CN105823559B - A kind of adaptive double light comb spectrally compensating method for extracting signal - Google Patents
A kind of adaptive double light comb spectrally compensating method for extracting signal Download PDFInfo
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Abstract
The invention discloses a kind of adaptive double light comb spectrally compensating signal extraction systems, it is characterized in that Michelson's interferometer and electricity beat frequency obtain adaptive double light comb spectrally compensating signals, by the way of time domain delay and frequency domain selection, effectively utilize the front and rear pulse of Michelson's interferometer coherent detection certain time-delay, extract the signal for characterizing the shake of individual pulse laser itself repetition rate and carrier envelope phase shake, finally by electricity frequency multiplication and optical mixing process, obtain the thermal compensation signal for characterizing that two pulse lasers are shaken with respect to repetition rate and relative carrier envelope phase is shaken, it can be directly used for adaptive double light comb spectral measurements.The present invention completely avoid the mode for needing to introduce two narrow linewidth continuous wave laser extraction thermal compensation signals in adaptive double light comb spectrum compared with prior art, thermal compensation signal is disturbed small by continuous optical wavelength drift, signal stabilization is reliable, further increases the stability and reliability of adaptive double light comb spectroscopic systems.
Description
Technical field
It is specifically a kind of to be based on the adaptive of Michelson's interferometer the present invention relates to technical field of photoelectric detection
Should double light comb spectrally compensating method for extracting signal.
Background technology
Advanced subject of double light comb spectral techniques as scientific research field in recent years, it can greatly improve the essence of spectrographic detection
Degree.Double light comb spectrographic detection technologies have two improvement compared to conventional art, first, conventional light source is substituted using light comb, as standard
Frequency spectrum position it is more stable, line width is narrower, and precision is higher；Another is to use the slightly discrepant light comb of two repetition rates
Measure simultaneously, a conduct refers to light comb, and a conduct excites light comb, similar to the main scale and secondary ruler of slide measure, passes through frequency
Rate misplaces and beat frequency detection, further improves the precision of frequency measurement.The adaptive double light comb spectral techniques to grow up in the recent period,
Using two narrow linewidth continuous wave lasers and two ultrashort pulse laser beat frequencies, then be mixed through oversampling circuit, frequency multiplication, amplification, filter
Ripple processing, obtain and characterize two ultrashort pulse lasers with respect to repetition rate shake and the compensation of relative carrier envelope phase shake
Signal, the asynchronous-sampling that the signal of relative repetition rate shake is used for during spectrographic detection is characterized, characterizes relative carrier envelope
The signal of phase jitter is mixed for spectrum interference signal, and the influence of shake is finally eliminated in signal processing stage, is realized high-precision
Spend spectrographic detection.
In current adaptive double light comb spectroscopic systems, the source of thermal compensation signal from two narrow linewidth continuous wave lasers and
The mutual optical beat of two ultrashort pulse lasers, due to environment temperature, vibration change, every narrow linewidth laser or super
The optical frequency of short-pulse laser can be with time random drift, and therefore, the centre frequency of optical beat signal also can be random with the time
Drift, and drift scope is very big, it is easy to beyond the bandwidth of circuit filter, cause beat signal to be lost, processing of circuit
Module Fail, adaptive equalization system operation irregularity.For control narrow linewidth continuous wave laser and the optics of ultrashort pulse laser
Beat signal drift scope, can by establishing feedback loop, by adjust the temperature of continuous wave laser, pump power or
The parameters such as the repetition rate of pulse laser, by both beat frequency drift controls within the bandwidth of subsequent conditioning circuit wave filter, but
It is that the compensation way of this negative-feedback will necessarily interfere to adaptive light comb spectrum, reduces the measurement accuracy of system.
Adaptive double light comb spectroscopic systems of prior art, its thermal compensation signal extracting mode must connect first by narrow linewidth
, the major hidden danger of beat signal loss be present, influence system and operate for a long time in continuous laser and ultrashort pulse laser optical beat
Stability, reliability.
The content of the invention
A kind of adaptive double light comb spectrally compensating signals that the purpose of the present invention is in view of the shortcomings of the prior art and provided
Extracting method, measure the frequency jitter of two ultrashort pulse lasers respectively using two independent Michelson's interferometers, profit
The mode selected with time domain delay and frequency domain, extract and characterize two pulse lasers with respect to repetition rate shake and relative carrier wave
The signal of envelope phase shake, double light comb spectral measurements are realized, without carrying out repetition rate or carrier wave bag to pulse laser
The active control of network phase, avoid the continuous light of narrow linewidth in traditional adaptive double light comb spectrally compensating signal extraction modes and surpass
The optical frequency drift of short-pulse laser, ensure that beat signal exists steadily in the long term, preferably resolve optical beat signal drift and lead
The thermal compensation signal of cause loses problem, and simple system is easy to operate, substantially increases the steady of adaptive double light comb spectral measurement systems
It is qualitative.
