CN109357763A - A kind of atmospheric absorption spectroscopy measuring system and method based on time resolution frequency comb - Google Patents
A kind of atmospheric absorption spectroscopy measuring system and method based on time resolution frequency comb Download PDFInfo
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- CN109357763A CN109357763A CN201811127443.1A CN201811127443A CN109357763A CN 109357763 A CN109357763 A CN 109357763A CN 201811127443 A CN201811127443 A CN 201811127443A CN 109357763 A CN109357763 A CN 109357763A
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- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000004847 absorption spectroscopy Methods 0.000 title claims abstract description 14
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- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 14
- 230000003287 optical effect Effects 0.000 claims abstract description 14
- 238000006073 displacement reaction Methods 0.000 claims abstract description 11
- 230000009466 transformation Effects 0.000 claims abstract description 10
- 238000001514 detection method Methods 0.000 claims abstract description 8
- 238000001228 spectrum Methods 0.000 claims abstract description 5
- 230000010287 polarization Effects 0.000 claims description 44
- 239000013307 optical fiber Substances 0.000 claims description 39
- 230000006641 stabilisation Effects 0.000 claims description 10
- 238000011105 stabilization Methods 0.000 claims description 10
- 239000013078 crystal Substances 0.000 claims description 9
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- 230000005622 photoelectricity Effects 0.000 claims 2
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- 238000000862 absorption spectrum Methods 0.000 abstract description 8
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- 230000001105 regulatory effect Effects 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 7
- 238000005259 measurement Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 3
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 2
- 210000001367 artery Anatomy 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 210000003462 vein Anatomy 0.000 description 2
- 229910052691 Erbium Inorganic materials 0.000 description 1
- 230000035559 beat frequency Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
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- UYAHIZSMUZPPFV-UHFFFAOYSA-N erbium Chemical compound [Er] UYAHIZSMUZPPFV-UHFFFAOYSA-N 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- GQYHUHYESMUTHG-UHFFFAOYSA-N lithium niobate Chemical compound [Li+].[O-][Nb](=O)=O GQYHUHYESMUTHG-UHFFFAOYSA-N 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/28—Investigating the spectrum
- G01J3/2803—Investigating the spectrum using photoelectric array detector
Abstract
The invention discloses a kind of atmospheric absorption spectroscopy measuring system and method based on time resolution frequency comb, the variable frequency comb that system generation time first is differentiated finally is applied to gas absorption spectra and measures then through laser power amplification and nonlinear transformation.For the frequency comb specifically differentiated first by frequency displacement circuit and fibre delay line generation time as detection light, the frequency comb of output is the inclined pulsed light of line, is converted convenient for power amplification and frequency non-linear；It can direct detection precision gaseous spectrum in the time domain the invention enables frequency comb, and the regulating system parameter that can be convenient, it is measured applied to different atmospheric optical specs, the parameters such as concentration, temperature and pressure on corresponding gas path of integration then can also be obtained by inverting.
Description
Technical field
The present invention relates to the generation technologies of atmospheric optical spec measuring technique and frequency comb, in particular to a kind of to be based on time resolution
The atmospheric absorption spectroscopy measuring system and method for frequency comb.
