CN105548036A - Self-adaptive double-light-comb spectrum system - Google Patents
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Abstract
The invention relates to a self-adaptive double-light-comb spectrum system. The system includes two pulse lasers, one or two continuous lasers, and optical beat frequency modules which are used for detecting beat frequency signals generated from any combination of the pulse lasers and the continuous lasers. One path of the beat frequency signals are directly sent to a circuit processing module, and the other path passes through filters for smoothing and is sent to frequency counting. The counted number is compared with a set value. A control signal is output to a frequency slow feedback module. Working parameters of the continuous lasers are adjusted to enable the obtained beat frequency signals to work in a defined range. The circuit processing module carries out circuit treatment including smoothing, frequency mixing, and frequency doubling on the beat frequency signals in order to extract a compensating signal representing double-light-comb repetition frequency and carrier envelope phase jitter. Frequency counting and slow feedback are adopted to control drift of the beat frequency signals of pulsed light and continuous light in self-adaptive double-light-comb spectrum measurement to be in a certain frequency range. It is ensured that the beat frequency signals can stably exist for a long time, thereby improving stability of the self-adaptive double-light-comb spectrum system.
Description
Technical field
The present invention relates to a kind of detecting technique, particularly a kind of self-adaptation two light comb spectroscopic system.
Background technology
Two light comb spectral technique, as the advanced subject of scientific research field in recent years, can improve the precision of spectrographic detection greatly.Two light comb spectrographic detection technology compares conventional art two improvement, and one is adopt light comb to substitute conventional light source, and the frequency spectrum position as standard is more stable, and live width is narrower, and precision is higher; Another is that the slightly discrepant light comb of employing two repetition frequencys is measured simultaneously, combs, is similar to the main scale of vernier caliper and secondary chi for one for one, by frequency dislocation and beat frequency detection, improve the precision of frequency measurement further as with reference to light comb as exciting light.
Present stage, the concrete methods of realizing of two light comb spectral technique can be divided into traditional two light comb spectrum and self-adaptation two light comb spectrum substantially.Wherein, traditional two light comb spectrum are the precision of being combed by precise hard_drawn tuhes light, realize the object improving measuring accuracy.Light comb controls the control being specifically divided into repetition frequency and carrier envelope phase, for reaching the spectral measurement precision of Doppler, requires that the synchronization jitter of the time jitter that single light is combed and two light combs is at Ah's second-time.In practical operation, due to the optical phase noise introduced in super continuous spectrums spreading process when measuring carrier envelope signal, and the noise in electronic circuits that the lock-in amplifier of rapid feedback is introduced, the control accuracy be difficult to light is combed accomplishes Ah's second-time, limits its application in high precision spectral measurement.
Self-adaptation two light comb spectrum is the processing stage that the difficulty that optical detection and electricity lock having been transferred to spectral signal.Briefly, self-adaptation two light comb spectrum is not the optical frequency com of employing two precision locking, but adopt two pulsed lasers freely operated and one to two continuous wave laser, by the beat signal between pulsed laser and continuous wave laser, obtain the feedback signal characterizing carrier envelope phase and repetition frequency shake, then these two feedback signals are applied in the signal processing of spectrographic detection, compensate the carrier phase jitter of free running laser and repetition frequency shake, obtain clearly, accurate spectral signal.But, because two pulsed lasers are free, random, onrelevant running completely, this can cause the increase along with the system duration of runs, the beat signal long-term drift amount of pulsed laser and continuous wave laser is very large, even exceed the bandwidth of wave filter, cause the loss of compensating signal during signal transacting, and then cause the inefficacy of self-adaptation two light comb spectroscopic system.
In sum, the light source of traditional two light comb spectrum is pulsed lasers that are tight, accurate lock, but is limited to the optoelectronic noise introduced in measurement and control procedure, cannot obtain the spectral measurement precision meeting Doppler; And the light source of existing self-adaptation two light comb spectroscopic system is complete free, random, uncorrelated running, although the method avoids the noise in measurement and control procedure, but there is the major hidden danger that beat signal is lost, the stability of influential system long-term operation, reliability.
