CN107024276A - A kind of device and method for eliminating remaining circular component in the detection of linearly polarized light swing angle - Google Patents
A kind of device and method for eliminating remaining circular component in the detection of linearly polarized light swing angle Download PDFInfo
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- CN107024276A CN107024276A CN201710306796.7A CN201710306796A CN107024276A CN 107024276 A CN107024276 A CN 107024276A CN 201710306796 A CN201710306796 A CN 201710306796A CN 107024276 A CN107024276 A CN 107024276A
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- 238000001514 detection method Methods 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims abstract description 20
- 229910052783 alkali metal Inorganic materials 0.000 claims abstract description 31
- 150000001340 alkali metals Chemical group 0.000 claims abstract description 31
- 230000010287 polarization Effects 0.000 claims abstract description 28
- 230000003287 optical effect Effects 0.000 claims description 9
- 230000003019 stabilising effect Effects 0.000 claims description 7
- 238000005086 pumping Methods 0.000 claims description 6
- 230000008030 elimination Effects 0.000 claims description 3
- 238000003379 elimination reaction Methods 0.000 claims description 3
- 239000008186 active pharmaceutical agent Substances 0.000 claims 1
- 230000005540 biological transmission Effects 0.000 claims 1
- 230000009897 systematic effect Effects 0.000 claims 1
- 238000005259 measurement Methods 0.000 abstract description 6
- 239000004606 Fillers/Extenders Substances 0.000 description 6
- 230000008033 biological extinction Effects 0.000 description 6
- 239000013078 crystal Substances 0.000 description 3
- 230000005697 Pockels effect Effects 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 239000004973 liquid crystal related substance Substances 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 241000208340 Araliaceae Species 0.000 description 1
- 229910021532 Calcite Inorganic materials 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 229910052701 rubidium Inorganic materials 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J4/00—Measuring polarisation of light
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J4/00—Measuring polarisation of light
- G01J4/04—Polarimeters using electric detection means
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The invention discloses a kind of device and method for eliminating remaining circular component in the detection of linearly polarized light swing angle, the device and method is based on photoelastic polarization Modulation, light polarization compensation technique and digital servo-control amplifying technique, the first harmonic component that Polarization Modulation detects output signal is obtained by photodetector and lock-in amplifier, using alkali metal atom to the response characteristic perpendicular to detection light direction magnetic field, the Axis Azimuth angle for fine-tuning quarter-wave plate accurately compensates the polarization error signal that thus light polarization brings to eliminate, compensation process can in real time be monitored by digital oscilloscope.The present invention is not applied only to the high-precision signal detection of highly sensitive atom magnetic field/inertia, and is also applied for high-precision faint light swing angle measurement aspect.
Description
Technical field
The present invention relates to light polarization measurement and the technical field of error compensation, more particularly to high-precision atomic spin magnetic field and
The technical field of inertia measurement, it is more particularly to a kind of to eliminate the device of remaining circular component and side in the detection of linearly polarized light swing angle
Method.
Background technology
The detection of linearly polarized light swing angle has wide in fields such as atomic spin signal detection, biological detection, fast spectrum imagings
General application.Atomic spin signal detection field particularly of the present invention, linearly polarized light swing angle detection has higher inspection
Survey sensitivity and precision is applied to basic physicses parameter measuring apparatus, Exceedingly feeble magnetic field measurement apparatus and the long endurance of high accuracy
Atom inertial navigation system.And the detection error that remaining circular component is introduced in linear polarization detection greatly destroys light swing angle
The sensitivity of measurement and precision, it is therefore desirable to a kind of high-precision, easy-operating device and method for eliminating this mushing error.
In prior art [1] (J.M.Brown, A New Limit on Lorentz-and CPT-Violating
Neutron Spin Interactions Using a K-3He Comagnetometer,in Department of
Physics, Princeton University, Princeton, 2011) refer to using super thick quartz glass stress variation or
The method that the Pockels effect of person's electro-optic crystal suppresses remaining circularly polarized light component.The former is by passive control in both approaches
Remaining circular component in the stress variation compensation light beam of quartz glass, its control accuracy is not high and complex operation；The latter utilizes
The Pockels effect compensation circular component of electro-optic crystal, compensation precision is limited to the polarization characteristic of electro-optic crystal and electric light is brilliant
The alternation driving electric field that body needs can produce magnetic interference influence normal signal measurement.