Background technique
Frequency comb can produce the equally spaced laser output of frequency, and the characteristic of high spectral resolution makes it in detection of gas
Field has important application.However existing frequency comb is all to run under mode locking or the condition of continuity, and comb teeth is all
It generates simultaneously, this makes comb teeth undistinguishable in the time domain.In order to differentiate comb teeth, a kind of method be introduce in the receiver it is high
Spend the element or fine wave length tuning device of dispersion, such as virtual image phased array, scanning F-P cavity and high-resolution interference
Instrument realizes the resolution of comb teeth in spectral Dimensions；Another scheme is then to be led to using two relevant optical frequency tree structures at " double comb spectrum "
The beat signal of analysis detection light and reference light is crossed, then obtains the light of measured signal indirectly by the microwave signal of research beat frequency
Spectrum.Although these schemes solve the resolution problems of comb teeth to a certain extent, the complexity and energy of system are increased
Loss, can not intuitively obtain result.It and is then by tunable continuous sharp based on the frequency comb that optic frequency shift circuit generates
Light device generates the different comb teeth of energy as seed laser, by frequency displacement circuit, then filters to obtain relatively by optical filter
Flat frequency comb, although solving the above problem to a certain extent, its spectral resolution can be applicable in 100GHz
In the spectrum analysis of liquid and solid, but the line-width of most of gas molecule in space is in several GHz ranges, therefore it is not applicable
In high-precision gas spectroscopy；In addition, all comb teeth are continuous output to this frequency comb in time, the time cannot achieve
It differentiates.
Summary of the invention
In order to overcome the above-mentioned deficiencies of the prior art, the present invention provides a kind of big aspirations based on time resolution frequency comb
Receive spectral measurement system and method, the generation simultaneously that solves existing frequency comb comb teeth directly and be unable to time resolution, spectrally resolved
The frequency comb for generating different parameters can be arranged in the problem of rate is not high and result needs complicated calculations by simple system, then
By Laser-Nonlinear convert adjust its frequency domain, thus by frequency comb be applied to atmospheric optical spec measurement, and can when
Gas absorption spectrum is directly displayed on domain.
Present system is as shown in Figure 1, include frequency stabilization distributed feedback laser diode 1, intensity modulator 2,3dB polarization-maintaining
Fiber coupler 3, polarization-maintaining circulator 4, fibre delay line 5, faraday rotation mirror 6, er-doped polarization maintaining optical fibre amplifier 7, intensive wave
Divide multiplex filter 8, polarization-maintaining frequency shifter 9,20dB polarization-maintaining fiber coupler 10, photodetector 11, frequency shifter drive control system
System 12, er-doped polarization maintaining optical fibre amplifier 13, nonlinear transformation crystal 14, dichroscope 15, baffle 16, wedge-shaped sampler 17, hair
Penetrate telescope 19, receiving telescope 22, photodetector 23, computer 24；Wherein frequency stabilization distributed feedback laser diode 1 is made
For seed laser, recurrent pulses are modulated into intensity modulator 2 by polarization maintaining optical fibre coupling output, are transmitted to through polarization maintaining optical fibre
3dB polarization-maintaining fiber coupler 3, hence into frequency displacement circuit；In frequency displacement circuit, laser from 3dB polarization-maintaining fiber coupler 3 export to
Polarization-maintaining circulator 4 reinjects the variable fibre delay line 5 of length, and end connects 6 reflection laser of faraday rotation mirror, later,
Polarization-maintaining circulator 4 is returned to through fibre delay line 5 again, injects the erbium-doped fiber amplifier 7 of connection orthogonal with polarization-maintaining circulator 4 to protect
Partially, then veiling glare is filtered out through close wave-division multiplexer filter 8 and pulse is imported into polarization-maintaining frequency shifter 9 later, couple with 3dB polarization maintaining optical fibre
The connection of device 3 forms complete loops, exports frequency comb after repeatedly being recycled；Frequency comb output is exported extremely by polarization maintaining optical fibre coupling
20dB polarization-maintaining fiber coupler 10, the output light for separating 1% are used as feedback signal by the acquisition of photodetector 11, adjust frequency shifter
The driving of driving control system 12, to export flat frequency comb；The main output coupling of 20dB polarization-maintaining fiber coupler 10 is extremely
Er-doped polarization maintaining optical fibre laser amplifier 13, output focuses in nonlinear crystal 14 to free space, passes through two after laser amplifier
Fundamental frequency light is filtered off after to Look mirror 15, is blocked by baffle 16, is inserted into wedge-shaped sampler 17 to sample to 1% second harmonic
It being referred to for pulse energy, main energetic is used as detection light after transmitter-telescope 19 and distant place atmosphere 20 to be measured act on,
It is reflected by hard goal 21, reflection signal is collected by receiving telescope 22, then acquired by photodetector 23, adopted by computer 24
Gas absorption spectrum is drawn after collection comparison detection signal and reference signal.
