District 2319, room 69, Lane 1985, Chunshen Road, Minhang District, Shanghai 1 district. Applicant after: Shanghai Langyan Optoelectronics Technology Co.,Ltd. Applicant after: East China Normal University Address before: 200237 District 2319, room 69, Lane 1985, Chunshen Road, Minhang District, Shanghai 1 district. Applicant before: Shanghai Langyan Optoelectronics Technology Co.,Ltd. |
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