SERF gyroscope coupling spinning rapid overturning method based on magneto-optical pulse regulation and control
By coordinating the control of the π-pulse magnetic field and the polarization switching of the pump light driven by the electro-optic modulator in the SERF atomic spin gyroscope, the problem of the difficulty in rapidly reversing the spin polarization direction of inert gas nuclei was solved, achieving efficient spin polarization control and improving the accuracy and stability of inertial measurements.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-01-09
- Publication Date
- 2026-03-31
AI Technical Summary
Existing technologies struggle to rapidly and stably flip the polarization direction of inert gas nuclear spins without disrupting the SERF self-compensation state, making it difficult to suppress low-frequency drift errors in the system and affecting measurement accuracy and stability.
By coordinating the control of the π-pulse magnetic field and the polarization switching of the pump light driven by the electro-optic modulator in the SERF atomic spin gyroscope, the rapid flipping of the electron spin of alkali metal and the nuclear spin of inert gas is achieved, and the polarization control is performed in the self-compensated working state using the magneto-optic pulse modulation method.
This technology enables efficient and rapid flipping of the coupled spin system, reduces dead time, improves the dynamic response capability of the gyroscope, and provides key technical support for high-precision inertial measurement.
Smart Images
Figure CN121761854A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the fields of inertial navigation and quantum precision measurement technology, and in particular to a method for rapid spin flipping of SERF gyroscopes based on magneto-optical pulse modulation. Background Technology
[0002] Atomic spin gyroscopes based on the spin-free exchange relaxation (SERF) effect have become one of the core development directions of next-generation inertial navigation technology due to their extremely high theoretical sensitivity and miniaturization potential. Inertial navigation systems integrated with high-precision gyroscopes have wide applications in long-endurance unmanned aerial vehicles (UAVs) and deep-sea navigation.
[0003] The core measurement unit of the SERF atomic spin gyroscope is a coupled spin system, formed by the spin-exchange coupling of the electron spins of alkali metal atoms and the nuclear spins of rare gases.
[0004] In measurements, to effectively suppress low-frequency errors introduced by factors such as temperature fluctuations and laser parameter drift, the polarization direction of the coupled spin ensemble can be periodically flipped to eliminate common-mode noise and low-frequency drift errors. However, for inert gas nuclear spins, while the ultralong coherence time is beneficial for maintaining the quantum state, it is difficult to achieve efficient polarization direction flipping. Using optical polarization modulation to flip polarization is limited by the time constant, resulting in slow relaxation and re-reversal hyperpolarization processes. Using resonant magnetic field driving affects the SERF self-compensation working state and introduces additional relaxation, making it difficult to maintain consistent polarizability before and after the flip. Therefore, achieving rapid and stable polarization direction flipping of the coupled spin system without disrupting the SERF self-compensation state and avoiding additional relaxation remains a crucial problem that must be solved to further improve the measurement accuracy and stability of SERF inertial measurement technology and move towards practical application.
[0005] Therefore, a method for rapid spin-flipping of SERF gyroscopes based on magneto-optical pulse modulation is provided to solve the above problems. Summary of the Invention
[0006] The purpose of this invention is to provide a method for rapid spin switching of SERF gyroscope coupled with magneto-optical pulse modulation. By coordinating the control of the π-pulse magnetic field and the rapid switching of the pump light polarization driven by the electro-optic modulator (EOM) in the SERF atomic spin gyroscope, the coupled spin system composed of alkali metal electron spin and inert gas nuclear spin can achieve efficient and rapid switching while maintaining a self-compensating working state. This method is suitable for the periodic control of coupled spin polarization in high-precision atomic spin gyroscopes and the suppression of low-frequency drift errors in the system.
[0007] To achieve the above objectives, this invention provides a method for rapid spin-flipping of SERF gyroscopes based on magneto-optical pulse modulation, comprising the following steps: S1: Coupled spin ensemble polarization preparation: Preparing K-Rb-... 21 The atomic chamber of the Ne mixed gas is placed in a high-temperature, weak magnetic environment; the left-handed circularly polarized pump light σ+ optically pumps the electron spins of alkali metal atoms along the Z-axis, and after the spin exchange effect is applied to the hyperpolarized inert gas nuclei spin, a positive compensating magnetic field is applied along the Z-axis. S2: Turn off the positive compensation magnetic field and left-handed circularly polarized pump light on the Z-axis, and apply a duration of [duration missing] on the X-axis. π-pulse magnetic field; S3: Magneto-optical co-switching: The π-pulse magnetic field applied along the X-axis continues until... At that time, the left-hand circularly polarized pump light is switched to the right-hand circularly polarized pump light, and the positive compensation magnetic field applied to the Z-axis is switched to the reverse compensation magnetic field. S4: When the π pulse magnetic field applied to the X-axis ends, turn on the reverse compensation magnetic field and the right-hand circularly polarized pump light to complete the coupled spin flip.