In the frequency displacement circuit, fibre delay line (5) fiber lengths should be between 0.1km-10km；
The continuously distributed feedback laser diode 1 of frequency stabilization exports continuous light and is coupled by polarization maintaining optical fibre and exported；
In the system, intensity modulator 2 can be acousto-optic modulator, electrooptic modulator and mechanical switch modulator.
A kind of the step of atmospheric absorption spectroscopy measuring system and method based on time resolution frequency comb, is as follows:
1, the generation of time resolution frequency comb
Frequency stabilization distributed feedback laser diode 1 is used as seed laser, is coupled and is exported to intensity tune by polarization maintaining optical fibre
Seed laser is modulated into recurrent pulses output, is then injected into 3dB polarization-maintaining fiber coupler 3, pulse energy by device 2 processed
For the half of amount as initial comb teeth, the other half enters optic frequency shift circuit；In circuit, first laser is coupled again by polarization maintaining optical fibre
Polarization-maintaining circulator 4 is injected, subsequently into the fibre delay line 5 that length can be changed, so that pulse generates delay in time, it is thus real
Existing time resolution, then reflected through faraday rotation mirror 6, it polarizes and degenerates caused by compensating in fibre delay line 5, but laser arteries and veins
Refunds is to fibre delay line 5, then will form after polarization-maintaining circulator 4 90 ° of change of polarized direction, thus polarization-maintaining circulator 4 with
To maintain original polarization, laser reinjects close wave-division multiplexer filter 8 and filters out veiling glare the orthogonal connection of polarization maintaining optical fibre amplifier 7,
Then it is coupled and is exported to polarization-maintaining frequency shifter 9 by polarization maintaining optical fibre, so that its frequency is generated offset, eventually pass back to 3dB polarization maintaining optical fibre
Coupler 3, discharges half pulse energy, residual impulse the energy time delay through circuit, amplification, filtering and frequency displacement program again,
Frequency comb teeth repeatedly is formed after circulation, initial comb teeth is inserted into through 3dB polarization-maintaining fiber coupler 3, constitutes frequency comb；
2, frequency comb comb teeth height adjusts
After circuit produces the last one comb teeth, polarization-maintaining frequency shifter 9 is closed to stop the subsequent comb teeth being not required to, simultaneously
Intensity modulator 2 discharges another initial comb teeth to restart the frequency comb generating process of a new round；And due to each comb teeth
Gain and loss factor it is different, it is also different in a cycle to export pulse energy, so need to be by frequency comb again through polarization-maintaining
Fiber coupling is simultaneously exported to 20dB polarization-maintaining fiber coupler 10, regard a part of light as feedback signal by photodetector 11,
The Timing driver of polarization-maintaining frequency shifter 8 and the amplification function of polarization maintaining optical fibre amplifier 7 are adjusted by frequency shifter driving control system 12
Rate obtains flat frequency comb so that the pulse energy in each period is essentially identical, to carry out stable power amplification；
3, laser power amplification and nonlinear transformation
Power amplification will be carried out in the frequency comb injection polarization maintaining optical fibre amplifier 13 of output, output to free space, then
Nonlinear crystal 14 is focused to, frequency comb is converted into frequency range corresponding with required atmospheric sounding, then pass through dichroscope 15
Fundamental frequency light is filtered off, is blocked by baffle 16；
4, atmospheric absorption spectroscopy measures
Frequency comb by optical transform passes through wedge-shaped sampler 17 and reflects a part of light by the acquisition work of photodetector 18
For pulse energy reference signal, dump energy is emitted from transmitter-telescope 19 to atmosphere 20 to be measured, by the reflection of hard goal 21,
Reflection signal is collected by receiving telescope 22, then is acquired by photodetector 23, finally analyzes comparison reference by computer 24
Signal and detectable signal can directly obtain the gas absorption spectrum in time domain.