The object of the present invention is achieved like this：A kind of adaptive double light comb spectrally compensating method for extracting signal, including it is super
Short-pulse laser, photodetector, electricity frequency multiplication and filter unit and double light comb spectroscopic data processing units, are characterized in adopting
The frequency jitter of two ultrashort pulse lasers is measured respectively with two independent Michelson's interferometers, then by two Michaels
The output light of inferior interferometer respectively enters two optical beam-splitters, and output light is respectively coupled to four optics and filtered by two optical beam-splitters
Ripple device, filtered four optical signals are detected by four photodetectors respectively, and each photodetector is by the light of detection
Signal averaging is divided into two-way output, and output light is entered respectively successively after electricity frequency multiplication and filter unit with another way output light all the way
Enter one-level mixing and two level mixing, then believe the optical signal after two level Frequency mixing processing as the compensation of adaptive double light comb spectrum
Number double light comb spectroscopic data processing units of access；It is defeated that the optical signal detected is equally divided into two-way by each photodetector
Go out and separately detect to obtain 1., 2., 3. and 4. four optical signals for four photodetectors, it is defeated that each optical signal is equally divided into two-way
Go out, 1. and 2. two optical signals that two photodetectors export all the way enter one after two electricity frequencys multiplication and filter unit respectively
Level mixing, 1. and 2. two optical signals of two photodetector another ways output are directly entered one-level mixing respectively；Another two photoelectricity
3. and 4. two optical signals that detector exports all the way enter respectively after another two electricity frequency multiplication and filter unit another one
Level mixing, the output of another two photodetectors another way 3. and 4. two optical signals are directly entered the mixing of another one-level respectively；
Two electricity frequencys multiplication and filter unit in four electricity frequencys multiplication and filter unit are respectively to 1. and 3. optical signal makees (p-1)
Process of frequency multiplication again, another two electricity frequency multiplication and filter unit obtain respectively respectively to 2. and 4. optical signal makees p times of process of frequency multiplication
Signal to after 1. × (p-1), 2. × p, 3. × (p-1) and 4. × frequencys multiplication of p tetra-, by 1. × (p-1), the 2. × p after frequency multiplication
The 1. and 2. optical signal of non-frequency multiplication is mixed into one-level, one-level mixing will 1. × (p-1) with 1., 2. × p and optical signal 2.
After mixing, respectively obtain 1. -2. and 2. × p- 1. × (p-1) two mixing optical signal；By 3. × (p-1) after frequency multiplication, 4.
× p and non-frequency multiplication 3., 4. optical signal is mixed into another one-level, the mixing of another one-level will 3. × (p-1) with 3., 4. ×
P with 4. optical signal mixing after, respectively obtain 3. -4. and 4. × p- 3. × (p-1) two mixing optical signal, then will 1. -
2., 2. × p- 1. × (p-1) two mixing optical signal and 3. -4. and 4. × p- 3. × (p-1) two mixing optical signal divide
Not Jin Ru two level mixing, (1. -2.)-(3. -4.) and [2. × p- is 1. × (p-1)]-[4. are respectively obtained after two level Frequency mixing processing
× p- is 3. × (p-1)] two double light comb spectroscopic data processing units of thermal compensation signal access as adaptively double light comb spectrum；Institute
The thermal compensation signal for stating two adaptive double light comb spectrum is respectively (n-m) △ frWith △ f0+q△fr, wherein：△frIt is super for two
The relative repetition rate shake of short-pulse laser；△f0Relative carrier envelope phase for two ultrashort pulse lasers is trembled
It is dynamic；P, n and m is positive integer.
The Michelson's interferometer include beam splitting chip or fiber coupler, two faraday's speculums, delay crystal or
Time delay optical fiber and the acousto-optic modulator with driving, the output light of ultrashort pulse laser press work(by beam splitting chip or fiber coupler
Rate ratio is 1:1 is divided into two-beam, and light beam is directly over the reflection of first faraday's speculum, returns to beam splitting chip or fiber coupling
Device, another light beam first pass through delay crystal or time delay optical fiber, then by the acousto-optic modulator with driving, finally by second farad
Speculum reflects, and returns to beam splitting chip or fiber coupling through the acousto-optic modulator with driving and delay crystal or time delay optical fiber successively
Device, two beam reflected lights synthesize a branch of from Michelson's interferometer output on beam splitting chip or fiber coupler.
The optical beam-splitter is 1:The semi-transparent semi-reflecting eyeglass or fiber coupler of 1 splitting ratio.
The optical filter is the laser for allowing specific wavelength by completely cutting off the narrow-band filtering that other wavelength lasers pass through
Eyeglass, fiber grating or optical fiber filter.
The present invention has advantages below compared with prior art：
(1) the optical beat of narrow linewidth continuous wave laser and continuous wave laser and pulse laser, is not needed, therefore is kept away
Exempt from the randomized jitter of optical beat signal, improve the stability and reliability of adaptive double light comb spectrally compensating systems.
(2), the frequency jitter of two ultrashort pulse lasers is measured respectively using two independent Michelson's interferometers,
Noiseless each other, detection noise is low.
(3), by the way of frequency domain selection, in the beat signal of two different frequency window coherent detection pulses, pass through
Flexibly selection frequency interval and window size, Frequency domain noise can be reduced, improve detectivity.
