CN109301687A - Laser automatic frequency stabilization system based on intelligent saturated absorption spectrum identification technology - Google Patents
Laser automatic frequency stabilization system based on intelligent saturated absorption spectrum identification technology Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/13—Stabilisation of laser output parameters, e.g. frequency or amplitude
- H01S3/136—Stabilisation of laser output parameters, e.g. frequency or amplitude by controlling devices placed within the cavity
- H01S3/137—Stabilisation of laser output parameters, e.g. frequency or amplitude by controlling devices placed within the cavity for stabilising of frequency
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/11—Mode locking; Q-switching; Other giant-pulse techniques, e.g. cavity dumping
- H01S3/1106—Mode locking
- H01S3/1112—Passive mode locking
- H01S3/1115—Passive mode locking using intracavity saturable absorbers
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- Optics & Photonics (AREA)
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Abstract
The invention provides a laser automatic frequency stabilization system based on a saturated absorption spectrum intelligent identification technology, which comprises a laser closed-loop locking circuit and an automatic relocking circuit. The closed-loop locking loop consists of an atomic absorption gas chamber, a frequency discriminator based on a saturated absorption spectrum and a feedback controller, and realizes the closed-loop locking of the laser frequency; the automatic relocking loop combines a mode recognition technology in artificial intelligence with a classical photoelectric technology, so that the working state of the laser can be accurately and automatically tuned, and a locking point in a saturated absorption spectrum can be searched. When the laser frequency is in a locking state, the laser closed-loop locking circuit keeps working to realize the locking of the laser frequency; when the laser frequency is in the unlocked state, the relock loop relocks the laser frequency through a series of automated operations. The one-key automatic locking and the automatic relocking after the unlocking of the laser frequency can be realized, and the method has the characteristics of strong function, high intelligent degree, strong robustness and wide applicability. The invention is applied to the field of laser frequency stabilization.
Description
Technical field
The present invention relates to laser frequency stabilization field more particularly to a kind of laser based on saturated absorption spectrum intelligent identification technology certainly
Dynamic frequency stabilization system.
Background technique
The birth of laser has pushed a series of progress of science and technology.To obtain satisfactory laser, that is, require to swash
Line width, the frequency stability of light are high, and researchers have studied laser closed loop frequency stabilization system.Typical laser closed loop frequency stabilization system by
Reference frequency, frequency discriminator, feedback controller three parts composition.Widely used reference frequency has the jump frequency of atom or molecule
With the characteristic frequency of optical resonator.Most important difference is the difference of frequency discrimination method.Made using the jump frequency of atom and molecule
For reference frequency, frequency discrimination signal is often obtained from the absorption spectrum of atom and molecule or dispersion spectrum, researchers devise many
Frequency discrimination method and its Frequency Stabilization Technique, such as modulated spectrum Frequency Stabilization Technique, Modulation Transfer spectrum (MTS) Frequency Stabilization Technique, biasing spectrum frequency stabilization
Technology, mangneto dichroism Frequency Stabilization Technique etc..The transmission of the F-P cavity of high q-factor and reflection characteristic have similar to Atomic absorption spectral line
Characteristic, have extremely narrow line width, the typical Frequency Stabilization Technique based on F-P cavity is PDH (Pound-Drever-Hall) frequency stabilization skill
Art.
The closed loop Frequency Stabilization Technique of laser passes through the development of many years, achievement very outstanding is achieved, in many research fields
It has been widely used, however its presence is obviously insufficient, is mainly reflected in the unstable of laser frequency stabilizing system, i.e., easily
There is lock-off phenomenon.This is because effective frequency-locking range of above-mentioned laser closed loop Frequency Stabilization Technique is usually relatively narrow, when laser system is held
When by inevitable interference, laser frequency jumps out effective frequency-locking range and lock-off occurs.This kind of phenomenon seriously limits sharp
The application scenarios of light closed loop frequency stabilization system, such as long-time, field complex environment, unattended, spaceborne experiment.
