CN115629345A - Detection light pumping effect inhibition method based on beam opposite radiation cancellation - Google Patents
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Abstract
A method for suppressing the pumping effect of detection light based on the cancellation of light beam correlation uses SERF (spin exchange relaxation free) inertial measurement system as research object, and locates the residual error after the light intensity is stabilized in the non-ideal linear polarization of the detection light. By selecting a high-transmittance low-reflection lens with proper transmittance and adjusting the angle of the 1/8 wave plate, the detection light pumping effect caused by non-ideal linear polarization can be inhibited under the condition that the main working point condition of the atomic spin inertia measuring device is not changed and the scale factor is not reduced basically, and the method has important significance for improving the system stability.
Description
Technical Field
The invention relates to a detection light pumping effect inhibition method based on beam pair emission cancellation, belongs to the field of atomic inertia measurement systems, and can also be used in the field of atomic magnetometers.
Background
With the rapid development of modern physics, from the successful capture of cold atoms, new discoveries and breakthroughs of key physical basic theories and technologies such as bose-einstein condensation, quantum coherent optical theory, measurement and control of a single quantum system and the like enable quantum scientific instruments based on quantum regulation theories and technologies to be rapidly developed. At present, in the field of high-precision inertial navigation, an atomic Spin inertial measurement system based on Spin-Exchange Relaxation-Free (SERF) technology has attracted wide attention at home and abroad because of its ultrahigh theoretical precision exceeding the existing relevant measurement means. The SERF atomic spin inertia measurement device adopts an external structure that pumping light and detection light are orthogonal. The inner core is a mixture of an alkali metal and an inert gas. The high stability of the electron spin and nuclear spin states determines the performance of the SERF inertial measurement system. In order to ensure high accuracy and high precision of the atomic spin inertia measurement system, measurement errors caused by detection of optical pumping effect on the device need to be eliminated, and the precision and the sensitivity of the inertia measurement system are improved.
At present, methods for detecting the optical pumping effect mainly comprise methods for compensating crystal deformation and quarter-wave plate compensation through stress, and the like, wherein the first method increases the number of devices and is not beneficial to miniaturization; although the second method reduces the background noise and the volume of the compensation module, the above two types of compensation are not quantitatively evaluated, and are based on reducing the detection light power, which is not beneficial to improving the long-term stability.
In conclusion, with the development and popularization of atomic spin magnetic field and inertial measurement technology, it is necessary to suppress the pumping effect of the detection light, and practical research in this aspect is still relatively lacking. The method mainly researches and detects the measuring method of the optical pumping effect and inhibits the pumping effect caused by non-ideal linear polarization under the condition of not changing the main working point condition of the atomic spin inertia measuring device and not reducing the scale coefficient basically, and has important significance for improving the system stability.
Disclosure of Invention
The invention solves the problems that: the method is used for inhibiting the pumping effect caused by non-ideal linear polarization in real time under the condition that the main working point condition of the atomic spin inertia measurement device is not changed and the scale factor is not basically reduced, so as to improve the stability of the SERF inertia measurement system.
The technical solution of the invention is as follows:
a method for suppressing the pumping effect of detection light based on the destructive radiation of light beams is characterized by comprising the following steps:
step 1, heating an alkali metal air chamber of an SERF inertia measurement system to a working temperature, compensating a magnetic field by adopting a magnetic field cross modulation compensation technology when an atom is polarized to a stable state by laser, working the inertia measurement system at an inertia measurement system compensation point, and testing and recording a stable state bias signal V of the inertia measurement system out The rotation inertia measurement system obtains a scale coefficient K of the spin inertia measurement device;
step 4, judging the suppression effect of the detection light pumping effect by comparing the linear relation slope KI of the 1/8 wave plate at different angles;
and 5, finally obtaining a 1/8 wave plate angle value almost enabling KI =0, enabling the inertia measurement system to work at a wave plate angle of 'detection optical pumping effect zero point', and enabling the inertia measurement system to output stable state output with little interference of detection optical pumping effect.