(4) the acousto-optic modulator with driving, is added in Michelson's interferometer, the carrier deviation of beat signal is arrived
The centre frequency of acousto-optic modulator, reduce the noise near zero-frequency.
(5) the drift of negative-feedback circuit thermal compensation signal, need not be additionally established, noise in electronic circuits will not be introduced, height can be realized
Adaptive double light comb spectrum of precision.
(6), double light comb spectrum are can be achieved with using two pulse lasers and adaptive control technology of free-running to survey
Amount, it is easy to operate without the active control to pulse laser progress repetition rate or carrier envelope phase, simple system.
Brief description of the drawings
Fig. 1 is schematic structural view of the invention；
Fig. 2 is the example structure schematic diagram of space structure；
Fig. 3 is the example structure schematic diagram of optical fiber structure；
Fig. 4 specifically uses schematic diagram for the present invention.
Embodiment
Refering to accompanying drawing 1, the present invention is by two Michelson's interferometer 2, two of ultrashort pulse laser 1, two optics point
6, the two one-level mixing 7 of 5, the four electricity frequencys multiplication of the photodetector of optical filter 4, four of beam device 3, four and filter unit,
One two level mixing 8 and double light comb spectroscopic data processing units 9 form the light path of two thermal compensation signals, a ultra-short pulse laser
The output light of device 1 incides Michelson's interferometer 2, and the longer interfere arm of light path includes a band in Michelson's interferometer 2
The acousto-optic modulator of driving, modulating frequency fa, the output light of Michelson's interferometer 2 pass through an optical beam-splitter 3, respectively coupling
Close to two optical filters 4, filtered optical signalling is measured respectively using two photodetectors 5, the signal detected point
1. and 2. it is not designated as, 1. signal can be expressed as 2fa+△(nfr1+f01+2fa), n is positive integer, and its centre frequency is in 2fa, letter
Number drift include the repetition rate drift △ f of ultrashort pulse laser 1r1, carrier envelope phase drift △ f01And acousto-optic modulation
The drift △ f of device driving frequencya, 2. signal can be expressed as 2fa+△(mfr1+f01+2fa), m is positive integer, its centre frequency
In 2fa, the drift of signal includes repetition rate drift, carrier envelope phase drift and the acousto-optic modulation of ultrashort pulse laser 1
The drift of device driving frequency；The output light of another ultrashort pulse laser 1 incides another Michelson's interferometer 2, Ling Yimai
The longer interfere arm of light path includes an acousto-optic modulator with driving, modulating frequency fb, Ling Yimai in Ke Erxun interferometers 2
The output light of Ke Erxun interferometers 2 is respectively coupled to another two optical filter 4, using another two through another optical beam-splitter 2
3. and 4. photodetector 4 measures filtered optical signalling respectively, and the signal detected is designated as respectively, and 3. signal can represent
For 2fb+△(nfr2+f02+2fb), n is positive integer, and its centre frequency includes another ultra-short pulse laser in 2fb, the drift of signal
The repetition rate drift △ f of device 1r2, carrier envelope phase drift △ f02With the drift △ f of acousto-optic modulator driving frequencyb, 4. believe
Number it can be expressed as 2fb+△(mfr2+f02+2fb), m is positive integer, and its centre frequency includes another surpass in 2fb, the drift of signal
Repetition rate drift, carrier envelope phase drift and the drift of acousto-optic modulator driving frequency of short-pulse laser 1；Each light
The signal that electric explorer 5 detects is equally divided into two-way, all the way not frequency multiplication, is divided all the way using electricity frequency multiplication and filter unit 6
Other signal makees process of frequency multiplication to above-mentioned 1., 2., 3. and 4., makees the process of frequency multiplication of (p-1) times to 1. and 3. signal, and p is positive integer,
To 2. and 4. signal makees p times of process of frequency multiplication, four electricity frequencys multiplication and filter unit 6 obtain the signal after four frequencys multiplication, respectively
For 1. × (p-1), 2. × p, 3. × (p-1) and 4. × p；7 are mixed using two one-levels, to the signal after frequency multiplication and non-frequency multiplication
Signal makees first order Frequency mixing processing, obtains the signal after four first order mixing, is respectively：1. -2.=(n-m) △ fr1、②×
P- 1. × (p-1)=2fa+△f01+(pgm-pgn+n)△fr1+2△fa, 3. -4.=(n-m) △ fr2、④×p-③×(p-1)
=2fb+△f02+(pgm-pgn+n)△fr2+2△fb；The signal being mixed using two level after 8 pairs of first order mixing is mixed as the second level
Frequency is handled, and is obtained the signal after two second level mixing, is respectively：(1. -2.) -3. -4.)=(n-m) △ fr、[②×p-①
× (p-1)]-(f of [4. × p- is 3. × (p-1)]=2a-fb)+△f0+(pgm-pgn+n)△fr+2△(fa-fb)；△f0+q△fr,
Above-mentioned two signal is substantially respectively equal to (n-m) △ fr, △ f0+q△fr, wherein n, m and q is positive integer, △ frIt is super for two
The relative repetition rate shake of short-pulse laser 1, △ f0Relative carrier envelope phase for two ultrashort pulse lasers 1 is trembled
It is dynamic, thermal compensation signal of the two signal cans directly as adaptive double light comb spectrum.Wherein, Michelson's interferometer 2 wraps
Include beam splitting chip or fiber coupler, first faraday's speculum, second faraday's speculum, delay crystal or time delay optical fiber and
Acousto-optic modulator with driving.The output light of the pulse laser 1 passes through beam splitting chip or fiber coupler, by 1:1 power
Into two-beam, light beam is directly over first faraday's speculum and reflects back into beam splitting chip or fiber coupler, another beam for score
Light first passes through delay crystal or time delay optical fiber, is reflected through the acousto-optic modulator with driving and second faraday's speculum, then according to
It is secondary to pass through the acousto-optic modulator with driving and delay crystal or time delay optical fiber, beam splitting chip or fiber coupler are returned to, two beams are anti-
Penetrate light and synthesized on beam splitting chip or fiber coupler and a branch of exported from Michelson's interferometer 2.