Summary of the invention
Aiming at the problem that lock-off phenomenon existing for the prior art laser closed loop frequency stabilization system, the object of the present invention is to provide one
Laser automatic freqauency stabilization system of the kind based on saturated absorption spectrum intelligent identification technology can be realized the automatic locking of laser frequency and take off
It is re-locked automatically after lock, has the characteristics that intelligent, powerful, strong robustness, applicability are wide.
In order to achieve the above-mentioned object of the invention, the present invention constructs automatic freqauency stabilization system on the basis of laser closed loop frequency stabilization system
Mode identification technology in artificial intelligence is combined with classical photoelectric technology, devises saturation based on support vector machines and inhale by system
Spectrum intelligent identification technology is received, can accurately the output mode of automatic tuning laser laser and working condition, search saturation be inhaled
Receive spectrum in keyed end, realize laser auto frequency locking and lock-off after re-lock automatically.Concrete scheme is:
With reference to Fig. 1, a kind of laser automatic freqauency stabilization method based on saturated absorption spectrum intelligent identification technology, is a kind of double loop
Control structure, working mechanism are
The working condition of frequency-locked state monitor real time monitoring frequency stabilization system:
If laser frequency is in lockable state, laser closed loop locked loop keeps work, locks the tranmitting frequency of laser
It is scheduled on target frequency value；
If laser frequency is in delocking state, starting re-locks circuit automatically, composes intelligent identification technology according to saturated absorption
Laser is adjusted to good single mode operation state, i.e. laser has wide tuning without mode skip range.And identify saturated absorption
All lockable points in spectrum, the i.e. corresponding absorption peak of hyperfine transition frequency of atom, and according to target frequency value all
Target lock-on point is determined in lockable point.Then, according to target lock-on point by laser frequency tuning to preset effective frequency locking model
In enclosing and laser closed loop locked loop is reactivated, is relocked after laser frequency lock-off can be realized, wherein good single mode
Output state, that is, laser has wide tuning without mode skip range (Wide Mod-hop Free Tuning Range, WMFTR) shape
State.
By above-mentioned mechanism, laser frequency is constantly in the automatic freqauency stabilization system " to be re-locked after locking, losing lock, locks
Automatic cycle calmly ... ".
As a further improvement of the above technical scheme, the laser closed loop locked loop keeps work, makes laser frequency
The process for being locked in target frequency value specifically includes:
A1, in real time the saturated absorption signal and frequency discrimination signal under acquisition laser current state；
A2, feedback control algorithm are according to the control amount of frequency error computing laser；
A3, feedback compensation is carried out according to output frequency of the control amount to laser.
As a further improvement of the above technical scheme, the circuit that re-locks specifically includes:
B1, the driving current of laser is automatically regulated to change the output mode of laser, make the frequency of its output mode
Rate range includes laser frequency to be locked；
Laser is adjusted to WMFTR state, can pass through saturation by B2, the controling parameter for automatically regulating laser
Absorption spectra (SAS) determines whether laser is in WMFTR state.Specifically, the process is known based on the intelligence that saturated absorption is composed
Other technology realizes automation and intelligence, and the intelligent identification technology of saturated absorption spectrum is to be inhaled saturation by design Intelligence Classifier
It receives spectrum and is divided into two classes, characterize whether laser is in WMFTR state respectively, and then laser is finally adjusted to be saturated with standard
The WMFTR state of absorption spectra characterization；
All lockable points in B3, search and localization criteria saturated absorption spectrum, i.e., it is each in positioning saturated absorption spectrum
Absorption peak corresponding to a hyperfine transition frequency, and laser frequency is zoomed to by the corresponding effective lock of target lock-on point based on this
Within the scope of frequency.