The detection light pumping effect is a component of residual errors after the detection light has stable light intensity, and the residual optical rotation angle generated by the depolarization of the spherical air chamber and the dichroism absorption of the gas circle is compensated through the 1/8 wave plate, so that the stable output of the inertia measurement system is not interfered by the detection light pumping effect any more.
The suppression device adjusts part of emergent detection light and injects the part of emergent detection light into the air chamber again through a method for suppressing the detection light pumping effect based on optical path correlation cancellation, so that the forward detection light pumping effect is counteracted, and the detection light pumping effect caused by non-ideal linear polarization can be suppressed under the condition that the main working point condition of the atomic spin inertia measuring device is not changed and the scale coefficient is not reduced basically by selecting the transmissivity of the high-transmittance low-reflectivity lens and adjusting the angle of the 1/8 wave plate.
The detection light is emitted from the detection laser, sequentially passes through a first polarizer, a detection liquid crystal module, a first analyzer, a first reflector, a first half-wave plate, a Glan Taylor prism, a first quarter-wave plate, an air chamber, a 1/8 wave plate, a high-transmittance low-reflectance lens and a second half-wave plate and then reaches a first polarization beam splitter prism, the first polarization beam splitter prism is respectively connected with a second photoelectric detector and a third photoelectric detector, the second photoelectric detector and the third photoelectric detector are both connected with the output end of an SERF inertia measurement system, the Glan Taylor prism is connected with the detection liquid crystal module through the first photoelectric detector and a first electric control module in sequence, and an oven, a three-dimensional magnetic field coil and a magnetic shielding structure are arranged on the periphery of the air chamber.
Spin inertia measuring device includes the pumping laser instrument, the pumping light sequence that the pumping laser instrument launched passes through the air chamber behind first lens, second lens, the second mirror, the second polarizer, pumping light path liquid crystal module, second analyzer, third half-wave plate and combination prism, combination prism loops through fourth photoelectric detector and the automatically controlled module of second and connects pumping light path liquid crystal module.
Obtaining steady-state bias signals of the inertia measurement system under different detection optical powers through recording, obtaining scale coefficients K of the inertia measurement system through rotation, and obtaining optical frequency shift L of the inertia measurement system through amplitude-frequency response and step modulation experiments z Electron relaxation rate of
Obtaining the electronic polarizability by measuring the slowing factor
Thereby obtaining R at the detected optical power m s m Fitting is carried out by changing the detection light power, and R is finally obtained m s m Linear with detected optical power.
R m s m Slope K of linear relationship with detected optical power I The smaller the pumping effect indicating the detection light.
The invention has the following technical effects: the invention discloses a detection light pumping effect inhibition method based on light beam opposite radiation cancellation, which takes an SERF (spin exchange relaxation free) inertia measurement system as a research object, positions the residual error after the light intensity is stabilized by detection light onto the non-ideal linear polarization of the detection light, and provides a method for inhibiting the detection light pumping effect based on light path opposite radiation cancellation through the newly-proposed detection light pumping effect measurement method. By selecting a high-transmittance low-reflection lens with proper transmittance and adjusting the angle of the 1/8 wave plate, the detection light pumping effect caused by non-ideal linear polarization can be inhibited under the condition that the main working point condition of the atomic spin inertia measuring device is not changed and the scale factor is not reduced basically, and the method has important significance for improving the system stability.
Compared with the prior art, the invention has the advantages that: the method is used for inhibiting the pumping effect caused by non-ideal linear polarization in real time under the condition of not changing the main working point condition of the atomic spin inertia measuring device and basically not reducing the scale factor, inhibiting the detection light pumping effect to the minimum, effectively inhibiting the fluctuation of the residual rotation angle, improving the stability and the sensitivity of a system and simultaneously improving the measurement precision of rotation.
