CN110165547A - A kind of laser frequency stabilisation device and method - Google Patents
A kind of laser frequency stabilisation device and method Download PDFInfo
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- CN110165547A CN110165547A CN201910404699.0A CN201910404699A CN110165547A CN 110165547 A CN110165547 A CN 110165547A CN 201910404699 A CN201910404699 A CN 201910404699A CN 110165547 A CN110165547 A CN 110165547A
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- 230000006641 stabilisation Effects 0.000 title claims abstract description 74
- 238000000034 method Methods 0.000 title claims abstract description 24
- 230000010287 polarization Effects 0.000 claims abstract description 73
- 238000001514 detection method Methods 0.000 claims abstract description 69
- 238000011105 stabilization Methods 0.000 claims abstract description 56
- 230000003595 spectral effect Effects 0.000 claims abstract description 47
- 238000001228 spectrum Methods 0.000 claims abstract description 44
- 239000000523 sample Substances 0.000 claims abstract description 42
- 238000012545 processing Methods 0.000 claims abstract description 33
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- 229910052792 caesium Inorganic materials 0.000 description 1
- TVFDJXOCXUVLDH-UHFFFAOYSA-N caesium atom Chemical compound [Cs] TVFDJXOCXUVLDH-UHFFFAOYSA-N 0.000 description 1
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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
- H01S5/00—Semiconductor lasers
- H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
- H01S5/068—Stabilisation of laser output parameters
- H01S5/0683—Stabilisation of laser output parameters by monitoring the optical output parameters
- H01S5/0687—Stabilising the frequency of the laser
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Abstract
The present invention provides a kind of laser frequency stabilisation device and method, device includes: beam splitting unit, spectral signal unit, probe unit and feedback unit, and the laser issued by generating device of laser is converted to frequency stabilization and used up by beam splitting unit；Spectral signal unit includes: optical splitter, light modulator and deviator；Optical splitter from frequency stabilization use up in isolate pump light and the first detection light, light modulator is overlapped pump light and the first detection light to obtain sample light, and deviator deviates the left-handed rotatory polarization and dextrorotation rotatory polarization of sample light；The left-handed rotatory polarization and dextrorotation rotatory polarization of probe unit processing sample light obtain two double-colored spectrum signals；Feedback unit carries out difference processing to two double-colored spectrum signals and obtains spectral signal, and the frequency of the laser issued according to spectral signal feedback control generating device of laser, by obtaining spectral signal as difference using double-colored general technology, it can be realized by the Frequency Locking of the laser of generating device of laser output, to realize frequency stabilization.
Description
Technical field
The present invention relates to laser frequency stabilization fields, in particular to a kind of laser frequency stabilisation device and method.
Background technique
Currently, semiconductor laser has, small in size, low in energy consumption, wavelength cover is big, is easy to tuning and good list
Color and coherence are widely used in the numerous areas such as precise laser spectrum and delicate metering；But in practical applications, by
The drift of the light frequency caused by the noises such as the thermal agitation of laser diode and external mechanical vibrations is far longer than laser limit line width,
Therefore crucial is exactly that laser is stabilized on atomic transition spectral line, this just needs to carry out frequency stabilization operation to laser.
Summary of the invention
The present invention provides a kind of laser frequency stabilisation device and method, is carried out with the laser frequency issued to generating device of laser steady
Frequently.
To achieve the goals above, technical solution provided by the embodiment of the present invention is as follows:
In a first aspect, the embodiment of the present invention provides a kind of laser frequency stabilisation device, comprising: beam splitting unit, spectral signal unit,
Probe unit and feedback unit, beam splitting unit are used up for the laser issued by generating device of laser to be converted to frequency stabilization；Spectrum
Signal element includes: optical splitter, light modulator and deviator；Wherein, optical splitter is for isolating pumping in using up from the frequency stabilization
Light and the first detection light, light modulator is for being overlapped pump light and the first detection light to obtain sample light, and deviator is for deviating sample
The left-handed rotatory polarization and dextrorotation rotatory polarization of this light, probe unit be used to handle left-handed rotatory polarization and the dextrorotation rotatory polarization of sample light with
Two double-colored spectrum signals are obtained, feedback unit is used to carry out difference processing to two double-colored spectrum signals to obtain spectral signal, and
Feedback control is carried out according to frequency of the spectral signal to the laser that generating device of laser issues；Pass through the dichroic using circular polarization
Property lead to the movement of frequency, and measure the absorption spectra of different circular polarization and carry out difference processing, laser is occurred to realize
The locking of the frequency of the laser of device output, to solve the problems, such as the frequency stabilization of generating device of laser.