As a further improvement of the above technical scheme, in step B2, the intelligent identification technology packet of the saturated absorption spectrum
Processed offline and in real time processing are included, is specifically included:
B21, in processed offline, acquire several saturated absorptions spectrum in several cases as sample, and to each sample
Corresponding laser works state is labeled in this, composing training sample set；
B23, feature vector, constitutive characteristic vector are extracted from each saturated absorption spectrum sample according to feature extraction algorithm
Training set；
B24, building classifier, are trained classifier using feature vector training set, and by the classification results of sample
Error-tested is carried out with mark true value, with the parameter of Optimum Classification device；
B25, in real-time processing, saturated absorption spectrum signal is obtained in real time, according to feature extraction identical with step B23
Algorithm extracts feature vector, is classified using the classifier after optimizing in step B24 to real-time saturated absorption spectrum, according to classification
As a result determine whether laser works in WMFTR state at this time.
As a further improvement of the above technical scheme, described full from each according to feature extraction algorithm in step B23
It is specifically included with feature vector is extracted in absorption spectra sample:
B231, the segment of different scale is extracted from standard saturated absorption spectrum (laser is in WMFTR state) as mould
Plate；
B232, the cross-correlation sequence for calculating each template and saturated absorption to be sorted spectrum, and therefrom extract maximum cross-correlation
Information, i.e. maximum value and corresponding position in the sequence；
The cross-correlation information of B233, saturated absorption spectrum to be sorted and absorption spectra and multiple dimensioned template forms saturated absorption spectrum
Sampling feature vectors.
As a further improvement of the above technical scheme, in step B24, the classifier is support vector machines.
In order to realize foregoing invention content, the present invention provides a kind of laser based on saturated absorption spectrum intelligent identification technology
The implementation and device of automatic freqauency stabilization system, including laser, laser driver, primary processor, feedback controller, frequency discrimination
Device, low precision wavemeter.The laser driver is for realizing the control and driving to laser, and primary processor is for acquiring letter
Number, the working condition of analysis system, the workflow of control system, frequency discriminator be used for obtain atom saturated absorption signal and mirror
Frequency signal, low precision wavelength are used for the output frequency of rough measure laser, and feedback controller is used for the output frequency to laser
Rate carries out feedback compensation.
As a further improvement of the above technical scheme, the program on the primary processor includes that frequency-locked state differentiates mould
Block, laser output mode selecting module, real-time SAS Intelligence Classifier module, SAS keyed end search module, laser control mould
Block.
Advantageous effects of the invention:
The present invention constructs the intelligent laser automatic freqauency stabilization system of double-loop control structure, including closed loop locked loop and one
Keyed re-locks circuit automatically.The system function is powerful, and no matter which kind of state laser is in, can be by complete automatic
Process realizes that the automatic locking of laser frequency re-locks automatically with after lock-off.The system innovation by the mode in artificial intelligence
Identification technology, can be more quickly and accurately based on the intelligent identification technology of saturated absorption spectrum in conjunction with typical photoelectric technology
Differentiate and the working condition of adjustment laser, search target lock-on point, the automatic freqauency stabilization system for realization laser provide one
Intelligentized solution.The system can be widely used in being normally applied for automatic freqauency stabilization system, for different experimental rings
Border and system configuration only need to change corresponding module.Therefore, the system have intelligent, powerful, strong robustness,
The wide feature of applicability.
Detailed description of the invention
Fig. 1 is the intelligent laser automatic freqauency stabilization system schematic of the invention based on double-loop control structure.
Fig. 2 is overall system design figure in specific embodiments of the present invention.
Fig. 3 is MTS frequency discriminator photovoltaic principals figure in specific embodiments of the present invention.
Fig. 4 is the functional block diagram of the SAS intelligent identification Method in specific embodiments of the present invention based on support vector machines.
Fig. 5 is the template schematic diagram of feature extraction in specific embodiments of the present invention.
Fig. 6 is the training result of the SAS intelligent identification technology in specific embodiments of the present invention based on support vector machines.
Specific embodiment
In order to which the purposes, technical schemes and advantages of the disclosure are more clearly understood, under in conjunction with specific embodiments, and according to
Attached drawing, the present invention is described in more detail.It should be noted that in attached drawing or specification description, the content that does not describe with
And part English is abbreviated as content known to those of ordinary skill in technical field.The some spies given in the present embodiment
Parameter is determined only as demonstration, and the value can change accordingly to suitably be worth in different real-time modes.