Drawings
FIG. 1 is a schematic flow chart of a method for suppressing the pumping effect of detection light based on the cancellation of the beam pair emission according to the present invention. Fig. 1 includes step 1, starting the atomic spin inertia measurement apparatus, when the apparatus works at a "top compensation point" (i.e. the inertia measurement system works at an "inertia measurement system compensation point"), testing and recording a top steady-state bias signal Vout (i.e. the inertia measurement system steady-state bias signal Vout), and rotating to obtain a scale coefficient K of the top (i.e. the rotation inertia measurement system obtains the scale coefficient K of the spin inertia measurement apparatus); step 2, obtaining the electronic polarizability by a slow factor method
Obtaining Bc (environmental residual magnetism), lz (Z axis) and Bc (environmental residual magnetism) by using amplitude-frequency response experiments and step modulation experiments,
(electron relaxation rate) and Lx (X-axis optical frequency shift), and Rmsm (Rm is pumping speed of detection light, s) m Is the degree of circular polarization of the detected light), an estimate of the pumping effect of the detected light at that time is obtained; step 3, changing the angle of a 1/8 wave plate in the designed suppression light path, and repeatedly performing the operation to obtain a new linear relation; step 4, linear relation slope K is compared at each angle I Determining the suppression effect of the pumping effect of the detection light; step 5, finally obtaining the product almost made of K I The value of the wave plate angle is not less than 0, so that the gyroscope works at the wave plate angle of the detection optical pumping effect zero point, and the interference of the detection optical pumping effect on the steady-state output of the gyroscope is small.
Fig. 2 is a schematic diagram of an experimental system of a method for suppressing a detection optical pumping effect based on beam pair cancellation according to the present invention.
The reference numbers are listed below: 1-detection laser; 2-first polarizer (detection liquid crystal module polarizer); 3-detecting the liquid crystal module; 4-first analyzer (detecting liquid crystal module analyzer); 5-first mirror (detection optical path mirror); 6-first half wave plate (half wave plate before the detection light path enters the air chamber); 7-Glan Taylor prism; 8-a first quarter wave plate (detection path quarter wave plate); 9-a first electronic control module (detection light path electronic control module); 10-a first photodetector (detection light path photodetector); 11-magnetic shielding structure/three-dimensional magnetic field coil (three-dimensional magnetic field coil is arranged in the magnetic shielding structure); 12-an oven; 13-air chamber; 14-eighth wave plate (1/8 wave plate); 15-different transmittance inverse ratio spectroscope (high transmittance low reflectance lens); 16-a second half-wave plate (a rear half-wave plate of the detection optical path air outlet chamber); 17-a first polarization beam splitter prism (detection light path polarization beam splitter prism); 18-second photodetector (photodetector 1 of the differential detection module); 19-a third photodetector (photodetector 2 of the differential detection module); 20-SERF inertial measurement system output end; 21-pump laser; 22-first lens (beam expanding lens group lens 1); 23-second lens (expander lens group lens 2); 24-second mirror (pumping path mirror); 25-second polarizer (pump light path liquid crystal module polarizer); 26-pump optical path liquid crystal module; 27-second analyzer (pump light path liquid crystal module analyzer); 28-a third half-wave plate (pump path half-wave plate); 29-combined prism (formed by gluing a polarization beam splitter prism and a quarter wave plate, wherein the quarter wave plate faces to the air chamber); 30-a fourth photodetector (pump path photodetector); 31-second electronic control module (pumping light path electronic control module, ECU).
Detailed Description
The invention is explained below with reference to the figures (fig. 1-2) and examples.