With reference to first aspect, in some possible implementations, optical splitter is for isolating second in using up from frequency stabilization
Detect light；Deviator is also used to deviate the left-handed rotatory polarization and dextrorotation rotatory polarization of the second detection light；Probe unit is also used to handle
The left-handed rotatory polarization and dextrorotation rotatory polarization of second detection light are to obtain two Doppler's background signals；Feedback unit is also used to two
A double-colored spectrum signal and two Doppler's background signal spectrum signals carry out difference processing to obtain spectral signal；By more using disappearing
General Le mode eliminates Doppler's background in sample light, to solve the Doppler effect in fluctuation effect, reduces power etc. and asks
Inscribe the influence to frequency stabilization bring frequency shifts etc..
With reference to first aspect, in some possible implementations, spectral signal unit further include: saturable absorber is used
In to first detection light and second detection light carry out saturated absorption processing, and will in saturated absorption state first detection light and
Second detection light is sent to deviator；Two detection light are handled by using the mode saturated absorption of internal modulation, in conjunction with double-colored
Spectral technology obtains spectral signal, can effectively eliminate Doppler's background in double-colored spectral technology frequency stabilization, eliminate power swing
Brought influence, and the signal for obtaining peak is bigger than the slope of common double-colored spectrum, and more conducively locking generating device of laser is sent out
The frequency of laser out.
With reference to first aspect, in some possible implementations, probe unit includes: polarization separator and photodetection
Device, polarization separator are inclined for separating Doppler's background signal and the respective left-handed rotatory polarization of original spectrum signal and dextrorotation circle
Light；Photodetector for converting Doppler's background signal and the respective left-handed rotatory polarization of original spectrum signal and dextrorotation circle respectively
Polarisation is electric signal；Electric signal is converted light signals into using photodetector, is convenient for the calculating such as difference processing.
With reference to first aspect, in some possible implementations, feedback unit includes: computing circuit and feedback control list
Member, computing circuit is for receiving simultaneously two double-colored spectrum signals of difference processing and/or two Doppler's background signals, to obtain spectrum
Signal, feedback control unit obtains feedback signal for handling spectral signal, and controls generating device of laser using feedback signal
The frequency of the laser of sending.
With reference to first aspect, in some possible implementations, feedback unit includes: slow feedback module；By slow
Fast feedback module such as piezoelectric ceramics etc. can change that chamber is long, reduce the band width of the laser of output.
With reference to first aspect, in some possible implementations, feedback unit includes: the electricity for handling rapid feedback
Flow control module, rapid feedback can control generating device of laser power etc. by electric signal.
Second aspect, the embodiment of the present invention also provide a kind of laser frequency stabiliz ation method, comprising: issue generating device of laser
Laser is converted to frequency stabilization and uses up；From frequency stabilization use up in isolate pump light and first detection light, be overlapped pump light and first detection
Light deviates the left-handed rotatory polarization and dextrorotation rotatory polarization of sample light to obtain sample light；Handle the left-handed rotatory polarization of sample light
With dextrorotation rotatory polarization to obtain two double-colored spectrum signals；Difference processing is carried out to two double-colored spectrum signals and obtains spectral signal, and
And the frequency of the laser issued according to spectral signal feedback control generating device of laser.
In conjunction with second aspect, in some possible implementations, method further include: from frequency stabilization use up in isolate second
Detect light；Before two double-colored spectrum signals are carried out with difference processing and obtains spectral signal, method further include: offset the second detection light
Left-handed rotatory polarization and dextrorotation rotatory polarization, processing second detection light left-handed rotatory polarization and dextrorotation rotatory polarization it is general more than two to obtain
Background signal is strangled, and difference processing is carried out to obtain light to two double-colored spectrum signals and two Doppler's background signal spectrum signals
Spectrum signal.