Summary of the invention
The present invention be directed to present self-adaptation two light comb spectroscopic system Problems existing, propose a kind of self-adaptation two light comb spectroscopic system, adopt the mode of frequency counting and slow feedback, by the beat signal drift control of the pulsed light in two for self-adaptation light comb spectral measurement and continuous light in certain frequency range, ensure that beat signal long-term stability exists, and then improve the stability of self-adaptation two light comb spectral measurement system.。
Technical scheme of the present invention is: a kind of self-adaptation two light comb spectroscopic system, comprise two pulsed lasers, one or two continuous wave lasers, sample cell, optical beat module, wave filter, frequency counting and the slow feedback module of frequency, processing of circuit module, interference signal detection and signal processing module, the beat signal of optical beat module direct impulse laser instrument and continuous wave laser combination in any, gained beat signal is divided into two-way, processing of circuit module is directly delivered on one tunnel, frequency counting is sent on another road after filtering device filtering, measure the occurrence of beat signal, beat signal value exceeds set bound, output a control signal to the slow feedback module of frequency, the running parameter of frequency slow feedback module output signal adjustment continuous wave laser, gained beat signal is made to be operated in limited range, processing of circuit module carries out filtering to the beat signal received, mixing, frequency multiplication, after amplification, extract the Δ f of the carrier envelope phase relative jitter of two pulsed lasers
0compensating signal, after two pulse lasers export two-beam conjunction bundle, incides sample cell simultaneously, then carries out interference signal detection, obtain the interference signal of two pulsed lasers, by interference signal and Δ f
0compensating signal is input to signal processing module process simultaneously, obtains results of spectral measurements.
When described system comprises two continuous wave lasers, processing of circuit module receives 4 beat signals, and processing of circuit module, to after 4 beat signal filtering, mixing, frequency multiplication, amplification, obtains the Δ f of sign two pulse laser repetition frequency relative jitter
rthe Δ f of compensating signal and both carrier envelope phase relative jitter
0compensating signal, two compensating signals send signal processing module process.
When described system only comprises a continuous wave laser, processing of circuit module receives 2 beat signals, and processing of circuit module, to after 2 beat signal filtering, mixing, frequency multiplication, amplification, obtains the Δ f of two pulse laser carrier envelope phase relative jitter
0compensating signal, two pulse lasers carry independently repetition frequency detection and repetition frequency locking module, the repetition frequency of lock pulse laser instrument.
The described output spectrum of two pulsed lasers and the output wavelength of one or two continuous wave laser meet qualifications: the spectrum of two pulsed lasers has overlapped part, the output wavelength of one or two continuous wave laser is in this overlapped spectra district, and the wavelength of two continuous wave lasers is not identical.
Described optical beat module comprises wavelength division multiplexer or light combination mirror, photodetector.
Beneficial effect of the present invention is: self-adaptation of the present invention two light comb spectroscopic system, adopts the mode of frequency counting and slow feedback, by the drift scope control of beat signal in certain scope, is conducive to realizing self-adaptation steady in a long-term two light comb spectral measurement; The effect that frequency is fed back slowly is only the scope of restriction beat signal, instead of beat signal is locked in a very accurate particular value, this reduces the bandwidth sum complexity of feedback line, the noise in electronic circuits of introducing is less, and the measuring accuracy of two light comb spectrum is higher; It is various informative that frequency is fed back slowly, and can be, but not limited to the pumping current, polarization state, working temperature, the output optical frequency that control laser instrument, practical application is more convenient, and the selection mode of controlled quentity controlled variable is more flexible; Self-adaptation steady in a long-term two light comb spectral technique, is applicable to all wave bands, can improve ultraviolet, in the stability of wave band self-adaptation two light comb spectral measurement system such as infrared, Terahertz.
Accompanying drawing explanation
Fig. 1 is self-adaptation of the present invention two light comb spectroscopic system schematic diagram;
Fig. 2 is two pulse two continuous light self-adaptations two light comb spectral composition schematic diagram of long-term stability of the present invention;
Fig. 3 is two pulse one continuous light self-adaptations two light comb spectral composition schematic diagram of long-term stability of the present invention;
Fig. 4 is Erbium doped fiber laser self-adaptation two light comb spectral composition schematic diagram of long-term stability of the present invention.