The content of the invention
Present invention aims at propose the device of remaining circular component and side in a kind of elimination linearly polarized light swing angle detection
Method, overcomes above-mentioned the deficiencies in the prior art.The device simple structure is compact, it is only necessary to use accurate rotatable true four points of zero level
One of wave plate, it is simple to operate；The response output interacted using detection light and alkali metal atom is as adjusting means
Feedback signal, compensation is accurate and accurate high.
To reach above-mentioned purpose, the technical solution adopted by the present invention is as follows：
A kind of device for eliminating remaining circular component in the detection of linearly polarized light swing angle, the device is detected including collimator and extender
Lasing light emitter, light power stabilising module, the polarizer, light ball modulator, variable quarter-wave plate, wedge component, alkali metal to be measured
Air chamber sample, three dimensional coils, analyzer, photodetector, photoelastic controller, digital lock-in amplifier, digital oscilloscope and letter
Number collection and processing unit, wherein, the light beam direction of advance that lasing light emitter outgoing is detected along described collimator and extender is light work(successively
Rate stable module, the polarizer, light ball modulator, variable quarter-wave plate, wedge component, alkali metal air chamber sample to be measured, three
Tie up coil, analyzer and photodetector, the control end that described photoelastic controller passes through serial ports and described light ball modulator
It is connected, the reference signal input of the digital lock-in amplifier described in the described output termination of photoelastic controller first is described
The signal input part of digital lock-in amplifier described in the output termination of photodetector, through described digital lock-in amplifier solution
The first harmonic signal output part of tune connects digital oscilloscope and Signal acquiring and processing unit respectively by threeway BNC adapters,
The output signal for being used to gather digital lock-in amplifier of the Signal acquiring and processing unit, feedback control procedures are used to stablize light
Changed power.
The described polarizer is the Glan-Taylor prism of High Extinction Ratio, and its vibrating shaft is along the x-axis direction；Light ball modulator shakes
Dynamic direction is with the polarizer in 45 degree of angles；Variable quarter-wave plate is the true zero level device of single-point wavelength, its phase retardation
It is coaxial with polarizer polarization direction；Analyzer is that its vibrating shaft of the Glan-Taylor prism of High Extinction Ratio and the polarizer direction that shakes thoroughly are hung down
Directly；Wedge component is used to adjust the light-beam position for inciding ball-type alkali metal air chamber central axis；Three dimensional coils are to alkali metal gas
Room sample provides different azimuth magnetic field.
Described photoelastic controller sets peak retardation, modulating frequency and the work of light ball modulator by TIP
Wavelength.
Removed using the described device for eliminating remaining circular component in the detection of linearly polarized light swing angle remaining in linear polarization
The method of circular component, this method comprises the following steps：
1. it will detect that the corresponding true variable quarter-wave plate of zero level of optical wavelength is arranged on the rotatable optics of high-resolution
In mirror holder, the rotation of variable quarter-wave plate can be controlled by high-accuracy rotation mirror holder controller；
2. described photoelastic controller by input front panel set the peak phase retardation of light ball modulator as
0.09rad, described photodetectors register is from the light beam light intensity of analyzer outgoing and is converted into electric signal, the electric signal output
To the signal input part of described digital lock-in amplifier, described photoelastic controller output end and the ginseng of digital lock-in amplifier
Examine signal input part to be connected, the output signal of digital lock-in amplifier includes first harmonic component and second harmonic component, wherein
Digital lock-in amplifier first harmonic output signal is delivered to digital oscilloscope by BNC connecting lines；
3. the changes of magnetic field of the three dimensional coils of alkali metal air chamber periphery is controlled using high-accuracy current source；
4. when alkali metal atom is not polarized in air chamber, the first harmonic component V of digital lock-in amplifier output signal1f
Output is represented by：
V1f∝smRm
Wherein, smFor beam polarization degree, s during pure linearly polarized lightm=0, s when pure circle is polarizedm=1, generally somewhere between
Between the two；RmIt is detection light to atom pumping rate, V when there is circularly polarized light pumping interference in linear polarization detection light1f∝smRm≠
0；Sinusoidal signal in the range of polarization alkali metal atom response frequency is applied to three dimensional coils by high-accuracy current source, in numeral
The output of lock-in amplifier first harmonic component response is observed on oscillograph.By high-accuracy rotation mirror holder controller in a small range
The optical axis position of variable quarter-wave plate before accurate adjustment air chamber, accurate compensation circularly polarized light component so that V1f∝smRm=0, disappear
Except the first harmonic error signal because of circular component introducing remaining in linear polarization detection light.