In conjunction with second aspect, in some possible implementations, after separation frequency stabilization is used up as to be processed use up, method
Further include: the first detection light of saturated absorption processing and the second detection light, so that the first detection light and the second detection light are in saturation
Absorbing state.
In conjunction with second aspect, in some possible implementations, according to spectral signal feedback control generating device of laser,
It include: to be handled spectral signal to obtain feedback signal, and carry out slow feedback to generating device of laser based on the feedback signal
And/or rapid feedback.
The beneficial effect comprise that
Go out a part of laser as frequency stabilization by the separation by laser issued from generating device of laser to use up, and further will
Frequency stabilization, which is used up, is divided into the first detection light and pump light, the movement of frequency is led to using the dichroism of circular polarization, and measure not
With circular polarization absorption spectra and carry out difference processing, to realize the locking of the frequency of the laser exported to generating device of laser,
To solve the problems, such as the frequency stabilization of generating device of laser.
To enable the above objects, features and advantages of the present invention to be clearer and more comprehensible, the embodiment of the present invention is hereafter enumerated, and match
Appended attached drawing is closed, is elaborated.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be to needed in the embodiment attached
Figure is briefly described, it should be understood that the following drawings illustrates only certain embodiments of the present invention, therefore is not construed as pair
The restriction of range for those of ordinary skill in the art without creative efforts, can also be according to this
A little attached drawings obtain other relevant attached drawings.
Fig. 1 is a kind of structural schematic diagram of laser frequency stabilisation device provided in an embodiment of the present invention；
Fig. 2 is a kind of structural schematic diagram of light modulator provided in an embodiment of the present invention；
Fig. 3 is a kind of operative scenario schematic diagram provided in an embodiment of the present invention；
Fig. 4 is a kind of flow diagram of laser frequency stabiliz ation method provided in an embodiment of the present invention.
Icon: 10- laser frequency stabilisation device；11- beam splitting unit；12- spectral signal unit；121- optical splitter；122- light modulation
Device；1221- reflecting mirror；1222- half-reflecting half mirror；1223- optical attenuator；123- deviator；13- probe unit；14- feedback
Member.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.The present invention being usually described and illustrated herein in the accompanying drawings is implemented
The component of example can be arranged and be designed with a variety of different configurations.
Therefore, the detailed description of the embodiment of the present invention provided in the accompanying drawings is not intended to limit below claimed
The scope of the present invention, but be merely representative of selected embodiment of the invention.Based on the embodiments of the present invention, this field is common
Technical staff's every other embodiment obtained without creative efforts belongs to the model that the present invention protects
It encloses.
It should be noted that in the absence of conflict, the feature in embodiment and embodiment in the present invention can phase
Mutually combination.
It should also be noted that similar label and letter indicate similar terms in following attached drawing, therefore, once a certain Xiang Yi
It is defined in a attached drawing, does not then need that it is further defined and explained in subsequent attached drawing.
In the description of the embodiment of the present invention, it should be noted that indicating position or positional relationship is based on shown in attached drawings
The orientation or positional relationship invention product using when the orientation or positional relationship usually put or this field
Orientation or positional relationship that technical staff usually understands or the invention product using when the orientation usually put or position close
System, is merely for convenience of description of the present invention and simplification of the description, rather than the device or element of indication or suggestion meaning must have
Specific orientation is constructed and operated in a specific orientation, therefore is not considered as limiting the invention.In addition, term " the
One ", " second ", " third " etc. are only used for distinguishing description, are not understood to indicate or imply relative importance.
The embodiment of the present invention provides a kind of laser frequency stabilisation device 10, the laser to the output of stabilized lasers generating device 20
Frequency.