Embodiment
Self-adaptation two light comb spectroscopic system schematic diagram, comprises pulse laser 1, pulse laser 2, continuous laser 1, continuous laser 2 as shown in Figure 1, and three beat frequency detecting modules, three frequency counting modules and three slow feedback modules of frequency.
The beat signal of the pulse laser 1 that the first beat frequency detecting module detects and continuous laser 1 is f
1.1by first frequency counting module, measure the occurrence of beat signal, then according to the bandwidth of institute's selecting filter, to drift value capping and the lower limit of this frequency, when the free drift scope of this beat signal exceeds set upper frequency limit or prescribes a time limit down, the slow feedback module of first frequency is started working, by controlling pumping current, working temperature, the output optical frequency of continuous laser 1, beat signal being limited in the frequency range of setting, ensureing that beat signal long-term stability exists.
The beat signal of the pulse laser 1 that the second beat frequency detecting module detects and continuous laser 2 is f
1.2by second frequency counting module, measure the occurrence of beat signal, then according to the bandwidth of institute's selecting filter, to drift value capping and the lower limit of this frequency, when the free drift scope of this beat signal exceeds set upper frequency limit or prescribes a time limit down, the slow feedback module of second frequency is started working, by controlling pumping current, working temperature, the output optical frequency of continuous laser 2, beat signal being limited in the frequency range of setting, ensureing that beat signal long-term stability exists.
The beat signal of the pulse laser 2 that third shot frequency detecting module detects and continuous laser 1 is f
2.1by the 3rd frequency counting module, measure the occurrence of beat signal, then according to the bandwidth of institute's selecting filter, to drift value capping and the lower limit of this frequency, when the free drift scope of this beat signal exceeds set upper frequency limit or prescribes a time limit down, the slow feedback module of 3rd frequency is started working, by pumping current, polarization state, working temperature, the output optical frequency of gating pulse laser 2, beat signal is limited in the frequency range of setting, ensures that beat signal long-term stability exists.
Slowly fed back by said frequencies counting and frequency, three equal long-term existence of beat signal between pulse laser and continuous laser can be ensured, as can be seen from the figure, after the scope of first three beat signal is determined, pulse laser 2 also can be determined with the beat signal scope of continuous laser 2.By these four beat signals after electricity filtering, mixing, frequency multiplication, amplification, obtain the compensating signal that sign pulse laser 1 is shaken with pulse laser 2 repetition frequency and carrier envelope phase, finally in two light comb spectral data analysis, add compensating signal, obtain high-precision self-adaptation two light comb results of spectral measurements.
Two pulse two continuous light self-adaptations steady in a long-term as shown in Figure 2 two light comb spectral composition schematic diagram, self-adaptation steady in a long-term two light comb spectroscopic system comprises pulse laser 1, pulse laser 2, continuous laser 1, continuous laser 2,4 optical beat modules, 3 filtering, 3 frequency countings and the slow feedback modules of frequency, and sample cell, interference signal detection, processing of circuit module, signal processing module.
Pulse laser 1 and continuous laser 1 obtain beat signal by optical beat 1, beat signal is divided into two-way, processing of circuit module is directly delivered on one tunnel, another road after filtering 1, frequency counting 1, measure the occurrence of beat signal, then according to the bandwidth of institute's selecting filter, to drift value capping and the lower limit of this frequency, when the free drift scope of this beat signal exceeds set upper frequency limit or prescribes a time limit down, the slow feedback module 1 of frequency is started working, by controlling the pumping current of continuous laser 1, working temperature, export optical frequency, beat signal is limited in the frequency range of setting, ensure that beat signal long-term stability exists.
Pulse laser 1 and continuous laser 2 obtain beat signal by optical beat 2, beat signal is divided into two-way, processing of circuit module is directly delivered on one tunnel, another road after filtering 2, frequency counting 2, measure the occurrence of beat signal, then according to the bandwidth of institute's selecting filter, to drift value capping and the lower limit of this frequency, when the free drift scope of this beat signal exceeds set upper frequency limit or prescribes a time limit down, the slow feedback module 2 of frequency is started working, by controlling the pumping current of continuous laser 2, working temperature, export optical frequency, beat signal is limited in the frequency range of setting, ensure that beat signal long-term stability exists.