The present invention is based on time-resolved frequency combs to realize the accurate measurement to atmospheric optical spec in the time domain, and this method is logical
Crossing the increase fibre delay line in frequency displacement circuit realizes the time resolution of frequency comb, and principle is different comb teeth in frequency displacement circuit
Propagation time delay is formd by delay line, to separate in the time domain to comb teeth；By adjusting 2 He of intensity modulator
Polarization-maintaining frequency shifter 9 can also easily adjust comb teeth period and the comb teeth interval of frequency comb, i.e. covering bandwidth and spectral resolution；
Whole process is arranged using polarization-maintaining, the inclined pulse frequency comb of output line, it may be convenient to nonlinear transformation is carried out, to be applied to difference
The atmospheric optical spec of spectral coverage measures, and quickly obtains Atmospheric Absorption spectrum in the time domain, then pass through the available corresponding air volume of inverting
The parameters such as concentration, temperature and pressure on sub-path.
It, can be with the object of the present invention is to provide a kind of atmospheric optical spec measuring system and method based on time resolution frequency comb
Applied to different Atmospheric Absorption spectrometrys, which is had the beneficial effect that
1) time resolution of frequency comb comb teeth is realized；
2) resolution ratio of frequency comb is improved, and can realize the requirement of different resolution by different settings；
3) by the nonlinear transformation of laser, different atmospheric optical specs can be measured；
4) the direct time-domain measurement of the Atmospheric Absorption spectrum based on frequency comb is realized.
Detailed description of the invention
Fig. 1 is present system structural schematic diagram.
Specific embodiment
The embodiment embodiment that the present invention will be described in detail is measured with an oxygen A band spectrum with reference to the accompanying drawing.
Main devices employed in the present invention are described as follows:
1, seed laser 1: for FITEL company, the frequency stabilization distributed feedback of model FRL-15DCWD-A81-19600-C
Laser diode, central wavelength 1529.55nm, line width are less than 1MHz, couple output through 9 μm of polarization maintaining optical fibre by core.
2, polarization-maintaining fiber coupler 3,10: for RUIK company production, model be respectively PMFC-1529-25041100 and
PMFC-1529-10141100。
3, fibre delay line: polarization maintaining fiber ring device 4 produces, model PMCIR-1529-PB00- for RUIK company
010；Fibre delay line 5, length are the general single mode fiber (SMF28-e) of 2km；Faraday rotation mirror 6, the FRM- of RUIK company
1529, the polarization that can compensate ordinary optic fibre is degenerated, but 90 ° of polarization side can be introduced when laser returns to polarization-maintaining circulator 4
To change.
4, close wave-division multiplexer filter 8: for the production of RUIK company, model PMDWDM-60-21100 is used
The channel C60, channel width 100GHz.
5, nonlinear crystal 14: for lithium niobate (PPMgLN) frequency multiplication of the periodic polarized magnesia doping of multichannel of customization
Crystal, having a size of 15 (L) × 12 (W) × 1 (T) mm3。
6, atmospheric optical spec measures: photodetector 10,18 and 23 is the production of Thorlabs company, and model is respectively
DET08C/M and DET36A/M, detection wavelength correspond respectively to 800-1700nm and 350-1100nm；Dichroscope is selected
The DMSP950 of Thorlabs company, cutoff wavelength 950nm；The BSF2550 beam splitting of wedge-shaped sampler selection Throlabs company
Plate；
7, other devices are self-control device.Intensity modulator 2 and polarization-maintaining frequency shifter 9 use acousto-optic modulator, drive
12 main component of autocontrol system is arbitrary waveform generator (AWG7122C, Tektronix)；Erbium doped fiber laser amplifier 7
It is pumped with 13 by the single mode laser diode of 976nm, gain fibre (PM-ESF-7/125, Neufern) length is 50cm；Hair
The beam-expanding collimation mirror that telescope 19 is 5mm bore is penetrated, receiving telescope 22 is the telescope of 150mm bore.