Referring to FIG. 1, Fig. 1 is a kind of structural schematic diagram of laser frequency stabilisation device 10 provided in an embodiment of the present invention.Laser
Frequency regulator 10 includes: beam splitting unit 11, spectral signal unit 12, probe unit 13 and feedback unit 14, and beam splitting unit 11 is used
It is used up so that the laser issued by generating device of laser 20 is converted to frequency stabilization；Spectral signal unit 12 includes: optical splitter 121, adjusts
Light device 122 and deviator 123；Wherein, optical splitter 121 is adjusted for isolating pump light and the first detection light in using up from frequency stabilization
Light device 122 obtains sample light to be overlapped pump light and the first detection light, and deviator 123 is inclined to the left-handed circle for deviating sample light
Light and dextrorotation rotatory polarization, probe unit 13 are double-colored to obtain two to handle left-handed rotatory polarization and the dextrorotation rotatory polarization of sample light
Spectrum signal, feedback unit 14 obtains spectral signal to carry out difference processing to two double-colored spectrum signals, and is believed according to spectrum
The frequency for the laser that number feedback control generating device of laser issues.
Specifically, in embodiments of the present invention, pump light is after frequency stabilization is used up and reflected when by optical splitter 121
Laser components, the first detection light are that frequency stabilization is used up after optical splitter 121 first reflects, and in 121 rear surface of optical splitter
The laser components reflected；Specifically, in embodiments of the present invention, the deviator realizes magnetic field using hot-wire coil, from
And Zeemen effect of the laser in magnetic field is utilized, to realize the offset of left-handed rotatory polarization Yu dextrorotation rotatory polarization, in other embodiments
In, other than by the way of magnetic field, Zeemen effect, the invention is not limited in this regard can also be generated using modes such as Ne pipes.
Wherein, as known to those skilled in the art, the laser that generating device of laser issues is linearly polarized light, and linearly polarized light is equal
Two circularly polarized lights can be separated into, and then by the absorption spectra of two circularly polarized lights of measurement, and two absorption spectras progress are poor
Divide processing, so that it may the class dispersion frequency discrimination signal that reference frequency goes out is obtained, to realize the laser issued to generating device of laser
Frequency stabilization.
Optionally, in embodiments of the present invention, beam splitting unit 11 can use half-wave plate and Amici prism, specifically, swashing
After light generating apparatus 20 issues laser, laser first passes through half-wave plate so that generating the laser components of two different polarization states, then
By Amici prism, to realize that isolating frequency stabilization uses up and test light, skilled in the art realises that, it can adjust by this way
Shared ratio in the laser that generating device of laser 20 issues is used up in frequency stabilization with needs, so as in the laser that will issue
Most of laser components be used for scientific experiment, and only need fraction laser components be used as frequency stabilization；In other embodiments,
It can also equally realize the separation used up to frequency stabilization, by the way of two quarter-wave plates and an Amici prism to guarantee
It is always linearly polarized light that frequency stabilization, which is used up, the embodiment of the present invention to this with no restriction.
Specifically, in embodiments of the present invention, optical splitter 121 uses heavy sheet glass piece, so that frequency stabilization is used up by thick glass
When glass piece, the light through transmiting first is reflected again as pump light, in addition two stocks are not anti-by the forward and backward surface difference of heavy sheet glass piece
The light penetrated is as the first, second detection light；In other embodiments, optical splitter 121 can also can be completed using other
Transmission and two secondary reflections material, the embodiment of the present invention to this with no restriction.
It is further preferred that referring to FIG. 2, Fig. 2 is a kind of structural representation of light modulator 122 provided in an embodiment of the present invention
Figure.In embodiments of the present invention, light modulator 122 includes: semi-transparent semi-reflecting 1222, two pieces of reflecting mirrors 1221, wherein semi-transparent semi-reflecting
Piece 1222 is used for reflected pump light, two pieces of reflecting mirrors 1221 combine semi-transparent semi-reflecting lens 1222 be used to adjust the optical path of pump light with
First detection light is overlapped；In still other embodiments, other kinds of optical path can be used to realize the adjustment to pump light optical path,
The embodiment of the present invention to this with no restriction.