The present invention is made with adaptive double light comb spectrally compensating signal extraction systems of space structure and optical fiber structure below
Further illustrate.
Embodiment 1
Refering to accompanying drawing 2, the present invention is by two pulse lasers 11,12, two Michelson's interferometers 21,22, two light
Learn beam splitter 31,32, four optical filters 41,42,43,44, four photodetectors 51,52,53,54, four electricity times
At frequency and filter unit 61,62,63,64, two one-level frequency mixers 71,72, two level frequency mixers 8 and double light comb spectroscopic datas
Manage the extraction system that unit 9 forms adaptive double light comb spectrally compensating signals of space structure.
The output light of the ultrashort pulse laser 11 incides Michelson's interferometer 21, wherein, Michelson interference
Instrument 21 is by beam splitting chip 211, first faraday's speculum 212, second faraday's speculum 215, delay crystal 213 and with driving
Acousto-optic modulator 214 forms, modulating frequency fa.The output light of ultrashort pulse laser 11 presses 1 by beam splitting chip 211:1 work(
Rate score is into two-beam, and light beam is directly over first faraday's speculum 212 and reflects back into beam splitting chip 211, and another light beam is first
By delay crystal 213 and the acousto-optic modulator 214 with driving, finally reflected by second faraday's speculum 213, then successively
Beam splitting chip 211 is returned to after the acousto-optic modulator 214 with driving and delay crystal 213, two beam reflected lights are on beam splitting chip 211
Synthesize and a branch of exported from Michelson's interferometer 21.
The output light of another ultrashort pulse laser 12 incides another Michelson's interferometer 22, wherein, it is another
Michelson's interferometer 22 is by beam splitting chip 221, first faraday's speculum 222, second faraday's speculum 225, delay crystal
223 and the acousto-optic modulator 224 with driving form, modulating frequency fa.The output light of another ultrashort pulse laser 12 is passed through
Beam splitting chip 221 presses 1:1 power ratio is divided into two-beam, and light beam is directly over first faraday's speculum 222 and reflected back into point
Beam piece 221, another light beam first passes through delay crystal 223 and the acousto-optic modulator 224 with driving, finally anti-by the second faraday
Mirror 225 is penetrated to reflect, then successively by with driving acousto-optic modulator 224 and delay crystal 223 after return to beam splitting chip 221, two beams
Reflected light synthesizes on beam splitting chip 221 a branch of to be exported from another Michelson's interferometer 22.
The output light of the Michelson's interferometer 21 is respectively coupled to the He of optical filter 41 by optical beam-splitter 31
Another optical filter 43, filtered optical signalling is measured respectively using two photodetectors 51,53, the signal detected
It is designated as respectively 1., 2., 1. signal can be expressed as 2fa+△(nfr1+f01+2fa), n is positive integer, and its centre frequency is in 2fa, letter
Number drift include the repetition rate drift △ f of ultrashort pulse laser 11r1, carrier envelope phase drift △ f01Adjusted with acousto-optic
The drift △ f of device driving frequency processeda, 2. signal can be expressed as 2fa+△(mfr1+f01+2fa), m is positive integer, its center frequency
Rate includes repetition rate drift, carrier envelope phase drift and the acousto-optic tune of ultrashort pulse laser 11 in 2fa, the drift of signal
The drift of device driving frequency processed.
The output light of another Michelson's interferometer 22 is respectively coupled to optical filter by optical beam-splitter 32
42 and another optical filter 44, filtered optical signalling is measured respectively using two photodetectors 52,54, is detected
3., 4. signal is designated as respectively, 3. signal can be expressed as 2fb+△(nfr2+f02+2fb), n is positive integer, and its centre frequency exists
2fb, the drift of signal include the repetition rate drift △ f of ultrashort pulse laser 21r2, carrier envelope phase drift △ f02With
The drift △ f of acousto-optic modulator driving frequencyb, 4. signal can be expressed as 2fb+△(mfr2+f02+2fb), m is positive integer, its
Centre frequency is floatd in 2fb, repetition rate drift of the drift including another ultrashort pulse laser 12 of signal, carrier envelope phase
Move the drift with acousto-optic modulator driving frequency.