With reference to Fig. 2, in the present embodiment, laser is 780nm external cavity semiconductor laser, and the laser of output passes through two
Beam splitter is divided into three beams, wherein a high-power beam splitting light is exported as frequency stabilization system, two small-power beam splitting light are respectively used to frequency discrimination
Device and wavemeter.Wavemeter (precision 1GHz) rough measure laser frequency (Freq) is used to differentiate the output mode of laser；
With reference to Fig. 3, the beam splitting light into MTS frequency discriminator is divided into detection light and pump light, through the modulated pump light of EOM and detection light
Modulation Transfer occurs for reversed be overlapped in rubidium (Rb) bubble.Detection light after being absorbed by Rb bubble is converted into electricity by photodetector (PD)
Signal, i.e. saturated absorption signal (SAS), the demodulated acquisition frequency discrimination signal (FDS) of saturated absorption signal.Freq signal is directly adopted
Collect to primary processor；SAS and FDS is transmitted to primary processor after feedback controller acquires again.
With reference to Fig. 2, the workflow of system are as follows: frequency-locked state monitor determines the lock state of laser frequency, if laser
It is in lock state, closed loop locked loop (Cycle A) is made to keep work, is i.e. feedback controller is calculated according to frequency error signal
Control amount carries out feedback control with driving current and piezoelectric ceramics (PZT) voltage of two channel of speed to laser；If at laser
In out-of-lock state, starting re-locks circuit (Cycle B), is retuned back laser frequency by a series of automatic control processes
Preset effective frequency-locking range activates Cycle A to relock laser frequency again.
The process of counterweight locked loop describes in detail below:
B1: for 780nm external cavity semiconductor laser, there are many different output modes, each mode is corresponding
Reference frequency output is different.To in this present embodiment by a certain hyperfine jump on laser frequency lock to Rb-D2 transition line
Move frequency, it is necessary first to laser frequency is adjusted to corresponding mode, frequency range be about 384225 < Freq <
384238GHz.The automation of this process is by adjusting the driving current of laser in an orderly manner and passing through a low precision wavemeter
Rough measure laser frequency judges.
B2: after B1, the electric current and PZT voltage for needing to adjust laser in an orderly manner are so that laser is in suitable work
Make state, for external cavity semiconductor laser, refers to wider tuning without mode skip range (Wide Mod-hop Free
Tuning Range, WMFTR) state.The effective ways for judging whether external cavity semiconductor laser is in WMFTR state are analyses
SAS is composed in its saturated absorption, because the saturated absorption spectrum of acquisition has consistent characteristic when laser is in WMFTR state, is claimed
For standard saturated absorption spectrum, otherwise, SAS more or less composes with standard saturated absorption not identical.Therefore, by whether judging SAS
Have with the consistent characteristic of standard SAS it may determine that whether laser works in the state of WMFTR.
With reference to Fig. 4, the present embodiment discloses one kind based on support vector machines (Support Vector Machine, SVM)
SAS intelligent identification technology.
With reference to Fig. 5, in the present embodiment, by between normalized crosscorrelation algorithm evaluation standard SAS and SAS to be sorted
Similarity extract partial feature value.Its formula of cross correlation algorithm is as follows
In formula,CorrxyIt (m) is SAS to be sorted
Signal (Sx) and standard SAS signal (Sstd) between normalized crosscorrelation value.