Fig. 1 is a schematic flow chart of a method for suppressing the pumping effect of detection light based on the cancellation of the emission of light beams according to the present invention. Fig. 2 is a schematic diagram of an experimental system of a method for suppressing a pumping effect of detection light based on destructive radiation of light beams according to the present invention. Referring to fig. 1 to 2, a method for suppressing an optical pumping effect based on beam pair cancellation includes the following steps: step 1, heating an alkali metal gas chamber of an SERF inertia measurement system to a working temperature until laser light is used for irradiating the alkali metal gas chamberWhen the sub-polarization reaches the steady state, the magnetic field is compensated by adopting the magnetic field cross modulation compensation technology, at the moment, the inertia measurement system works at the compensation point of the inertia measurement system, and the steady state bias signal V of the inertia measurement system is tested and recorded out The rotation inertia measurement system obtains a scale coefficient K of the spin inertia measurement device; step 2, obtaining the electronic polarizability by a slow factor method
With step modulation experiments: continuously changing the voltage of the Z-axis coil to change the Z-axis magnetic field Bz, obtaining the output value of the system, fitting to obtain the Z-axis optical frequency shift L of the inertia measurement system z Electron relaxation rate
Frequency shift L of X-axis light x Using the parameters to obtain R m s m Term, herein R m To detect the optical pumping effect s m For detecting the degree of circular polarization of light, varying the power I of the detected light 0 The experiment was repeated to obtain R m s m And detecting the optical power I 0 The linear relationship between: r is m s m ＝K I I 0 + b, b is a constant, K I Is the slope; step 3, arranging a suppression device consisting of a 1/8 wave plate and a high-transmittance low-reflection lens on a detection light path after the detection light path is emitted from the air chamber, and repeating the operations from the step 1 to the step 2 by changing the angle of the 1/8 wave plate to obtain a new linear relation; step 4, comparing the linear relation slope K of the 1/8 wave plate under different angles I Determining the suppression effect of the pumping effect of the detection light; step 5, finally obtaining the product almost made of K I The angle value of 1/8 wave plate of =0 enables the inertia measurement system to work at the wave plate angle of "detection optical pumping effect zero point", and the interference of the detection optical pumping effect on the steady-state output of the inertia measurement system is very small at this time. The detection light pumping effect is a component of residual errors after the detection light has stable light intensity, and the residual optical rotation angle generated by the depolarization of the spherical air chamber and the dichroism absorption of the gas circle is compensated through the 1/8 wave plate, so that the stable output of the inertia measurement system is not interfered by the detection light pumping effect any more. The suppressing device is connected withThrough the method for inhibiting the detection light pumping effect based on optical path correlation cancellation, part of the emitted detection light is adjusted and injected into the air chamber again, so that the forward detection light pumping effect is counteracted, and the detection light pumping effect caused by non-ideal linear polarization can be inhibited under the condition that the main working point condition of the atomic spin inertia measuring device is not changed and the scale coefficient is not reduced basically by selecting the transmissivity of the high-transmittance low-reflectivity lens and adjusting the angle of the 1/8 wave plate.
The detection light is emitted from a detection laser 1, and then sequentially passes through a first polarizer 2, a detection liquid crystal module 3, a first analyzer 4, a first reflector 5, a first half-wave plate 6, a Glan Taylor prism 7, a first quarter-wave plate 8, an air chamber 13, a 1/8 wave plate 14, a high-transmittance low-reflectance lens 15 and a second half-wave plate 16 and then reaches a first polarization beam splitter prism 17, the first polarization beam splitter prism 17 is respectively connected with a second photoelectric detector 18 and a third photoelectric detector 19, the second photoelectric detector 18 and the third photoelectric detector 19 are both connected with an output end 20 of an SERF inertia measurement system, the Glan Taylor prism 7 is connected with the detection liquid crystal module 3 sequentially through the first photoelectric detector 10 and the first electronic control module 9, and an oven 12, a three-dimensional magnetic field coil and a magnetic shielding structure 11 are arranged on the periphery of the air chamber 13. Spin inertia measuring device includes pumping laser 21, pumping light sequence that pumping laser 21 launched passes through air chamber 13 behind first lens 22, second lens 23, the second mirror 24, second polarizer 25, pumping light path liquid crystal module 26, second analyzer 27, third half-wave plate 28 and the composite prism 29, composite prism 29 loops through fourth photoelectric detector 30 and the automatically controlled module 31 of second and connects pumping light path liquid crystal module 26.