1., 2., the 3. and 4. signal that aforementioned four photodetector 51,52,53,54 is detected is by each signal averaging
Be divided into two-way, all the way not frequency multiplication, all the way using four electricity frequencys multiplication and filter unit 61,62,63,64 respectively to it is above-mentioned 1., 2.,
3. 4. signal makees process of frequency multiplication, 1. and 3. make the process of frequency multiplication of (p-1) again to signal, p is positive integer, 2. and 4. signal is made
P times of process of frequency multiplication, the signal after four frequencys multiplication is obtained, respectively 1. × (p-1), 2. × p, 3. × (p-1), 4. × p；Using
The signal of signal and non-frequency multiplication after two one-level frequency mixers, 71,72 pairs of frequencys multiplication makees first order Frequency mixing processing, obtains four first
Signal after level mixing, it is respectively：1. -2.=(n-m) △ fr1, 2. × p- 1. × (p-1)=2fa+△f01+(pgm-pgn+n)
△fr1+2△fa, 3. -4.=(n-m) △ fr2, 4. × p- 3. × (p-1)=2fb+△f02+(pgm-pgn+n)△fr2+2△fb；
Using a two level frequency mixer 8, the signal after being mixed to the first order makees second level Frequency mixing processing, after obtaining two second level mixing
Signal, be respectively：(1. -2.)-(3. -4.)=(n-m) △ fr、[②×p-①×(p-1)]-[④×p-③×(p-1)]
=2 (fa-fb)+△f0+(pgm-pgn+n)△fr+2△(fa-fb)；△f0+q△fr, above-mentioned two signal is substantially respectively equal to
(n-m)△fr, △ f0+q△fr, wherein n, m, q is positive integer, △ frRepeated for two the relative of ultrashort pulse laser 11,12
Frequency jitter, △ f0For the relative carrier envelope phase shake of two ultrashort pulse lasers 11,12, the two signal cans
Directly as the double light comb spectroscopic data processing units 9 of thermal compensation signal access of adaptive double light comb spectrum.
Embodiment 2
Refering to accompanying drawing 3, the present invention is by two pulse lasers 11,12, two Michelson's interferometers 21,22, two light
Learn beam splitter 31,32, four optical filters 41,42,43,45, four photodetectors 51,52,53,54, four electricity times
Frequency and filter unit 61,62,63,64, two one-level frequency mixers 71,72 and a two level frequency mixer 8 and double light comb spectroscopic datas
Processing unit 9 forms the extraction system of adaptive double light comb spectrally compensating signals of optical fiber structure.
The output light of the ultrashort pulse laser 11 incides Michelson's interferometer 21, wherein, Michelson interference
Instrument is by fiber coupler 211, first faraday's speculum 212, second faraday's speculum 215, time delay optical fiber 213 and with driving
Acousto-optic modulator 214 form, modulating frequency fa.The output light of pulse laser 11 presses 1 by fiber coupler 211:1
Power ratio is divided into two-beam, and light beam is directly over first faraday's speculum 212 and reflects back into fiber coupler 211, another
Shu Guang first passes through time delay optical fiber 213, then by the acousto-optic modulator 214 with driving, finally by second faraday's speculum 215
Reflection, then return to fiber coupler 211, two beam reflected lights by the acousto-optic modulator 214 with driving and time delay optical fiber 213 successively
Synthesize and a branch of exported from Michelson's interferometer 21 on fiber coupler 211.
The output light of the Michelson's interferometer 21 is respectively coupled to the He of optical filter 41 by optical beam-splitter 31
Optical filter 43, filtered optical signalling is measured respectively using two photodetectors 51,53, the signal difference detected
It is designated as 1., 2., 1. signal can be expressed as 2fa+△(nfr1+f01+2fa), n is positive integer, its centre frequency in 2fa, signal
Drift includes the repetition rate drift △ f of ultrashort pulse laser 11r1, carrier envelope phase drift △ f01And acousto-optic modulator
The drift △ f of driving frequencya, 2. signal can be expressed as 2fa+△(mfr1+f01+2fa), m is positive integer, and its centre frequency exists
2fa, the drift of signal include repetition rate drift, carrier envelope phase drift and the acousto-optic modulator of ultrashort pulse laser 11
The drift of driving frequency.
The output light of another ultrashort pulse laser 12 incides Michelson's interferometer 22, wherein, Michelson
Interferometer 22 is by fiber coupler 221, first faraday's speculum 222, second faraday's speculum 225, the and of time delay optical fiber 223
Acousto-optic modulator 224 with driving forms, modulating frequency fb.The output light of another ultrashort pulse laser 12 passes through optical fiber coupling
Clutch 221 presses 1:1 power ratio is divided into two-beam, and light beam is directly over first faraday's speculum 222 and reflects back into optical fiber
Coupler 221, another light beam first pass through time delay optical fiber 223, then by the acousto-optic modulator 224 with driving, finally by second
Faraday's speculum 225 reflects, then returns to fiber coupling by the acousto-optic modulator 224 with driving and time delay optical fiber 223 successively
Device 221, two beam reflected lights synthesize on fiber coupler 221 a branch of to be exported from Michelson's interferometer 22.