Firstly, needing to calculate the Corr under different scale to make characteristic extraction procedure more fullyxy(m) value, this implementation
Example is extracted 5 segments as template, such as the T in Fig. 5 from a standard SAS signaljShown, corresponding is Rb-D2
Hyperfine energy level absorption spectra (F=x → F'=of saturated absorption spectrum and each ground state? the hyperfine absorption peak that middle difference x is formed
Group).Obtain 5 cross correlation results Corrj(m) (j=1,2L 5) calculates its maximum similarity and its in SAS sample sequence
Corresponding position, i.e.,
Sj=max (Corrj(m))
Pj=m | Corrj(m)=Sj}
It is furthermore noted that, at the far detuning place of atomic transition frequency, atom pair laser is hardly in Rb-D2 saturated absorption spectrum
It absorbs, flat line style is showed in saturated absorption spectrum, such as the R in Fig. 5jIt is shown, thus need to calculate the smooth of the region
Spend FjTo reflect its feature., it is worthwhile to note that due under different conditions, such as light-intensity variation, pump light and detection optical registration, rubidium
A degree of variation can occur for the saturated absorption of the temperature change etc. of bubble, atom pair laser, in order to accurate evaluation standard SAS's
It is specific, the standard SAS under M different situations is acquired in the present embodiment.Finally, to be sorted from one by above-mentioned algorithm
SAS signal extraction go out M feature vector FVj(j=1,2 ... M), and
FV=(S1,S2,S3,S4,S5,D1,D2,D3,D4,F1,F2,F3,F4)T
In formula, Dj=Pj+1-P1For determining TjBetween relative position in SAS sample sequence.
In mode identification technology, support vector machines (Support Vector Machine, SVM) is with excellent properties
Classifier, its principle is that optimal hyperplane is found in characteristic vector space, by the separation of inhomogeneous feature vector super
The both sides of plane, to realize the purpose of classification.Using following formula can be reduced to when SVM
In formula, αi,K(·),si, b is the parameter of support vector machines respectively, can be during being trained to SVM really
Fixed, x is feature vector, and C (x) is the function interval between feature vector and hyperplane, it is meant that the absolute value at function interval is got over
Greatly, remoter apart from hyperplane, classifying quality is more significant.
With reference to Fig. 4, this specific embodiment devises 2 grades of SVM (2L-SVM) classifiers, in first order SVM, SVMjRespectively
To FVjClassify, obtained result Cj(FVj) the new feature vector of composition, i.e.,
FVsum=(C1,C2...,CM)T
M=4 in this experiment.In the SVM of the second level, SVMsumTo FVsumClassify, obtains final classification results
Csum(FVsum)。
In the experiment of this specific embodiment, several SAS signals is acquired in all cases and constitutes training sample set,
And done corresponding mark, i.e.,
D={ (xi,yi),yi∈{-1,+1}}
The capacity of sample set D has been more than 700, is acquired respectively when laser is in different working conditions.
Result by sample set training 2L-SVM is as shown in Figure 6, wherein the point of Blue circles label is -1 sample, green
The point of color addition marks is+1 sample, and C=+1 and C=-1 are respectively the classification critical line of SVM, and the point on critical line is as so-called
Supporting vector, as seen from the figure, classification results have very high accuracy rate.In Fig. 6, -1 sample is mistakenly divided there are two
It is within two critical lines, this is because be actually difficult all to separate all feature vectors just on the both sides of hyperplane, because
When this theoretically meets certain constraint condition, the classification results of partial error is allowed to exist in the training process of SVM.It is specific at this
For the false positive rate of strict control in embodiment, the result of the 2L-SVM classifier of setting such as following formula is determined
Y=sgn (Csum(FVsum)-1)
This specific embodiment has carried out real-time testing to 2L-SVM classifier, shows and the consistent good effect of training process
Fruit.It is indicated above that can accurately identify whether SAS belongs to standard SAS letter by the SAS intelligent identification Method designed based on SVM
Number, to judge whether laser works in WMFTR state.