Obtaining steady-state bias signals of the inertia measurement system under different detection optical powers through recording, obtaining scale coefficients K of the inertia measurement system through rotation, and obtaining optical frequency shift L of the inertia measurement system through amplitude-frequency response and step modulation experiments z Electron relaxation rate
Obtaining the electron polarizability by measuring the slowing factor
Thereby obtaining R at the detected optical power m s m Fitting by changing the detected light power to finally obtain R m s m Linear with detected optical power. R is m s m Slope K of linear relation with detected light power I Smaller means smaller pumping effect of the detected light.
A method for suppressing a detection optical pumping effect based on beam pair cancellation is realized by the following steps:
(1) Heating an alkali metal air chamber of an inertia measurement system to a working temperature, compensating a magnetic field by adopting a magnetic field cross modulation compensation technology when the laser polarizes atoms to a stable state, testing and recording a stable state bias signal V of the inertia measurement system when the inertia measurement system works at a compensation point of the inertia measurement system out The rotation inertia measurement system obtains a scale coefficient K of the spin inertia measurement device;
(2) Obtaining polarizability of electrons by slow-down factor method
With step modulation experiments: continuously changing the voltage of the Z-axis coil to change the magnetic field applied to the system on the Z axis, obtaining the value output by the system, fitting to obtain the Z-axis optical frequency shift L of the inertial measurement system z Electron relaxation rate of
Transverse optical frequency shift L along the X-axis x . Bringing the above quantities into R m s m Term, herein R m To detect the pumping effect of light, s m Repeating the experiment to change the power of the detection light to obtain R m s m And detecting the optical power I 0 The linear relationship between: r m s m ＝K I I 0 + b, b is a constant;
(3) The core of the related inhibition scheme is as follows: adjusting part of the detection light out of the barrel, injecting the detection light into the air chamber again to counteract the forward pumping effect, and by selecting a high-transmittance low-transmittance reflection lens with proper transmittance and adjusting the angle of the 1/8 wave plate, the detection light pumping effect caused by non-ideal linear polarization can be inhibited under the condition that the main working point condition of the atomic spin inertia measurement device is not changed and the scale coefficient is not reduced basically, and at the moment, the operation is repeatedly carried out as long as the angle of the 1/8 wave plate in the designed inhibition light path is changed, so that a new linear relation is obtained;
(4) By comparing the linear relationship slope K at various angles I Determining the suppression effect of the pumping effect of the detection light;
(5) The end result is almost K I The value of the wave plate angle is not less than 0, so that the inertia measurement system works at the wave plate angle of the detection optical pumping effect zero point, and the interference of the detection optical pumping effect on the steady-state output of the inertia measurement system is very small.
The principle of the invention is as follows: r m s m A function related to the frequency of the detected optical power of
Wherein R is m For detecting the pumping speed of the light, s m In order to detect the degree of circular polarization of light,
is the electron polarizability, gamma e Gyromagnetic ratio of electrons, U out Is the offset signal output of the system, K is the scale factor, delta B z Is the amount of change in the magnetic field of the Z axis, B n Is a magnetic field generated by nuclear spin, L x For light frequency shift along the X-axis, L z Is the shift in light frequency along the Z-axis,
is the electron relaxation rate.
The total optical frequency shift L and the electronic polarization rate obtained by combining the detected optical power and the output signal which are measured in real time and the step modulation experiment and the amplitude-frequency response
Total relaxation rate of electrons
And the pumping rate of the current detection light, namely the pumping effect of the detection light can be obtained by the parameters.
According to previous studies, the pumping speed of the detected light is a function of power and frequency.
In which I 0 To detect the power of the light, r e Is the classical electron radius, c is the speed of light, h is the Planckian constant, v pr In order to detect the frequency of the laser light,
the oscillation intensity of the D1 line which is an alkali metal Rb atom,
for the pressure broadening of the Rb atom D1 line,
is the resonance frequency of the Rb atom D1 line.