The output light of another Michelson's interferometer 22 is respectively coupled to optical filter by optical beam-splitter 32
42 and another optical filter 44, filtered optical signalling is measured respectively using two photodetectors 52,54, is detected
3., 4. signal is designated as respectively, 3. signal can be expressed as 2fb+△(nfr2+f02+2fb), n is positive integer, and its centre frequency exists
2fb, the drift of signal include the repetition rate drift △ f of ultrashort pulse laser 12r2, carrier envelope phase drift △ f02With
The drift △ f of acousto-optic modulator driving frequencyb, 4. signal can be expressed as 2fb+△(mfr2+f02+2fb), m is positive integer, its
Centre frequency in 2fb, the drift of signal include the repetition rate drift of ultrashort pulse laser 12, carrier envelope phase drift and
The drift of acousto-optic modulator driving frequency.
1., 2., the 3. and 4. signal that aforementioned four photodetector 51,52,53,54 is detected is by each signal averaging
Be divided into two-way, all the way not frequency multiplication, all the way using four electricity frequencys multiplication and filter unit 61,2,63,64 respectively to it is above-mentioned 1., 2.,
3. 4. signal makees process of frequency multiplication, 1. and 3. make the process of frequency multiplication of (p-1) again to signal, p is positive integer, 2. and 4. signal is made
P times of process of frequency multiplication, the signal after four frequencys multiplication is obtained, respectively 1. × (p-1), 2. × p, 3. × (p-1), 4. × p；Using
The signal of signal and non-frequency multiplication after two one-level frequency mixers, 71,72 pairs of frequencys multiplication makees first order Frequency mixing processing, obtains four first
Signal after level mixing, it is respectively：1. -2.=(n-m) △ fr1, 2. × p- 1. × (p-1)=2fa+△f01+(pgm-pgn+n)
△fr1+2△fa, 3. -4.=(n-m) △ fr2, 4. × p- 3. × (p-1)=2fb+△f02+(pgm-pgn+n)△fr2+2△fb；
Signal after being mixed using a two level frequency mixer 8 to the first order makees second level Frequency mixing processing, after obtaining two second level mixing
Signal, be respectively：(1. -2.)-(3. -4.)=(n-m) △ fr、[②×p-①×(p-1)]-[④×p-③×(p-1)]
=2 (fa-fb)+△f0+(pgm-pgn+n)△fr+2△(fa-fb)；△f0+q△fr, above-mentioned two signal is substantially respectively equal to
(n-m)△fr, △ f0+q△fr, wherein n, m, q is positive integer, △ frRepeated for two the relative of ultrashort pulse laser 11,21
Frequency jitter, △ f0For the relative carrier envelope phase shake of two ultrashort pulse lasers 11,21, the two signal cans
Directly as the double light comb spectroscopic data processing units 9 of thermal compensation signal access of adaptive double light comb spectrum.
Embodiment 3
Refering to accompanying drawing 4, the present invention is by two pulse lasers 11,12, sample cell 10, interference signal detecting module 14, two
Individual Michelson's interferometer 21,22, two optical beam-splitters 31,32, four optical filters 41,42,43,44, four photoelectricity
Detector 51,52,53,54, four electricity frequencys multiplication and filter unit 61,62,63,64, two one-level frequency mixers 71,72, one
Two level frequency mixer 8, adaptive double light comb spectroscopic system data processing units 9 and results of spectral measurements output module 13 form.
The output of the ultrashort pulse laser 11 is divided into two-way, is directly incident on sample cell 10 all the way, and another way is incident
To Michelson's interferometer 21, wherein, Michelson's interferometer is by beam splitting chip 211, first faraday's speculum 212, the second method
Speculum 215, delay crystal 213 and the acousto-optic modulator 214 with driving is drawn to form, modulating frequency fa.Ultrashort pulse swashs
The output light of light device 11 presses 1 by beam splitting chip 211:1 power ratio is divided into two-beam, and it is anti-that light beam is directly over the first faraday
To penetrate mirror 212 and reflect back into beam splitting chip 211, another light beam first passes through delay crystal 213, then by the acousto-optic modulator with driving
214, finally reflected by second faraday's speculum 215, then successively by the acousto-optic modulator 214 with driving and delay crystal
213 return to beam splitting chip 211, and two beam reflected lights synthesize a branch of on beam splitting chip 211, are exported from Michelson's interferometer 21.
The output light of another ultrashort pulse laser 12 incides another Michelson's interferometer 22, wherein, it is another
Michelson's interferometer 22 is by beam splitting chip 221, first faraday's speculum 222, second faraday's speculum 225, delay crystal
223 and the acousto-optic modulator 224 with driving form, modulating frequency fb.The output light of another ultrashort pulse laser 21 is passed through
Beam splitting chip 221 presses 1:1 power ratio is divided into two-beam, and light beam is directly over first faraday's speculum 222 and reflected back into point
Beam piece 221, another light beam first pass through delay crystal 223, then by the acousto-optic modulator 224 with driving, finally by the second method
Draw speculum 225 to reflect, then return to beam splitting chip 221 by the acousto-optic modulator 224 with driving and delay crystal 223 successively,
Two beam reflected lights synthesize on beam splitting chip 221 a branch of to be exported from another Michelson's interferometer 22.