The method of the present invention schematic diagram is as shown in Figure 1.Concrete condition is described as follows:
1, the generation of time-resolved frequency comb
Frequency stabilization distributed feedback laser diode 1 is used as seed laser, is coupled and is exported to intensity tune by polarization maintaining optical fibre
Seed laser is modulated into recurrent pulses output, 3dB polarization-maintaining fiber coupler 3 is then injected into, into frequency displacement by device 2 processed
In circuit, laser is first reinjected into polarization-maintaining circulator 4 by polarization maintaining optical fibre coupling, subsequently into fibre delay line 5, then through farad
Revolving mirror 6 reflects, and laser pulse returns to fibre delay line 5, then enters er-doped polarization maintaining optical fibre amplifier 7 through polarization-maintaining circulator 4,
For the connection orthogonal with er-doped polarization maintaining optical fibre amplifier 7 of polarization-maintaining circulator 4 to maintain original polarization, laser reinjects dense wave division multipurpose
Filter 8 filters out veiling glare, is then coupled and is exported to polarization-maintaining frequency shifter 9 by polarization maintaining optical fibre, so that its frequency is generated offset, finally
Return to 3dB polarization-maintaining fiber coupler 3, discharge half pulse energy, residual impulse energy again the time delay through circuit, amplification,
Filtering and frequency displacement program repeatedly form frequency comb teeth after circulation, are inserted into initial comb teeth through 3dB polarization-maintaining fiber coupler 3, constitute
Frequency comb；
2, frequency comb comb teeth height adjusts
Frequency comb is exported and is coupled into 20dB fiber coupler 10 through polarization maintaining optical fibre, 1% light is passed through into photodetector
11 are used as feedback signal, and the Timing driver and fiber amplifier of polarization-maintaining frequency shifter 8 are adjusted by frequency shifter driving control system 12
The amplifying power of device 7, so that the pulse energy in each period is essentially identical；
3, laser power amplification and nonlinear transformation
Frequency comb is coupled into er-doped polarization maintaining optical fibre amplifier 13 by polarization maintaining optical fibre and carries out power amplification, output is to certainly
It by space, is then focused into PPMgLN crystal 14, then fundamental frequency light is filtered off by dichroscope 15, obtain wavelength and be located at
Frequency multiplication frequency comb near 764.75nm, maximum average power 151mW, meanwhile, comb teeth spacing and total bandwidth are also through frequency multiplication mistake
Journey doubles, that is, has 80 comb teeth, covers bandwidth 32GHz, frequency interval 400MHz；；
4, atmospheric absorption spectroscopy measures.
Frequency comb by optical transform passes through wedge-shaped sampler 17 and reflects 1% light by the acquisition of photodetector 18 as arteries and veins
Energy reference signal is rushed, dump energy is emitted from transmitter-telescope 19 to atmosphere 20 to be measured, by the reflection of hard goal 21, by connecing
It receives telescope 22 and collects reflection signal, then acquired by photodetector 23, finally analyze comparison reference signal by computer 24
With detectable signal, the gas absorption spectrum in time domain can be directly obtained.
In conclusion the system can carry out high-precision measurement to oxygen A band absorption spectra.It is generated again because of the present invention
Frequency comb parameter is easily adjusted, and Laser-Nonlinear transformation is feasible, so it very easily can also be measured by different frequency domain settings
Its atmospheric optical spec.