The technique effect of the present invention is as follows：
When alkali metal atom is not polarized, according to response signal of the alkali metal atom to detection light, accurately adjust variable
The Axis Azimuth angle of quarter-wave plate, using based on the variable quarter-wave plate in photoelastic modulation Polarization Detection component, no
Newly-increased device is needed, device is simple, compact conformation, easily operation.Only need to a lock-in amplifier and digital oscilloscope, signal
Processing is simple, easy to operate.
Brief description of the drawings
Fig. 1 implements structured flowchart for the device that the present invention eliminates remaining circular component in the detection of linearly polarized light swing angle；
Fig. 2 is methods ＆＆ steps of implementation flow chart of the present invention；
Reference implication is in figure：1 is that collimator and extender detects lasing light emitter, and 2 be light power stabilising module, and 3 be the polarizer,
4 be light ball modulator, and 5 be variable quarter-wave plate, and 6 be wedge component, and 7 be alkali metal air chamber sample to be measured, and 8 be three-dimensional line
Circle, 9 be analyzer, and 10 be photodetector.
Embodiment
Below in conjunction with the accompanying drawings and embodiment further illustrates the present invention.
Fig. 1 implements structured flowchart for the device that the present invention eliminates remaining circular component in the detection of linearly polarized light swing angle.By
Figure is visible, and the present invention eliminates the device of remaining circular component in the detection of linearly polarized light swing angle by detecting lasing light emitter by collimator and extender
1st, light power stabilising module 2, the polarizer 3, light ball modulator 4, variable quarter-wave plate 5, wedge component 6, alkali metal to be measured
Air chamber sample 7, three dimensional coils 8, analyzer 9, photodetector 10 and photoelastic controller, high-accuracy rotation mirror holder controller, lock
Phase amplifier and digital oscilloscope are constituted, and its position relationship is：
Light beam direction of advance along the described collimator and extender detection outgoing of lasing light emitter 1 is light power stabilising module 2 successively, risen
Inclined device 3, light ball modulator 4, variable quarter-wave plate 5, wedge component 6, alkali metal air chamber sample 7 to be measured, three dimensional coils 8,
Analyzer 9 and photodetector 10.Described variable quarter-wave plate 5 is installed in the mirror that high-accuracy rotation can be automatically controlled
In frame；Described photoelastic controller is connected by serial ports with the control end of described light ball modulator 4, described light ball modulator
The reference signal input of digital lock-in amplifier described in 4 first output terminations, the output end of described photodetector 10
The signal input part of described digital lock-in amplifier is connect, described digital lock-in amplifier first harmonic signal output part passes through
Threeway BNC adapters connect digital oscilloscope and NI Signal acquiring and processing units, the use of the Signal acquiring and processing unit respectively
In the output signal of collection digital lock-in amplifier, feedback control procedures are used to stablize optical power change.
The described polarizer 3 is the Glan-Taylor prism of High Extinction Ratio, and its vibrating shaft is along the x-axis direction；Light ball modulator
Direction of vibration is with the polarizer in 45 degree of angles；Variable quarter-wave plate 5 is the true zero level device of single-point wavelength, its fast axis direction
Angle and the polarization direction of the polarizer 3 are coaxial；Analyzer 9 is that its vibrating shaft of the Glan-Taylor prism of High Extinction Ratio shakes thoroughly with the polarizer 3
Direction is vertical；Alkali metal air chamber sample 7 to be measured is ball-type alkali metal air chamber, and wedge component 6 incides ball-type alkali gold for regulation
Belong to the light-beam position of air chamber central axis；Three dimensional coils provide not Tongfang by high-accuracy current source to alkali metal air chamber sample 7
The magnetic field of position.