B3: laser is being adjusted to WMFTR state by intelligent recognition SAS signal, is needing to scale laser frequency
To effective frequency-locking range of setting, i.e., at the corresponding absorption peak of a certain hyperfine transition.Firstly, in characteristic extraction procedure,
Characteristic element P can be passed throughjTo position T in saturated absorption spectrumjThe position in region, and with this calculate PZT voltage frequency sweep center and
SAS is zoomed to the T comprising frequency to be locked by frequency sweep amplitudejRegion.Then, by detecting TjHyperfine suction present in region
Receive peak, and sort and can determine the position of each hyperfine absorption peak, can keyed end position, i.e., based on feature
It extracts to determine the target lock-on point in saturated absorption spectrum.Then, frequency sweep center and the frequency sweep amplitude of PZT voltage are calculated again
Laser frequency is zoomed within the corresponding effective frequency-locking range of preset keyed end.So far, it closes frequency sweep and closed loop is activated to lock
Laser frequency can be relocked in object reference frequency by determining circuit.
Contain the explanation of the preferred embodiment of the present invention above, this be for the technical characteristic that the present invention will be described in detail, and
Be not intended to for summary of the invention being limited in concrete form described in embodiment, according to the present invention content purport carry out other
Modifications and variations are also protected by this patent.The purport of the content of present invention is to be defined by the claims, rather than by embodiment
Specific descriptions are defined.
Claims (6)
1. a kind of laser automatic freqauency stabilization method based on saturated absorption spectrum intelligent identification technology, it is characterised in that double loop control knot
Structure:
The working condition of frequency-locked state monitor real time monitoring frequency stabilization system:
If laser frequency is in the lock state, laser closed loop locked loop keeps work, makes laser frequency lock in target frequency
Value；
If laser frequency is in delocking state, starting re-locks circuit automatically, by selection laser output mode, based on saturation
The intelligent recognition of absorption spectra and classification adjust the working condition of laser, determine target lock-on point three steps in saturated absorption spectrum
Suddenly, laser frequency is readjusted to effective frequency-locking range, and closed loop locked loop is activated to realize relocking for laser frequency.
2. the laser automatic freqauency stabilization method according to claim 1 based on saturated absorption spectrum intelligent identification technology, feature exist
In if the operation that laser frequency is under delocking state specifically includes:
B1, the output mode for automatically regulating laser, making the frequency range of its output mode includes target frequency value；
B2, laser is automatically adjusted to good single-mode output state, good single-mode output state indicates laser tool
There is wide tuning without mode skip range (WMFTR) state, wherein with the intelligent identification technology of saturated absorption spectrum to the saturation of present laser
Absorption spectra is classified, and the working condition of laser is adjusted and judged according to classification results, makes laser works full with standard
With the WMFTR state of absorption spectra characterization；
Target lockable point in B3, search and localization criteria saturated absorption spectrum, zooms to target lock-on point pair for laser frequency
In the effective frequency-locking range answered.
3. the laser automatic freqauency stabilization method according to claim 2 based on saturated absorption spectrum intelligent identification technology, feature exist
In, in step B2, the intelligent identification technology of the saturated absorption spectrum includes processed offline and processing in real time, it specifically includes:
B21, in processed offline, acquire several saturated absorptions spectrum in several cases as sample, and in each sample
Corresponding laser works state is labeled, composing training sample set；
B23, feature vector, the training of constitutive characteristic vector are extracted from each saturated absorption spectrum sample according to feature extraction algorithm
Collection；
B24, building classifier, are trained classifier using feature vector training set, and by the classification results and mark of sample
It infuses true value and carries out error-tested, with the parameter of Optimum Classification device；
B25, in real-time processing, obtain the saturated absorption spectrum signal of current lasers state in real time, according to step B23 phase
Same feature extraction algorithm extracts feature vector, is composed and is carried out to real-time saturated absorption using the classifier after optimizing in step B24
Classification determines whether laser works in WMFTR state at this time according to classification results.
4. the laser automatic freqauency stabilization method according to claim 3 based on saturated absorption spectrum intelligent identification technology, feature exist
In in step B23, described according to feature extraction algorithm, extraction feature vector is specifically wrapped from each saturated absorption spectrum sample
It includes:
B231, the segment of different scale is extracted as template from standard saturated absorption spectrum, wherein standard saturated absorption spectrum is sharp
Light device is in the spectrum of the saturated absorption under WMFTR state；
B232, the cross-correlation sequence for calculating each template and saturated absorption to be sorted spectrum, and maximum cross-correlation information is therefrom extracted,
That is maximum value and corresponding position in the sequence；
B233, saturated absorption to be sorted spectrum and the maximum cross-correlation information of multiple dimensioned template form the feature of saturated absorption spectrum to
Amount.