It is further preferred that in embodiments of the present invention, light modulator 122 further include: optical attenuator 1223, optical attenuator
1223 for adjusting the intensity of pump light, so as to defined ratio be obtained between pump light and the first detection light, of the invention real
It applies in example, optical attenuator 1223 is made of half-wave plate and polarization splitting prism, and is set between two pieces of reflecting mirrors 1221, is completed
Adjusting to pump light intensities in other embodiments can also be using absorbability glass etc., and the embodiment of the present invention does not make this
Limitation.
As known to those skilled in the art, for double-colored spectral technology, if keyed end is not in zero point, obtained spectrum is just
Meeting is very sensitive to the fluctuation and drift of power, and brings the drift of the laser frequency after feedback control, because the present invention is real
It applies example and uses small Doppler's background technology to eliminate Doppler's background in double-colored spectrum frequency stabilization, to eliminate the shadow of power swing
It rings.
Optionally, optical splitter 121 is also used to use up middle sub-argument from frequency stabilization and goes out the second detection light；Deviator 123 is also to inclined
Move the left-handed rotatory polarization and dextrorotation rotatory polarization of the second detection light；Probe unit 13 is also inclined to handle the left-handed circle of the second detection light
Light and dextrorotation rotatory polarization are to obtain two Doppler's background signals；Feedback unit 14 is also to two double-colored spectrum signals and two
Doppler's background signal spectrum signal carries out difference processing to obtain spectral signal；Specifically, the second detection light is that frequency stabilization is used up
When by optical splitter 121, in the laser components that 121 front surface of optical splitter reflects.
Optionally, spectral signal unit 12 further include: saturable absorber is visited to saturated absorption processing pump light, first
Light and the second detection light are surveyed, and pump light, the first detection light and the second detection light in saturated absorption state are sent to partially
Move device 123.
Specifically, in embodiments of the present invention, saturable absorber is used as using rubidium bubble, it in other embodiments, can also be with
Using caesium system saturated absorption device etc., the embodiment of the present invention to this with no restriction.
As known to those skilled in the art, atom or molecule have saturated absorption characteristic, by generating the first detection light and the
The saturated absorption peak of two detection light, two kinds of laser can be stablized in a stable frequency, and due to all fluctuations
All there is Doppler effect in phenomenon, during frequency stabilization, due to the change and above-mentioned reality of Doppler effect meeting occurrence frequency
In the problems such as diode thermal agitation, then by detecting light as Doppler's background signal, after to coincidence for first
The original spectrum signal and Doppler's background signal difference processing of pump light and the second detection light, can further decrease practical feelings
Due to the brings noise such as thermal agitation of diode in condition, the stabilization of the laser frequency issued to generating device of laser is realized.
Optionally, probe unit 13 includes: polarization separator and photodetector, and polarization separator is to separate double-colored spectrum
Signal and the respective left-handed rotatory polarization of Doppler's background signal and dextrorotation rotatory polarization；Photodetector to convert double-colored spectrum respectively
Signal and the respective left-handed rotatory polarization of Doppler's background signal and dextrorotation rotatory polarization are electric signal.
Electric signal is converted light signals into using photodetector, is convenient for the calculating such as difference processing；In other implementations
In example, delustring can also be carried out by carrying out the modes such as optical path coincidence in the case where guaranteeing polarization state, and then realize at difference
Reason, the embodiment of the present invention to this with no restriction.
Optionally, feedback unit 14 includes: slow feedback module；It can be changed by slow feedback module such as piezoelectric ceramics etc.
It is long to become chamber, reduces the band width of the laser of output.
Optionally, feedback unit 14 includes: the current control module to handle rapid feedback, and rapid feedback can pass through
Electric signal is to control generating device of laser power etc..
Specifically, in embodiments of the present invention, using piezoelectric ceramics module as slow feedback module, and using electric current control
Molding block is as rapid feedback, with finally will be on the laser frequency lock to the transition spectral line of atom of laser output.