The output light of the Michelson's interferometer 21 is respectively coupled to the He of optical filter 41 by optical beam-splitter 31
Another optical filter 43, filtered optical signalling is measured respectively using two photodetectors 51,53, the signal detected
It is designated as respectively 1., 2., 1. signal can be expressed as 2fa+△(nfr1+f01+2fa), n is positive integer, and its centre frequency is in 2fa, letter
Number drift include the repetition rate drift △ f of ultrashort pulse laser 11r1, carrier envelope phase drift △ f01Adjusted with acousto-optic
The drift △ f of device driving frequency processeda, 2. signal can be expressed as 2fa+△(mfr1+f01+2fa), m is positive integer, its center frequency
Rate includes repetition rate drift, carrier envelope phase drift and the acousto-optic tune of ultrashort pulse laser 11 in 2fa, the drift of signal
The drift of device driving frequency processed.
The output light of another Michelson's interferometer 22 is respectively coupled to optical filter by optical beam-splitter 32
42 and another optical filter 44, filtered optical signalling is measured respectively using two photodetectors 52,54, is detected
3., 4. signal is designated as respectively, 3. signal can be expressed as 2fb+△(nfr2+f02+2fb), n is positive integer, and its centre frequency exists
2fb, the drift of signal include the repetition rate drift △ f of ultrashort pulse laser 21r2, carrier envelope phase drift △ f02With
The drift △ f of acousto-optic modulator driving frequencyb, 4. signal can be expressed as 2fb+△(mfr2+f02+2fb), m is positive integer, its
Centre frequency is floatd in 2fb, repetition rate drift of the drift including another ultrashort pulse laser 12 of signal, carrier envelope phase
Move the drift with acousto-optic modulator driving frequency.
1., 2., the 3. and 4. signal that aforementioned four photodetector 51,52,53,54 is detected is by each signal averaging
Be divided into two-way, all the way not frequency multiplication, all the way using four electricity frequencys multiplication and filter unit 61,2,63,64 respectively to it is above-mentioned 1., 2.,
3. 4. signal makees process of frequency multiplication, 1. and 3. make the process of frequency multiplication of (p-1) again to signal, p is positive integer, 2. and 4. signal is made
P times of process of frequency multiplication, the signal after four frequencys multiplication is obtained, respectively 1. × (p-1), 2. × p, 3. × (p-1), 4. × p；Using
The signal of signal and non-frequency multiplication after two one-level frequency mixers, 71,72 pairs of frequencys multiplication makees first order Frequency mixing processing, obtains four first
Signal after level mixing, it is respectively：1. -2.=(n-m) △ fr1, 2. × p- 1. × (p-1)=2fa+△f01+(pgm-pgn+n)
△fr1+2△fa, 3. -4.=(n-m) △ fr2, 4. × p- 3. × (p-1)=2fb+△f02+(pgm-pgn+n)△fr2+2△fb；
Signal after being mixed using two level frequency mixer 8 to the first order makees second level Frequency mixing processing, obtains the letter after two second level mixing
Number, it is respectively：(1. -2.)-(3. -4.)=(n-m) △ fr, [2. × p- is 1. × (p-1)]-[4. × p- is 3. × (p-1)]=2
(fa-fb)+△f0+(pgm-pgn+n)△fr+2△(fa-fb)；△f0+q△fr, above-mentioned two signal is substantially respectively equal to (n-
m)△fr, △ f0+q△fr, wherein n, m, q is positive integer, △ frFor the relatively heavy multifrequency of two ultrashort pulse lasers 11,12
Rate is shaken, △ f0It is straight for the relative carrier envelope phase shake of two ultrashort pulse lasers 11,12, the two signal cans
Connect the double light comb spectroscopic data processing units 9 of thermal compensation signal access as adaptive double light comb spectrum.
The present invention is so to carry out spectral measurement to sample：By ultrashort pulse laser 11 and another ultra-short pulse laser
The two-beam of device 12, which incides, irradiates testing sample in sample cell 10, then two beam incident lights are combined into a branch of interference signal that incides and visited
Module 14 is surveyed, interference signal detecting module 14 measures the interference signal of two ultrashort pulse lasers 11,12, by the interference signal
Adaptive double light comb spectroscopic system data processing units 9 are input to, adaptive double light comb spectroscopic system data processing units 9 have three
Individual input signal, three input signals are characterized as compensation of two pulse lasers 11,12 with respect to repetition rate shake respectively
Signal, the thermal compensation signal of relative carrier envelope phase shake and the interference signal after sample cell 10, adaptive double light comb light
Spectra system data processing unit 9 is by using the thermal compensation signal for characterizing the relative repetition rate shake of two pulse lasers 11,12
As asynchronous clock sampled signal, believed using compensation of two pulse lasers 11,12 with respect to carrier envelope phase shake is characterized
Number with two pulse lasers 11,12 after sample cell 10 interference signal mixing method, respectively eliminate two pulses swash
Light device 11,12 shakes the influence to spectral measurement with respect to repetition rate and relative carrier envelope phase, obtains high-precision spectrum
Measurement result, measurement data is exported finally by results of spectral measurements output module 13.