According to the formula, the power, the frequency and the polarization of the detection light jointly influence the signal output and appear in the signal in the form of residual optical rotation angle. And eliminating the residual optical rotation angle by adopting a beam of reflected light. Since the detected light intensity decays exponentially according to e, the pumping effect generated by the forward and backward propagating light can be expressed as
Wherein R is m1 (l) Represents the lateral pumping speed, R, brought by the incident of the detection light to the gas cell m2 (l) Represents the lateral pumping speed, s, brought by the reflection of the detection light back to the gas cell m1 (l) Indicating the change in ovality, s, caused by the incidence of detection light into the cell m2 (l) Indicating the change in ellipticity caused by reflection of the detection light back into the cell, I 1 (0) To detect the power of the light entering the gas cell, I 1 (l 1 ) In order to detect the power of the reflected light of the light back to the gas chamber, n is the density of the number of alkali metal atoms, sigma is the cross-sectional area of spin collision, l is the length of the light passing through the gas chamber, and l is the length of the light passing through the gas chamber 1 To detect the length of light passing through the gas cell after reflection, α is the ratio of transmitted light to reflected light, s x The ellipticity adjusted for the waveplate, and thus the pumping effect of the two oppositely propagating detection beams can be expressed as
Therefore, s can be adjusted by adjusting the 1/8 wave plate, so that the control on the detection optical pumping effect is realized.
As shown in FIG. 1, the method comprises the following steps:
(1) Heating an alkali metal gas chamber of an inertia measurement device to a working temperature, polarizing alkali metal electrons by a beam of circularly polarized pumping light, polarizing inert gas nuclei by spin exchange of the alkali metal electrons, compensating a magnetic field by adopting a magnetic field cross modulation compensation technology when the atoms are polarized to a stable state by laser, and testing and recording a stable state bias signal V of an inertia measurement system at an inertia measurement system compensation point by the inertia measurement system out The rotation inertia measurement system obtains a scale coefficient K of the spin inertia measurement device;
the power stabilizing system comprises a beam expanding lens group, a linear polarizer, a power stabilizing actuator, a 1/2 wave plate, a polarization beam splitter prism, a photoelectric detector and an electronic control unit, and the power closed-loop control is realized by the aid of the power stabilizing system. Then the light is converted into circularly polarized light with the diameter of the light spot equal to that of the air chamber through an optical isolator. The alkali metal gas chamber is installed inside the shielding cylinder and the three-dimensional magnetic field coil, and the three-dimensional magnetic field coil is composed of an X-direction magnetic field coil, a Y-direction magnetic field coil and a Z-direction magnetic field coil. The driving voltage in the coil is controlled by a signal generator.
The light output by the detection laser passes through a power stabilizing system consisting of a linear polarizer, a power stabilizing actuator, a 1/2 wave plate, a polarization beam splitter prism, a photoelectric detector and an electronic control unit, so that power closed-loop control and power setting are realized. The light source is converted into linearly polarized light after passing through a reflector, a 1/2 wave plate and a Glan Taylor prism, the linearly polarized light passes through an alkali metal air chamber, then passes through a 1/8 wave plate and a high-transmittance low-reflection wave plate respectively, the linearly polarized light is divided into two beams of light after passing through the 1/2 wave plate and a PBS prism, the light passes through a differential detector, the differential detector outputs signals to a data recorder, wherein the high-transmittance low-reflection lens can reflect a part of light back into the air chamber, and the ellipticity of the beam of light can be adjusted through the 1/8 wave plate.