Claims (5)
1. a kind of atmospheric absorption spectroscopy measuring system based on time resolution frequency comb, including two pole of frequency stabilization distributed feedback laser
Manage (1), intensity modulator (2), 3dB polarization-maintaining fiber coupler (3), polarization-maintaining circulator (4), fibre delay line (5), faraday's rotation
Tilting mirror (6), er-doped polarization maintaining optical fibre amplifier (7), close wave-division multiplexer filter (8), polarization-maintaining frequency shifter (9), 20dB polarization-maintaining light
It is fine coupler (10), photodetector (11), frequency shifter driving control system (12), er-doped polarization maintaining optical fibre amplifier (13), non-
Linear transformation crystal (14), baffle (16), wedge-shaped sampler (17), transmitter-telescope (19), is received and is looked in the distance dichroscope (15)
Mirror (22), photodetector (23), computer (24), it is characterised in that:
The seed laser that frequency stabilization distributed feedback laser diode (1) issues is coupled through polarization maintaining optical fibre and is exported to intensity modulator
(2) recurrent pulses are modulated into, then are transmitted to 3dB polarization-maintaining fiber coupler (3) through polarization maintaining optical fibre, into frequency displacement circuit；Frequency displacement
In circuit, laser is transmitted to polarization-maintaining circulator (4) through 3dB polarization-maintaining fiber coupler (3), then through fibre delay line (5), is transmitted to
The faraday rotation mirror (6) of end is reflected back to fibre delay line (5), injects orthogonal to that connection through polarization-maintaining circulator (4)
Er-doped polarization maintaining optical fibre amplifier (7), then through close wave-division multiplexer filter (8) filter off veiling glare after, pulse is imported into polarization-maintaining
Frequency shifter (9) eventually passes back to 3dB polarization-maintaining fiber coupler (3) and forms complete loops, frequency comb is exported after repeatedly recycling；Light
The output of frequency comb by polarization maintaining optical fibre coupling output to 20dB polarization-maintaining fiber coupler (10), visited by photoelectricity by the output light for separating 1%
Device (11) are surveyed to acquire as feedback signal transmission to frequency shifter driving control system (12), 20dB polarization-maintaining fiber coupler (10)
After main output injection er-doped polarization maintaining optical fibre amplifier (13), laser is exported to free space, nonlinear crystal is focused on
(14) it in, after filtering off fundamental frequency light by dichroscope (15), is blocked by baffle 16, is inserted into wedge-shaped sampler (17) to 1%
Second harmonic carry out sampling and referred to for pulse energy, main energetic transmission is as detection light by transmitting mirror (19) and remote
It after locating atmosphere to be measured (20) effect, is reflected by hard goal (21), collects reflection signal by receiving telescope (22), then visited by photoelectricity
Device (23) acquisition is surveyed, is finally shown on computer (24).
2. a kind of atmospheric absorption spectroscopy measuring system based on time resolution frequency comb according to claim 1, feature
Be: described fibre delay line (5) fiber lengths in frequency displacement circuit can be changed between 0.1km-10km.
3. a kind of atmospheric absorption spectroscopy measuring system based on time resolution frequency comb according to claim 1, feature
Be: the frequency stabilization distributed feedback laser diode (1) exports continuous light, and is coupled and exported by polarization maintaining optical fibre.
4. a kind of atmospheric absorption spectroscopy measuring system based on time resolution frequency comb according to claim 1, feature
Be: the intensity modulator (2) is acousto-optic modulator, electrooptic modulator or mechanical switch modulator.