Referring to FIG. 3, Fig. 3 is a kind of operative scenario schematic diagram provided in an embodiment of the present invention.In order to make art technology
Personnel more fully understand, the course of work of laser frequency stabilisation device 10 provided in this embodiment illustrated below: occur in laser
After device issues beam of laser to beam splitting unit 11, half-wave plate and polarization splitting prism in beam splitting unit 11 are isolated in laser
Sub-fraction used up as frequency stabilization and be sent to spectral signal unit 12；Optical splitter 121 i.e. frequency stabilization is used up be separated into pump light,
First detection light and the second detection light, wherein the second detection light is directly entered through saturable absorber, after generating saturated absorption peak
Enter probe unit 13 by half-reflecting half mirror, pump light then passes through reflecting mirror 1221, optical attenuator 1223 and half-reflecting half mirror
After 1222, it is overlapped to obtain sample light with the first detection light for generating saturated absorption peak, sample light also passes through half-reflecting half mirror
1222 enter probe unit 13；The quarter-wave plate and polarization splitting prism of probe unit 13 pass through the second detection light and sample
The left and right rounding polarisation of this light separates, to be respectively fed to four photodetectors, passes through formula:
S=(s2-s1)-(s4-s3),
Obtain spectral signal, wherein electric signal s1, electric signal s2, electric signal s3, electric signal s4Correspond respectively to sample light
Left-handed rotatory polarization and dextrorotation rotatory polarization, second detection light left-handed rotatory polarization and dextrorotation rotatory polarization；After obtaining spectral signal, instead
Feedback unit 14 obtains feedback signal by processing such as amplification, filtering, and then feedback signal is sent to slow feedback module and fastly
Fast feedback module, two generic modules realize the feedback control to generating device of laser.
It should be noted that quantity, title and the device position relationship etc. in the above citing should not become to of the invention
Limitation.
In conjunction with a kind of laser frequency stabilisation device 10 that the above embodiment of the present invention provides, a kind of laser frequency stabilization side set forth below
Method, to solve the problems, such as the frequency stabilization of the laser exported to generating device of laser.
That is, as shown in figure 4, the embodiment of the present invention also provides a kind of laser frequency stabiliz ation method, comprising:
Step S101: the laser that generating device of laser issues is converted into frequency stabilization and is used up；
Step S102: from frequency stabilization use up in isolate pump light and first detection light, be overlapped pump light and first detection light
Sample light is obtained, and deviates the left-handed rotatory polarization and dextrorotation rotatory polarization of sample light；
Step S103: left-handed rotatory polarization and the dextrorotation rotatory polarization of sample light are handled to obtain two double-colored spectrum signals；
Step S104: difference processing is carried out to two double-colored spectrum signals and obtains spectral signal, and is anti-according to spectral signal
The frequency for the laser that feedback control generating device of laser issues.
Optionally, the method also includes: from the frequency stabilization use up in isolate the second detection light；Before step S104,
Method further include: offset second detection light left-handed circle partially and dextrorotation rotatory polarization, processing second detection light left-handed rotatory polarization with
Dextrorotation rotatory polarization composes two double-colored spectrum signals and two Doppler's background signals with obtaining two Doppler's background signals
Signal carries out difference processing to obtain spectral signal.
Optionally, after the separation frequency stabilization of step S102 is used up as to be processed use up, method further include: saturated absorption processing
Pump light, the first detection light and the second detection light, so that pump light, the first detection light and the second detection light are in saturated absorption shape
State.
Optionally, the frequency packet for the laser of step S104 issued according to spectral signal feedback control generating device of laser
Include: spectral signal being handled to obtain feedback signal, and based on the feedback signal to generating device of laser carry out slow feedback or
Rapid feedback.
In addition, each functional module in each embodiment of the present invention can integrate one independent portion of formation together
Point, it is also possible to modules individualism, an independent part can also be integrated to form with two or more modules.