The magnetic field cross modulation compensation is realized by driving a three-dimensional magnetic field coil through a signal generator. Firstly, applying square wave magnetic field modulation with peak value of 0.5nT to a Y direction by using a Y direction coil, and changing the driving voltage of a Z direction magnetic field coil to enable the steady state output difference value of an inertia measurement system to the Y direction modulation magnetic field to be 0, namely finding a Z direction magnetic field compensation point; secondly, keeping the Z-direction compensation magnetic field unchanged, applying square wave magnetic field modulation with the peak value of 0.5nT in the Z direction by using a Z-direction magnetic field coil, changing the driving voltage of a Y-direction magnetic field coil, enabling the steady-state output difference value of the inertia measurement system to the Z-direction modulation magnetic field to be 0, and finding a Y-direction magnetic field compensation point; finally, on the basis of the Z-direction compensation point, applying a bias magnetic field by using a Z-direction magnetic field coil, applying square wave magnetic field modulation with the peak value of 0.5nT in the Z direction, changing the driving voltage of the X-direction magnetic field coil, enabling the steady-state output difference value of the inertial measurement system to the Z-direction modulation magnetic field to be 0, and finding the X-direction magnetic field compensation point;
(2) Obtaining polarizability of electrons by using slow factor method
With step modulation experiments: constantly changing the Z axisThe voltage of the coil changes the magnetic field applied to the system on the Z axis to obtain the value output by the system, and fitting is carried out to obtain the Z axis optical frequency shift L of the inertial measurement system z Electron relaxation rate of
Transverse optical frequency shift L along the X-axis x . Bringing the above quantities into R m s m Term, herein R m For detecting the pumping effect of light, s m Repeating the experiment to change the power of the detection light to obtain R m s m And detecting the optical power I 0 The linear relationship between: r m s m ＝K I I 0 + b, b is a constant;
(3) The core of the related inhibition scheme is as follows: adjusting part of the detection light out of the barrel, injecting the detection light into the gas chamber again to counteract the forward pumping effect, and by selecting a high-transmittance low-reflectance lens with proper transmittance and adjusting the angle of the 1/8 wave plate, the detection light pumping effect caused by non-ideal linear polarization can be inhibited under the condition that the main working point condition of the atomic spin inertia measurement device is not changed and the scale coefficient is not reduced basically, and at the moment, the operation is repeatedly carried out as long as the angle of the 1/8 wave plate in the designed inhibition light path is changed, so that a new linear relation is obtained;
(4) By comparing the linear relationship slope K at various angles I Determining the suppression effect of the pumping effect of the detection light;
(5) Finally obtain so that K I And (4) obtaining a wave plate angle value which enables the inertia measurement system to work at the detection light pumping effect zero point, wherein the steady-state output of the inertia measurement system is not interfered by the detection light pumping effect any more.
Those skilled in the art will appreciate that the invention may be practiced without these specific details. It is pointed out here that the above description is helpful for the person skilled in the art to understand the invention, but does not limit the scope of protection of the invention. Any such equivalents, modifications and/or omissions as may be made without departing from the spirit and scope of the invention may be resorted to.
Claims (7)
1. A method for suppressing the pumping effect of detection light based on the destructive radiation of light beams is characterized by comprising the following steps:
step 1, heating an alkali metal air chamber of an SERF inertia measurement system to a working temperature, compensating a magnetic field by adopting a magnetic field cross modulation compensation technology when atoms are polarized to a stable state by laser, testing and recording a stable state bias signal V of the inertia measurement system when the inertia measurement system works at a compensation point of the inertia measurement system out The rotation inertia measurement system obtains a scale coefficient K of the spin inertia measurement device;
step 2, obtaining the electronic polarizability by using a slow-down factor method
With step modulation experiments: continuously changing the voltage of the Z-axis coil to change the Z-axis magnetic field Bz, obtaining the output value of the system, fitting to obtain the Z-axis optical frequency shift L of the inertial measurement system z Relaxation Rate of electrons
X-axis light frequency shift L x Obtaining R by using the above parameters m s m Term, herein R m To detect the optical pumping effect, s m For detecting the degree of circular polarization of light, varying the power I of the detected light 0 Repeat the experiment to obtain R m s m And detecting the optical power I 0 Linear relationship between R m s m ＝K I I 0 + b, b is a constant, and KI is a slope;
step 3, arranging a suppression device consisting of a 1/8 wave plate and a high-transmittance low-reflection lens on a detection light path after the detection light path is emitted from the air chamber, and repeating the operations from the step 1 to the step 2 by changing the angle of the 1/8 wave plate to obtain a new linear relation;
step 4, judging the suppression effect of the detection light pumping effect by comparing the linear relation slope KI of the 1/8 wave plate at different angles;
and 5, finally obtaining a 1/8 wave plate angle value almost enabling KI =0, enabling the inertia measurement system to work at a wave plate angle of 'detection optical pumping effect zero point', and enabling the inertia measurement system to output stable state output with little interference of detection optical pumping effect.