Pulse laser 2 and continuous laser 2 obtain beat signal by optical beat 3, beat signal is divided into two-way, processing of circuit module is directly delivered on one tunnel, another road after filtering 3, frequency counting 3, measure the occurrence of beat signal, then according to the bandwidth of institute's selecting filter, to drift value capping and the lower limit of this frequency, when the free drift scope of this beat signal exceeds set upper frequency limit or prescribes a time limit down, the slow feedback module 3 of frequency is started working, by the pumping current of gating pulse laser 2, polarization state, working temperature, export optical frequency, beat signal is limited in the frequency range of setting, ensure that beat signal long-term stability exists.
Slowly fed back by said frequencies counting and frequency, three equal long-term existence of beat signal between pulse laser and continuous laser can be ensured, after the scope of first three beat signal is determined, the beat signal scope that pulse laser 2 and continuous laser 1 produce through optical beat 4 also can be determined.These four beat signals are sent into processing of circuit module, and the effect of this module is to after four beat signal filtering, mixing, frequency multiplication, amplification, obtains the Δ f characterizing pulse laser 1 and pulse laser 2 repetition frequency relative jitter
rcompensating signal, and the Δ f of both carrier envelope phase relative jitter
0compensating signal.
On the other hand, after pulse laser 1 and pulse laser 2 two-beam are closed bundle, incide sample cell simultaneously, then carry out interference signal detection, obtain the interference signal of two pulsed lasers.This interference signal and processing of circuit module obtains before two compensating signals are input to signal processing module simultaneously, through process, high-precision results of spectral measurements can be obtained.
Two pulse one continuous light self-adaptations steady in a long-term as shown in Figure 3 two light comb spectral composition schematic diagram, self-adaptation steady in a long-term two light comb spectroscopic system comprises pulse laser 1, pulse laser 2, continuous laser 1,2 optical beat modules, 2 filtering, 2 frequency countings and the slow feedback modules of frequency, and sample cell, interference signal detection, processing of circuit module, signal processing module.Meanwhile, two pulsed lasers are separately all with repetition frequency detection and repetition frequency locking module.
Pulse laser 1 and continuous laser 1 obtain beat signal by optical beat 1, beat signal is divided into two-way, processing of circuit module is directly delivered on one tunnel, another road after filtering 1, frequency counting 1, measure the occurrence of beat signal, then according to the bandwidth of institute's selecting filter, to drift value capping and the lower limit of this frequency, when the free drift scope of this beat signal exceeds set upper frequency limit or prescribes a time limit down, the slow feedback module 1 of frequency is started working, by controlling the pumping current of continuous laser 1, working temperature, export optical frequency, beat signal is limited in the frequency range of setting, ensure that beat signal long-term stability exists.
Pulse laser 2 and continuous laser 1 obtain beat signal by optical beat 2, beat signal is divided into two-way, processing of circuit module is directly delivered on one tunnel, another road after filtering 2, frequency counting 2, measure the occurrence of beat signal, then according to the bandwidth of institute's selecting filter, to drift value capping and the lower limit of this frequency, when the free drift scope of this beat signal exceeds set upper frequency limit or prescribes a time limit down, the slow feedback module 2 of frequency is started working, by the pumping current of gating pulse laser 2, polarization state, working temperature, export optical frequency, beat signal is limited in the frequency range of setting, ensure that beat signal long-term stability exists.
Pulse laser 1 and pulse laser 2, all with the detection of independently repetition frequency and repetition frequency locking module, after measuring respective repetition frequency, then pass through the repetition frequency of the accurate gating pulse laser instrument of locking module.Due to the repetition frequency accurate lock of two pulse lasers, therefore in self-adaptation two light comb spectral measurement, the shake of repetition frequency is controlled, and only needs the relative jitter compensating signal Δ f being obtained carrier envelope phase by beat signal
0.