These are only the preferred embodiment of the present invention, is not intended to restrict the invention, for those skilled in the art
For member, the invention may be variously modified and varied.All within the spirits and principles of the present invention, it is made it is any modification,
Equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of laser frequency stabilisation device, which is characterized in that described device includes:
Beam splitting unit is used up for the laser issued by generating device of laser to be converted to frequency stabilization；
Spectral signal unit, comprising: optical splitter, light modulator and deviator；Wherein, optical splitter is in using up from the frequency stabilization points
Separate out pump light and first detection light, light modulator for be overlapped the pump light and it is described first detection light to obtain sample light,
Deviator is used to deviate the left-handed rotatory polarization and dextrorotation rotatory polarization of the sample light；
Probe unit, for handling left-handed rotatory polarization and the dextrorotation rotatory polarization of the sample light to obtain two double-colored spectrum signals；
And
Feedback unit obtains spectral signal for carrying out difference processing to described two double-colored spectrum signals, and according to the light
The frequency for the laser that spectrum signal issues the generating device of laser carries out feedback control.
2. laser frequency stabilisation device according to claim 1, which is characterized in that the optical splitter is also used to use from the frequency stabilization
The second detection light is isolated in light；
The deviator is also used to deviate the left-handed rotatory polarization and dextrorotation rotatory polarization of the second detection light；
The left-handed rotatory polarization and dextrorotation rotatory polarization that the probe unit is also used to handle the second detection light are to obtain more than two
General Le background signal；
The feedback unit is also used to carry out described two double-colored spectrum signals and described two Doppler's background signal spectrum signals
Difference processing is to obtain spectral signal.
3. laser frequency stabilisation device according to claim 1 or 2, which is characterized in that the spectral signal unit further include: full
And absorber, for carrying out saturated absorption processing to the first detection light and the second detection light, and will be inhaled in saturation
The first detection light and the second detection light of receipts state are sent to the deviator.
4. laser frequency stabilisation device according to any one of claim 1-3, which is characterized in that the feedback unit includes:
Computing circuit, for receive and to described two double-colored spectrum signals and/or at least two Doppler's background signals into
Row difference processing, to obtain spectral signal；And
Feedback control unit obtains feedback signal for handling the spectral signal, and using described in feedback signal control
The frequency for the laser that generating device of laser issues.
5. laser frequency stabilisation device described in any one of -4 according to claim 1, which is characterized in that the feedback unit includes:
Slow feedback module.
6. laser frequency stabilisation device according to any one of claims 1-5, which is characterized in that the feedback unit includes:
For handling the current control module of rapid feedback.
7. a kind of laser frequency stabiliz ation method, which is characterized in that the described method includes:
The laser that generating device of laser issues is converted to frequency stabilization to use up；
From the frequency stabilization use up in isolate pump light and first detection light, be overlapped the pump light and it is described first detection light with
Sample light is obtained, and deviates the left-handed rotatory polarization and dextrorotation rotatory polarization of the sample light；
Left-handed rotatory polarization and the dextrorotation rotatory polarization of the sample light are handled to obtain two double-colored spectrum signals；
Difference processing is carried out to described two double-colored spectrum signals and obtains spectral signal, and according to the spectral signal feedback control
The frequency for the laser that the generating device of laser issues.
8. laser frequency stabiliz ation method according to claim 7, which is characterized in that the method also includes: it is used from the frequency stabilization
The second detection light is isolated in light；
Described two double-colored spectrum signals are carried out before difference processings obtain spectral signal described, the method also includes: offset
The left-handed rotatory polarization and dextrorotation rotatory polarization of the second detection light handle the left-handed rotatory polarization and dextrorotation circle of the second detection light
Polarisation is to obtain two Doppler's background signals, and to described two double-colored spectrum signals and described two Doppler's background signals
Spectrum signal carries out difference processing to obtain spectral signal.
9. laser frequency stabiliz ation method according to claim 7 or 8, which is characterized in that the separation frequency stabilization use up for
It is to be processed use up after, the method also includes:
Saturated absorption processing is carried out to the first detection light and the second detection light, so that the first detection light and described
Second detection light is in saturated absorption state.
10. the laser frequency stabiliz ation method according to any one of claim 7-9, which is characterized in that described according to the spectrum
The frequency for the laser that generating device of laser described in signal feedback control issues, comprising:
Handled to obtain feedback signal to the spectral signal, and according to the feedback signal to the generating device of laser into
Row slow feedback and/or rapid feedback.
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