[0008] Preferably, a positive compensation magnetic field is used in S1. Virtual magnetic field generated by electron spin polarization of alkali metals The virtual magnetic field generated by the spin polarization of inert gas nuclei The relationship between them is: ; At the current moment, the coupled spin macroscopic polarization is along the +Z direction and is at the SERF self-compensating operating point.
[0009] Preferably, the duration of the π pulse magnetic field in S2 Satisfying the relation: ; in It is an inert gas 21 The gyromagnetic ratio of the Ne nucleus spin It is the amplitude of the π pulse magnetic field.
[0010] Preferably, in S3, the left-hand circularly polarized pump light σ+ is switched to the right-hand circularly polarized pump light σ- by the control voltage of the electro-optic modulator EOM high-voltage driver. The optical polarization phase delay π is set by the half-wave voltage of the crystal corresponding to the control voltage of the electro-optic modulator EOM high-voltage driver for the left-hand circularly polarized pump light σ+ and the right-hand circularly polarized pump light σ-. accomplish.
[0011] Preferably, in S4, the reverse compensation magnetic field of the Z-axis is turned on. At the current moment, the spin polarization of the inert gas nucleus is along the -Z direction, and the right-hand circularly polarized pump light σ-flips the alkali metal electron spin, completing the coupled spin flip.
[0012] Therefore, the present invention employs the aforementioned SERF gyroscope-coupled spin fast flipping method based on magneto-optical pulse modulation, and the technical effects are as follows: (1) The present invention enables the coupled spin system to enter a new, matched SERF self-compensation working state instantly after the flip is completed by setting the compensation magnetic field on the Z-axis and rapidly coordinating the switching of the pump light polarization state and the precise synchronization of the pulse magnetic field on the X-axis.
[0013] (2) This invention, through the optical-magnetic timing coordinated control mechanism, avoids introducing additional relaxation and maintains the stability of the system's self-compensating operating point while ensuring the efficient and fast flip-coupled spin system; minimizes dead time and improves the dynamic response of the gyroscope, providing key technical support for achieving high-precision and high-stability inertial measurement. Attached Figure Description
[0014] Figure 1 This is a flowchart of the SERF gyroscope coupling spin fast flipping method based on magneto-optical pulse control according to the present invention. Detailed Implementation
[0015] The technical solution of the present invention will be further described below with reference to the accompanying drawings and embodiments.
[0016] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains.
[0017] Example This invention provides a method for fast spin-flipping of SERF gyroscopes based on magneto-optical pulse modulation, such as... Figure 1 As shown, it includes the following steps: S1: Coupled spin ensemble polarization preparation: Preparing K-Rb-... 21 The atomic chamber of the Ne mixed gas is placed in a high-temperature, weak magnetic environment; a positive compensation magnetic field is applied along the Z-axis, and left-handed circularly polarized pump light is used to optically pump the electron spins of alkali metal atoms along the Z-axis, thereby hyperpolarizing the nuclear spins of the inert gas through spin exchange. Positive compensation magnetic field in S1 Virtual magnetic field generated by electron spin polarization of alkali metals The virtual magnetic field generated by the spin polarization of inert gas nuclei The relationship between them is: ; At the current moment, the coupled spin macroscopic polarization is along the +Z direction and is at the SERF self-compensating operating point.
[0018] S2: Turn off the positive compensation magnetic field along the Z-axis. And left-handed circularly polarized pump light σ+, applied along the X-axis for a duration of The π-pulse magnetic field in S2; the duration of the π-pulse magnetic field in S2 Satisfying the relation: ; Ensure that the inert gas nucleus spins precisely complete a 180° flip; among which It is an inert gas 21 The gyromagnetic ratio of the Ne nucleus spin It is the amplitude of the π pulse magnetic field.
[0019] S3: Magneto-optical co-switching: The π-pulse magnetic field applied along the X-axis continues until... At that time, the left-hand circularly polarized pump light σ+ is switched to the right-hand circularly polarized pump light σ-, and a positive compensation magnetic field is applied along the Z-axis. Switch to reverse compensation magnetic field In S3, the left-hand circularly polarized pump light σ+ is switched to the right-hand circularly polarized pump light σ- by the control voltage of the electro-optic modulator EOM high-voltage driver. The optical polarization phase delay π is determined by setting the phase difference between the control voltages of the left-hand circularly polarized pump light σ+ and the right-hand circularly polarized pump light σ- by the control voltages of the corresponding electro-optic modulator EOM high-voltage drivers, which is the half-wave voltage of the crystal. accomplish.
[0020] S4: At the end of the π-pulse magnetic field applied along the X-axis, the reverse compensation magnetic field and the right-hand circularly polarized pump light are activated, completing the coupled spin flip. In S4, the reverse compensation magnetic field along the Z-axis is activated. At the current moment, the spin polarization of the inert gas nucleus is along the -Z direction, and the right-hand circularly polarized pump light σ-flips the alkali metal electron spin, completing the coupled spin flip and restoring the normal working state under the SERF self-compensation mechanism.