Slowly fed back by said frequencies counting and frequency, two equal long-term existence of beat signal between pulse laser and continuous laser can be ensured, these two beat signals are sent into processing of circuit module, the effect of this module is to after two beat signal filtering, mixing, frequency multiplication, amplification, obtains the Δ f characterizing pulse laser 1 and pulse laser 2 carrier envelope phase relative jitter
0compensating signal.
On the other hand, after pulse laser 1 and pulse laser 2 two-beam are closed bundle, incide sample cell simultaneously, then carry out interference signal detection, obtain the interference signal of two pulsed lasers.By this interference signal and the compensating signal Δ f that obtains of processing of circuit module before
0be input to signal processing module simultaneously, through process, high-precision results of spectral measurements can be obtained.
Erbium doped fiber laser self-adaptation steady in a long-term as shown in Figure 4 two light comb spectral composition schematic diagram, Erbium doped fiber laser self-adaptation steady in a long-term two light comb spectroscopic system comprises pulse laser 1, pulse laser 2, continuous laser 1, continuous laser 2,4 wavelength division multiplexer WDM, 5 detector PD, 3 wave filter BP, 3 frequency countings and the slow feedback module COMP of frequency, and sample cell, processing of circuit module, signal processing module.
Pulse laser 1 and continuous laser 1 are coupled in same optical fiber by wavelength division multiplexer WDM, beat signal is obtained again by detector PD, beat signal is divided into two-way, processing of circuit module is directly delivered on one tunnel, another road is device BP after filtering, frequency counting and the slow feedback module COMP of frequency, measure the occurrence of beat signal, then according to the bandwidth of institute's selecting filter, to drift value capping and the lower limit of this frequency, when the free drift scope of this beat signal exceeds set upper frequency limit or prescribes a time limit down, frequency is fed back slowly and is started working, by controlling the pumping current of continuous laser 1 beat signal is limited in the frequency range of setting, ensure that beat signal long-term stability exists.
Pulse laser 1 and continuous laser 2 are coupled in same optical fiber by wavelength division multiplexer WDM, beat signal is obtained again by detector PD, beat signal is divided into two-way, processing of circuit module is directly delivered on one tunnel, another road is device BP after filtering, frequency counting and the slow feedback module COMP of frequency, measure the occurrence of beat signal, then according to the bandwidth of institute's selecting filter, to drift value capping and the lower limit of this frequency, when the free drift scope of this beat signal exceeds set upper frequency limit or prescribes a time limit down, frequency is fed back slowly and is started working, by controlling the pumping current of continuous laser 2 beat signal is limited in the frequency range of setting, ensure that beat signal long-term stability exists.
Pulse laser 2 and continuous laser 2 are coupled in same optical fiber by wavelength division multiplexer WDM, beat signal is obtained again by detector PD, beat signal is divided into two-way, processing of circuit module is directly delivered on one tunnel, another road is device BP after filtering, frequency counting and the slow feedback module COMP of frequency, measure the occurrence of beat signal, then according to the bandwidth of institute's selecting filter, to drift value capping and the lower limit of this frequency, when the free drift scope of this beat signal exceeds set upper frequency limit or prescribes a time limit down, frequency is fed back slowly and is started working, by the pumping current of gating pulse laser 2, beat signal is limited in the frequency range of setting, ensure that beat signal long-term stability exists.
Slowly fed back by said frequencies counting and frequency, three equal long-term existence of beat signal between pulse laser and continuous laser can be ensured, after the scope of first three beat signal is determined, pulse laser 2 and continuous laser 1 through wavelength division multiplexer close restraint after the beat signal scope that produces also can determine.These four beat signals are sent into processing of circuit module, and the effect of this module is to after four beat signal filtering, mixing, frequency multiplication, amplification, obtains the Δ f characterizing pulse laser 1 and pulse laser 2 repetition frequency relative jitter
rcompensating signal, and the Δ f of both carrier envelope phase relative jitter
0compensating signal.
On the other hand, after pulse laser 1 and pulse laser 2 two-beam are closed bundle, incide sample cell simultaneously, then use detector measurement interference signal.This interference signal and processing of circuit module obtains before two compensating signals are input to signal processing module simultaneously, through process, high-precision results of spectral measurements can be obtained.