5. a kind of based on a kind of the big of the atmospheric absorption spectroscopy measuring system based on time resolution frequency comb described in claim 1
Gas spectral measurement method, it is characterised in that method and step is as follows:
1) generation of time resolution frequency comb: frequency stabilization distributed feedback laser diode (1) passes through polarization-maintaining light as seed laser
Fibre is coupled and is exported to intensity modulator (2), and seed laser is modulated into recurrent pulses output, is then injected into 3dB guarantor
Inclined fiber coupler (3), for the half of pulse energy as initial comb teeth, the other half enters optic frequency shift circuit；In circuit, first
Laser is coupled into injection polarization-maintaining circulator (4) by polarization maintaining optical fibre, subsequently into the fibre delay line (5) that length can be changed, so that
Pulse generates delay in time, is achieved in time resolution, then reflect through faraday rotation mirror (6), compensates in optical fiber delay
It polarizes and degenerates caused by line (5), but laser pulse returns to fibre delay line (5), then will form after polarization-maintaining circulator (4)
90 ° of change of polarized direction, so polarization-maintaining circulator (4) connection orthogonal with er-doped polarization maintaining optical fibre amplifier (7) is to remain original
Polarization, later, laser reinjects close wave-division multiplexer filter (8) and filters out veiling glare, then couples and exports by polarization maintaining optical fibre
To polarization-maintaining frequency shifter (9), so that its frequency is generated offset, eventually pass back to 3dB polarization-maintaining fiber coupler (3), discharges half pulse energy
Amount, the time delay through circuit, amplification, filtering and frequency displacement program, multiple circulation form frequency comb to residual impulse energy later again
Tooth is inserted into initial comb teeth through 3dB polarization-maintaining fiber coupler (3), constitutes time-resolved frequency comb；
2) frequency comb comb teeth height adjusts: after circuit produces the last one comb teeth, closing polarization-maintaining frequency shifter (9) to stop
The subsequent comb teeth being not required to, while intensity modulator (2) discharges another initial comb teeth to restart the life of the frequency comb of a new round
At process；And the gain due to each comb teeth and loss factor difference, output pulse energy are also different in a cycle, institute
It couples and exports to 20dB polarization-maintaining fiber coupler (10) through polarization maintaining optical fibre again so that frequency comb need to be exported, a part of light is taken to pass through
Photodetector (11) is used as feedback signal, and the timing of polarization-maintaining frequency shifter (8) is adjusted by frequency shifter driving control system (12)
The amplifying power of driving and er-doped polarization maintaining optical fibre amplifier (7) obtains so that the pulse energy in each period is essentially identical
Flat frequency comb, to carry out stable power amplification；
3) laser power amplification and nonlinear transformation: the frequency comb of output is injected into polarization maintaining optical fibre amplifier (13), carries out power
Amplification, is then focused into nonlinear crystal (14), by frequency comb frequency transformation to frequency range corresponding with required atmospheric sounding, then
Fundamental frequency light is filtered off by dichroscope (15), is blocked by baffle (16)；
4) atmospheric absorption spectroscopy measures: the frequency comb by optical transform passes through wedge-shaped sampler (17) and reflects a part of light by light
Electric explorer (18) acquisition is used as pulse energy reference signal, and dump energy is emitted from transmitter-telescope (19) to atmosphere to be measured
(20), by the reflection of hard goal (21), reflection signal is collected by receiving telescope (22), then adopted by photodetector (23)
Collection, finally by computer (24) analysis comparison reference signal and detectable signal, the gas that can be directly obtained in time domain absorbs
Spectrum.
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| CN111551520A (en) * | 2020-05-24 | 2020-08-18 | 清华大学 | Method and device for gas concentration multiplexing detection of cascade absorption path |
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| CN112362173A (en) * | 2020-11-18 | 2021-02-12 | 中国航空工业集团公司北京长城计量测试技术研究所 | Laser wavelength measuring device and method based on difference frequency double combs |
| CN113483878A (en) * | 2021-06-18 | 2021-10-08 | 中国科学院上海技术物理研究所 | Micro Doppler vibration measurement system and method based on bidirectional acousto-optic frequency comb |
| CN113483878B (en) * | 2021-06-18 | 2022-03-29 | 中国科学院上海技术物理研究所 | Micro Doppler vibration measurement system and method based on bidirectional acousto-optic frequency comb |
| CN114295583A (en) * | 2021-11-26 | 2022-04-08 | 中国地质调查局水文地质环境地质调查中心 | Coherent measurement device for greenhouse gas |
| CN114295583B (en) * | 2021-11-26 | 2023-12-26 | 中国地质调查局水文地质环境地质调查中心 | Coherent measurement device for greenhouse gas |
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