2. The method for suppressing the pumping effect of detection light based on the cancellation of the emission of light beams according to claim 1, wherein the pumping effect of detection light is a component of a residual error after the light intensity of the detection light is stabilized, and a residual optical rotation angle generated by the depolarization of the spherical gas chamber and the circular dichroism absorption of the gas is compensated through a 1/8 wave plate, so that the steady-state output of the inertial measurement system is not interfered by the pumping effect of the detection light any more.
3. The method for suppressing pumping effect of detection light based on cancellation of optical beam correlation according to claim 1, wherein the suppressing device adjusts part of the emitted detection light by suppressing pumping effect of detection light based on cancellation of optical path correlation, injects the adjusted part of the emitted detection light into the gas chamber again, and thereby cancels the pumping effect of the forward detection light, and can suppress pumping effect of detection light caused by non-ideal linear polarization without changing the condition of main operating point of the atomic spin inertia measurement device and without substantially reducing scale factor by selecting and adjusting the angle of the 1/8 wave plate for transmittance of the high-transmittance low-reflectance lens.
4. The method for suppressing the pumping effect of the detection light based on the beam-pair cancellation according to claim 1, wherein the detection light is emitted from a detection laser and then sequentially passes through a first polarizer, a detection liquid crystal module, a first polarization analyzer, a first reflector, a first half-wave plate, a Glan-Taylor prism, a first quarter-wave plate, an air chamber, a 1/8 wave plate, a high-transmittance low-reflectance lens and a second half-wave plate and then reaches a first polarization beam splitter prism, the first polarization beam splitter prism is respectively connected with a second photodetector and a third photodetector, the second photodetector and the third photodetector are both connected with an output end of an SERF (serial inertial measurement system), the Glan-Taylor prism is sequentially connected with the detection liquid crystal module through the first photodetector and a first electronic control module, and an oven, a three-dimensional magnetic field coil and a magnetic shielding structure are arranged on the periphery of the air chamber.
5. The method for suppressing detection optical pumping effect based on beam pair cancellation according to claim 1, wherein the spin inertia measurement device comprises a pumping laser, pumping light emitted by the pumping laser sequentially passes through a first lens, a second reflecting mirror, a second polarizer, a pumping optical path liquid crystal module, a second analyzer, a third half-wave plate and a combined prism and then passes through an air chamber, and the combined prism is sequentially connected with the pumping optical path liquid crystal module through a fourth photoelectric detector and a second electronic control module.
6. The method for suppressing pump effect of detection light based on cancellation of light beam emission according to claim 1, wherein steady-state bias signals of the inertial measurement system under different detection light powers are obtained through recording, a scale coefficient K of the inertial measurement system is obtained through rotation, and a light frequency shift L of the inertial measurement system is obtained through amplitude-frequency response and step modulation experiments z Electron relaxation rate of
Obtaining the electronic polarizability by measuring the slowing factor
Thereby obtaining R at the detected optical power m s m Fitting by changing the detected light power to finally obtain R m s m Linear with detected optical power.
7. The method for detecting optical pumping effect suppression based on beam-pair cancellation according to claim 1, wherein R is m s m The smaller the slope KI of the linear relationship with the detected light power, the smaller the pumping effect indicative of the detected light.
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