The described output spectrum of two pulsed lasers and the output wavelength of one or two continuous wave laser meet specific qualifications: the spectrum of two pulsed lasers has overlapped part, the output wavelength of one or two continuous wave laser is in this overlapped spectra district, and the wavelength of two continuous wave lasers is not identical.
Described optical beat module comprises wavelength division multiplexer or light combination mirror, photodetector.
The specific implementation of the slow feedback module of described frequency includes but not limited to laser temperature control, laser pumping Current Control, laser instrument polarization state control and carry out the control of laser instrument optical frequency by acousto-optic frequency shifters.
Described interference signal detection, processing module comprise photodetector, and single-chip microcomputer or programmable logic device (PLD), it is input as interference signal that photodetector measures and the compensating signal from processing of circuit module, above-mentioned signal, through single-chip microcomputer or programmable logic device (PLD) process, exports as results of spectral measurements.
Claims (5)
1. self-adaptation two light comb spectroscopic system, it is characterized in that, comprise two pulsed lasers, one or two continuous wave lasers, sample cell, optical beat module, wave filter, frequency counting and the slow feedback module of frequency, processing of circuit module, interference signal detection and signal processing module, the beat signal of optical beat module direct impulse laser instrument and continuous wave laser combination in any, gained beat signal is divided into two-way, processing of circuit module is directly delivered on one tunnel, frequency counting is sent on another road after filtering device filtering, measure the occurrence of beat signal, beat signal value exceeds set bound, output a control signal to the slow feedback module of frequency, the running parameter of frequency slow feedback module output signal adjustment continuous wave laser, gained beat signal is made to be operated in limited range, processing of circuit module carries out filtering to the beat signal received, mixing, frequency multiplication, after amplification, extract the Δ f of the carrier envelope phase relative jitter of two pulsed lasers
0compensating signal, after two pulse lasers export two-beam conjunction bundle, incides sample cell simultaneously, then carries out interference signal detection, obtain the interference signal of two pulsed lasers, by interference signal and Δ f
0compensating signal is input to signal processing module process simultaneously, obtains results of spectral measurements.
2. the two light of self-adaptation combs spectroscopic system according to claim 1, it is characterized in that, when described system comprises two continuous wave lasers, processing of circuit module receives 4 beat signals, processing of circuit module, to after 4 beat signal filtering, mixing, frequency multiplication, amplification, obtains the Δ f of sign two pulse laser repetition frequency relative jitter
rthe Δ f of compensating signal and both carrier envelope phase relative jitter
0compensating signal, two compensating signals send signal processing module process.
3. the two light of self-adaptation combs spectroscopic system according to claim 1, it is characterized in that, when described system only comprises a continuous wave laser, processing of circuit module receives 2 beat signals, processing of circuit module, to after 2 beat signal filtering, mixing, frequency multiplication, amplification, obtains the Δ f of two pulse laser carrier envelope phase relative jitter
0compensating signal, two pulse lasers carry independently repetition frequency detection and repetition frequency locking module, the repetition frequency of lock pulse laser instrument.
4. self-adaptation two light comb spectroscopic system according to claims 1 to 3 any one, it is characterized in that, the described output spectrum of two pulsed lasers and the output wavelength of one or two continuous wave laser meet qualifications: the spectrum of two pulsed lasers has overlapped part, the output wavelength of one or two continuous wave laser is in this overlapped spectra district, and the wavelength of two continuous wave lasers is not identical.
5. self-adaptation two light comb spectroscopic system according to claims 1 to 3 any one, it is characterized in that, described optical beat module comprises wavelength division multiplexer or light combination mirror, photodetector.
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| CN105823559A (en) * | 2016-05-11 | 2016-08-03 | 上海朗研光电科技有限公司 | Adaptive double optical comb spectral compensation signal extraction method |
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| CN112033551A (en) * | 2020-09-04 | 2020-12-04 | 中国航空工业集团公司北京长城计量测试技术研究所 | Wavelength measuring device and method for broadband tunable laser |
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