The structure chart of highly preferred embodiment of the present invention is as shown in figure 1, its concrete structure is as follows：Described collimator and extender detection
Lasing light emitter 1 is wavelength 795nm DFB semiconductor laser, and described light power stabilising module 2 is that liquid crystal noise muffler coordinates
The control assembly of polarization splitting prism, forms to the stability contorting of luminous power in light path to avoid its power swing from flooding to be canceled
Polarization error signal；The described polarizer 3 is that Glan Taylor devating prism its extinction ratio that calcite is made is better than 10-5；Institute
The light ball modulator 4 stated is the PEM100 light ball modulators for the resonant frequency 50KHz that Hinds Instruments companies develop；
Described wedge component 6 is made up of the K9 glass of 45 ° of angles of wedge；Described alkali metal air chamber sample 7 is by certain proportion K, Rb alkali
The inert gas of metallic atom mixture and certain air pressure21Ne is constituted；Described three dimensional coils 8 are helmholtz coil；It is described
Analyzer 9 for extinction ratio be better than 10-5Glan-Taylor prism；Described photodetector 10 is by photodiode and preceding storing
Big circuit is constituted；Described photoelastic controller and the supporting vibration for being used for driving light ball modulator 4 of light ball modulator 4；The number
The HF2LI lock-in amplifiers that word lock-in amplifier is developed by ZI companies of Switzerland.
Eliminate residual in linearly polarized light using the described device for eliminating remaining circular component in the detection of linearly polarized light swing angle
The method of remaining circular polarization component, comprises the following steps：
1. it will detect that the corresponding true zero level quarter-wave plate of optical wavelength is arranged on the rotatable optical bracket of high-resolution
It is interior, the rotation of quarter-wave plate can be controlled by high-accuracy rotation mirror holder controller；
2. described photoelastic controller by input front panel set the peak phase retardation of light ball modulator 4 as
0.09rad, described photodetector 10 records the light beam light intensity from the outgoing of analyzer 9 and is converted into electric signal, the electric signal
Export to the signal input part of described digital lock-in amplifier, described photoelastic controller output end and digital lock-in amplifier
Reference signal input be connected, the output signal of digital lock-in amplifier includes first harmonic component and second harmonic component,
Wherein digital lock-in amplifier first harmonic output signal is delivered to digital oscilloscope by BNC connecting lines；
3. the changes of magnetic field of the three dimensional coils of the periphery of alkali metal air chamber sample 7 is controlled using high-accuracy current source；
4. when alkali metal atom is not polarized in air chamber, the first harmonic component V of digital lock-in amplifier output signal1f
Expression formula is：
V1f∝smRm
Wherein, smFor beam polarization degree, s during pure linearly polarized lightm=0, s when pure circle is polarizedm=1, generally somewhere between
Between the two；RmIt is detection light to atom pumping rate, V when there is circularly polarized light pumping interference in linear polarization detection light1f∝smRm≠
0；Sinusoidal signal in the range of polarization alkali metal atom response frequency is applied to three dimensional coils 8 by high-accuracy current source, in number
The output of lock-in amplifier first harmonic component response is observed on word oscillograph.By high-accuracy rotation mirror holder controller in small range
The optical axis position of variable quarter-wave plate 5 before interior accurate adjustment air chamber, accurate compensation circularly polarized light component so that V1f∝smRm=0,
Eliminate because of the first harmonic error signal that circular component remaining in linear polarization detection light is introduced.
The operation principle of the present invention is as follows：
The atomic spin of alkali metal air chamber not by pumping polarization or atomic spin relaxation when, now alkali metal atom assemblage
Magnetic field is not responded to external world for spin；But because circular component remaining in linear polarization detection light has one to magnetic field
The disturbance response in (the modulation magnetic field that the three dimensional coils 8 that the present invention is mentioned give), accurately adjusts the side of variable quarter-wave plate 5
Parallactic angle finds that this interference signal has the response output of zero passage, and the azimuth of the corresponding variable quarter-wave plate 5 of its zero point is just
It is the corresponding optimum position of elimination circular component in linear polarization detection light, now position is locked using precision adjustment mirror holder.
The variable quarter-wave plate 5 of precision rotation in the present invention can be replaced with liquid crystal phase retardation device, equally can be real
Now eliminate the purpose of remaining circular component in linearly polarized light.
The content not being described in detail in description of the invention belongs to prior art known to professional and technical personnel in the field.