5. the laser automatic freqauency stabilization method according to claim 3 based on saturated absorption spectrum intelligent identification technology, feature exist
In in step B24, the classifier is support vector machines.
6. it is a kind of based on saturated absorption spectrum intelligent identification technology laser automatic freqauency stabilization system, which is characterized in that including laser,
Laser driver, primary processor, feedback controller, frequency discriminator, low precision wavemeter；
For acquiring signal, the working condition of analysis system, the workflow of control system, frequency discriminator is used for the primary processor
The saturated absorption signal and frequency discrimination signal of atom are obtained, low precision wavelength is used for the output frequency of rough measure laser, feedback
Controller is PID controller, carries out feedback compensation for the output frequency to laser；
Program on the primary processor includes frequency-locked state discrimination module, laser output mode selecting module, saturation is inhaled in real time
Receive spectrum Intelligence Classifier module, keyed end search module, laser control module are composed in saturated absorption；
The frequency discriminator, feedback controller, feedback controller form laser closed loop locking described in any one of claim 1 to 5
Circuit；
The frequency discriminator, primary processor, laser driver, wavemeter composition laser described in any one of claim 1 to 5 are automatic
Re-lock circuit.
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| CN112260057A (en) * | 2020-09-23 | 2021-01-22 | 北京无线电计量测试研究所 | Calcium atomic beam optical frequency scale detection light automatic locking method |
| CN112864781A (en) * | 2021-01-08 | 2021-05-28 | 中国船舶重工集团公司第七0七研究所 | Communication waveband laser system and method for cold atom interferometer |
| CN113394652A (en) * | 2021-06-09 | 2021-09-14 | 西安纳飞光电科技有限公司 | Broadband large-range locking method and system for optical frequency comb repetition frequency |
| CN117374714A (en) * | 2023-12-07 | 2024-01-09 | 湖南国科通导时空科技有限公司 | Automatic frequency locking and unlocking detection method, system and medium for laser signals |
| CN118263768A (en) * | 2024-05-31 | 2024-06-28 | 中国人民解放军海军工程大学 | Automatic frequency stabilization method of semiconductor laser |
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| CN110098556A (en) * | 2019-05-17 | 2019-08-06 | 中国科学院上海技术物理研究所 | A kind of 828nm atmosphere vapour detection differential absorption lidar transmitter system |
| CN112260057A (en) * | 2020-09-23 | 2021-01-22 | 北京无线电计量测试研究所 | Calcium atomic beam optical frequency scale detection light automatic locking method |
| CN112260057B (en) * | 2020-09-23 | 2021-11-26 | 北京无线电计量测试研究所 | Calcium atomic beam optical frequency scale detection light automatic locking method |
| CN112864781A (en) * | 2021-01-08 | 2021-05-28 | 中国船舶重工集团公司第七0七研究所 | Communication waveband laser system and method for cold atom interferometer |
| CN113394652A (en) * | 2021-06-09 | 2021-09-14 | 西安纳飞光电科技有限公司 | Broadband large-range locking method and system for optical frequency comb repetition frequency |
| CN117374714A (en) * | 2023-12-07 | 2024-01-09 | 湖南国科通导时空科技有限公司 | Automatic frequency locking and unlocking detection method, system and medium for laser signals |
| CN117374714B (en) * | 2023-12-07 | 2024-03-22 | 湖南国科通导时空科技有限公司 | Automatic frequency locking and unlocking detection method, system and medium for laser signals |
| CN118263768A (en) * | 2024-05-31 | 2024-06-28 | 中国人民解放军海军工程大学 | Automatic frequency stabilization method of semiconductor laser |
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