Simply the present invention is further illustrated above, and is not used to limit practicing for this patent, and all is this hair
Bright equivalence enforcement, is intended to be limited solely by within the right of this patent.
Claims (4)
1. a kind of adaptive double light comb spectrally compensating method for extracting signal, including ultrashort pulse laser, photodetector, electricity
Frequency multiplication and filter unit and double light comb spectroscopic data processing units, it is characterised in that using two independent Michelson's interferometers
The frequency jitter of two ultrashort pulse lasers is measured respectively, and the output light of two Michelson's interferometers is then respectively enterd two
Output light is respectively coupled to four optical filters, filtered four optical signals point by optical beam-splitter, two optical beam-splitters
Do not detected by four photodetectors, the optical signal of detection is equally divided into two-way and exported by each photodetector, all the way
Output light respectively enters one-level mixing and two level mixing successively after electricity frequency multiplication and filter unit with another way output light, then
Using the optical signal after two level Frequency mixing processing as the double light comb spectroscopic data processing of the thermal compensation signal access of adaptive double light comb spectrum
Unit；The optical signal detected is equally divided into two-way output and visited respectively for four photodetectors by each photodetector
1., 2., 3. and 4. four optical signals are measured, each optical signal is equally divided into two-way output, and two photodetectors export all the way
1. and 2. two optical signals enter one-level after two electricity frequencys multiplication and filter unit respectively and be mixed, two photodetectors are another
1. and 2. two optical signals of road output are directly entered one-level mixing respectively；Another two photodetector export all the way 3. and 4. two
Individual optical signal enters another one-level respectively after another two electricity frequency multiplication and filter unit and is mixed, and another two photodetector is another
3. and 4. two optical signals of road output are directly entered the mixing of another one-level respectively；Four electricity frequencys multiplication and filter unit
In two electricity frequencys multiplication and filter unit make the process of frequency multiplication of (p-1) times, another two electricity times to 1. and 3. optical signal respectively
Frequency and filter unit respectively obtain 1. × (p-1), 2. × p, 3. × (p- respectively to 2. and 4. optical signal makees p times of process of frequency multiplication
1) and the signal after 4. × frequencys multiplication of p tetra-, by 1. × (p-1), the 2. × p after frequency multiplication and non-frequency multiplication 1. and 2. optical signal entrance
One-level is mixed, one-level mixing will 1. × (p-1) with 1., 2. × p with after optical signal mixing 2., respectively obtain 1. -2. and 2. ×
P- 1. × (p-1) two mixing optical signal；By 3. × (p-1), the 4. × p after frequency multiplication and non-frequency multiplication 3., 4. optical signal enters
Enter the mixing of another one-level, the mixing of another one-level will 3. × (p-1) with 3., 4. × p with after optical signal mixing 4., respectively
To 3. -4. and 4. × p- 3. × (p-1) two mixing optical signal, then will 1. -2., 2. × p- 1. × (p-1) two mixing
Optical signal and 3. -4. and 4. × p- 3. × (p-1) two mixing optical signal respectively enter two level mixing, at two level mixing
(1. -2.)-(3. -4.) is respectively obtained after reason and two conducts of [2. × p- is 1. × (p-1)]-[4. × p- is 3. × (p-1)] are adaptive
Answer the double light comb spectroscopic data processing units of thermal compensation signal access of double light comb spectrum；The benefit of described two adaptive double light comb spectrum
It is respectively (n-m) △ f to repay signalrWith △ f0+q△fr, wherein：△frFor the relative repetition rate of two ultrashort pulse lasers
Shake；△f0For the relative carrier envelope phase shake of two ultrashort pulse lasers；P, n and m is positive integer.
2. adaptive double light comb spectrally compensating method for extracting signal according to claim 1, it is characterised in that the Michael
Inferior interferometer includes beam splitting chip or fiber coupler, two faraday's speculums, delay crystal or time delay optical fiber and with driving
Acousto-optic modulator, it is 1 that the output light of ultrashort pulse laser presses power ratio by beam splitting chip or fiber coupler:1 is divided into two beams
Light, light beam are directly over the reflection of first faraday's speculum, return to beam splitting chip or fiber coupler, another light beam, which first passes through, to be prolonged
Shi Jingti or time delay optical fiber, then by the acousto-optic modulator with driving, finally reflect by second faraday's speculum, pass through successively
Acousto-optic modulator with driving and delay crystal or time delay optical fiber return to beam splitting chip or fiber coupler, and two beam reflected lights are in beam splitting
Synthesized on piece or fiber coupler a branch of from Michelson's interferometer output.
3. adaptive double light comb spectrally compensating method for extracting signal according to claim 1, it is characterised in that the optics point
Beam device is 1:The semi-transparent semi-reflecting eyeglass or fiber coupler of 1 splitting ratio.
4. adaptive double light comb spectrally compensating method for extracting signal according to claim 1, it is characterised in that the optics filter
Ripple device is the laser for allowing specific wavelength by completely cutting off narrow-band filtering eyeglass, fiber grating or light that other wavelength lasers pass through
Fiber filter.
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