Claims (3)
1. a kind of device for eliminating remaining circular component in the detection of linearly polarized light swing angle, it is characterised in that：The device includes standard
DS beam detection lasing light emitter (1), light power stabilising module (2), the polarizer (3), light ball modulator (4), variable quarter-wave
Piece (5), wedge component (6), alkali metal air chamber sample (7) to be measured, three dimensional coils (8), analyzer (9), photodetector (10),
Photoelastic controller, digital lock-in amplifier, digital oscilloscope and Signal acquiring and processing unit；Wherein, expand along described collimation
The light beam direction of advance of beam detection lasing light emitter (1) outgoing is light power stabilising module (2), the polarizer (3), light ball modulator successively
(4), variable quarter-wave plate (5), wedge component (6), alkali metal air chamber sample (7) to be measured, three dimensional coils (8), analyzer
And photodetector (10) (9)；Photoelastic controller is connected by serial ports with described light ball modulator (4) control end, described
The photoelastic output end of controller first connects the reference signal input of digital lock-in amplifier, described photodetector (10)
The signal input part of the described digital lock-in amplifier of output end connection, through the once humorous of described digital lock-in amplifier demodulation
Ripple signal output part meets digital oscilloscope and Signal acquiring and processing unit, the signal acquisition and place by threeway BNC adapters
The data acquisition program of reason unit is used for the signal for gathering digital lock-in amplifier output, and its feedback control procedures is used to stablize light
Road optical power change.
2. the device according to claim 1 for eliminating remaining circular component in the detection of linearly polarized light swing angle, its feature exists
In：The polarizer (3) light transmission shaft is along the x-axis direction；The direction of vibration of light ball modulator (4) is with the polarizer in 45 degree of angles；Variable four
/ mono- wave plate (5) is the true zero level device of single-point wavelength, and its fast axle and the polarizer (3) direction that shakes thoroughly are coaxial；Analyzer (9)
Vibrating shaft is vertical with the polarizer (3)；Alkali metal air chamber sample (7) to be measured is ball-type alkali metal air chamber, and wedge component (6) is used to adjust
Section incides the light-beam position of ball-type alkali metal air chamber central axis；Three dimensional coils (8) are carried to alkali metal air chamber sample (7) to be measured
For the magnetic field of different azimuth.
3. a kind of method for eliminating remaining circular component in the detection of linearly polarized light swing angle, utilizes the elimination described in claim 1
The device of remaining circular component in the detection of linearly polarized light swing angle, it is characterised in that：This method comprises the following steps：
1. variable quarter-wave plate (5) is installed in high-resolution rotatable optical bracket, passes through high-precision controller
Control it to rotate；Three dimensional coils (8) are driven by precision signal generator；
2. described photoelastic controller sets the peak phase retardation of light ball modulator (4) as 0.09rad by front panel, institute
The photodetector (10) stated records the light beam light intensity from analyzer (9) outgoing and is converted into electric signal, and the electric signal output is extremely
The signal input part of described digital lock-in amplifier, the reference of described photoelastic controller output end and digital lock-in amplifier
Signal input part is connected, and the output signal of digital lock-in amplifier includes first harmonic component and second harmonic component, wherein counting
Word lock-in amplifier first harmonic output signal is delivered to digital oscilloscope by BNC connecting lines；
3. when alkali metal air chamber sample (7) to be measured is not polarized, the first harmonic component of digital lock-in amplifier output signal
V1fFor systematic error signal, its expression formula is：
V1f∝smRm
Wherein, smFor beam polarization degree, s during pure linearly polarized lightm=0, s when pure circle is polarizedm=1, generally somewhere between both
Between；RmFor pumping rate of the detection light to alkali metal atom；V when there is circular component in linear polarization detection light1f∝smRm≠ 0,
Three dimensional coils (8) are applied with the sinusoidal signal in the range of its response frequency, the lock-in amplifier observed on digital oscilloscope is once
Harmonic component response output；A small range fine-tunes the optical axis position of variable quarter-wave plate (5) before air chamber, and compensation circle is inclined
Light component shake so that V1f∝smRm=0, eliminate the error signal of now first harmonic.
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| CN201710306796.7A CN107024276B (en) | 2017-04-27 | 2017-04-27 | A kind of device and method for eliminating remaining circular component in the detection of linearly polarized light swing angle |
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| CN201710306796.7A CN107024276B (en) | 2017-04-27 | 2017-04-27 | A kind of device and method for eliminating remaining circular component in the detection of linearly polarized light swing angle |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107643615A (en) * | 2017-09-30 | 2018-01-30 | 北京航空航天大学 | A kind of full light path stabilized intensity control system of SERF atomic spins gyro |
| CN109781317A (en) * | 2019-03-11 | 2019-05-21 | 山东大学 | Optical glass stress detection system and detection method |
| CN109889252A (en) * | 2019-02-18 | 2019-06-14 | 中国科学院上海光学精密机械研究所 | Space laser communications system |
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