[0021] Example 2 The method of this invention is applied to the SERF atomic spin gyroscope, and the specific implementation process is as follows: Figure 1 As shown, it includes the following steps: S1: Coupled spin ensemble polarization preparation: Preparing K-Rb-... 21 The atomic chamber of the Ne mixed gas is placed in an oven equipped with a non-magnetic electric heating film. The oven is placed within a combined magnetic shielding structure consisting of four layers of permalloy and one layer of manganese-zinc ferrite, and the chamber is heated to 195°C under the weak magnetic environment provided by the structure. Left-handed circularly polarized (σ+) pump light optically pumps the electron spins of alkali metal atoms along the Z-axis, hyperpolarizing the inert gas nuclei's spins through spin exchange. After polarization, remanence compensation is performed through a triaxial magnetic compensation coil, and the Z-axis magnetic field is configured in the positive compensation magnetic field. ) place; Positive compensation magnetic field in S1 Virtual magnetic field generated by electron spin polarization of alkali metals The virtual magnetic field generated by the spin polarization of inert gas nuclei The relationship between them is: ; At the current moment, the coupled spin macroscopic polarization is along the +Z direction and is at the SERF self-compensating operating point.
[0022] S2: Turn off the positive compensation magnetic field along the Z-axis ( ) and left-handed circularly polarized (σ+) pump light, applied along the X-axis for a duration of The π-pulse magnetic field in S2; the duration of the π-pulse magnetic field in S2 Satisfying the relation: ; in =0.003361 Hz / nT, corresponding to inert gas 21 The gyromagnetic ratio of the Ne nucleus spin It is the amplitude of the π pulse magnetic field.
[0023] S3: Magneto-optical co-switching: The π-pulse magnetic field applied along the X-axis continues until... At this time, the left-hand circularly polarized pump light is switched to the right-hand circularly polarized pump light, and the positive compensation magnetic field applied along the Z-axis is switched to the reverse compensation magnetic field; in S3, the control voltage of the electro-optic modulator EOM high-voltage driver switches the left-hand circularly polarized pump light σ+ to the right-hand circularly polarized pump light σ-. The optical polarization phase delay π is set by setting the phase difference between the control voltages of the left-hand circularly polarized pump light σ+ and the right-hand circularly polarized pump light σ- and the control voltages of the corresponding electro-optic modulator EOM high-voltage drivers, which is the half-wave voltage of the crystal. accomplish.
[0024] S4: At the end of the π-pulse magnetic field applied along the X-axis, the reverse compensation magnetic field and the right-hand circularly polarized pump light are activated, completing the coupled spin flip. In S4, the reverse compensation magnetic field along the Z-axis is activated. At the current moment, the spin polarization of the inert gas nucleus is along the -Z direction, and the right-hand circularly polarized pump light σ-flips the alkali metal electron spin, completing the coupled spin flip.
[0025] Therefore, this invention employs the aforementioned SERF gyroscope coupled spin rapid flipping method based on magneto-optical pulse modulation. By coordinating the control of the π-pulse magnetic field and the rapid switching of the pump light polarization driven by the electro-optic modulator EOM in the SERF atomic spin gyroscope, it achieves efficient and rapid flipping of the coupled spin system composed of alkali metal electron spin and inert gas nuclear spin while maintaining a self-compensating working state. This method is suitable for the periodic control of coupled spin polarization and the suppression of low-frequency drift errors in high-precision atomic spin gyroscopes.
[0026] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the present invention, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.
Claims
1. A method for coupling spin exchange relaxation free (SERF) gyroscope with spin- fast-flip based on magneto-optical pulse regulation, characterized in that, The method comprises the following steps: S1: Coupling spin ensemble polarization preparation: K-Rb- 21 The atomic gas chamber of Ne mixed gas is placed in a high-temperature and weak-magnetic environment; left-handed circularly polarized pumping light σ+ is used to optically pump the electron spins of alkali metal atoms along the Z axis, and a positive compensation magnetic field is applied along the Z axis after the hyperpolarization of inert gas nuclear spins through spin exchange. S2: turn off the positive Z-axis compensation magnetic field and left-handed circularly polarized pump light, and apply a π pulse magnetic field with a duration of on the X-axis; S3: Magneto-optical cooperative switching: the π-pulse magnetic field applied in the X axis lasts until the left-handed circularly polarized pump light is switched to the right-handed circularly polarized pump light, and the positive compensation magnetic field applied in the Z axis is switched to the reverse compensation magnetic field; S4: at the end of the π pulse magnetic field applied in the X axis, the reverse compensation magnetic field and the right circularly polarized pumping light are turned on, and the coupling spin flip is completed.
2. The SERF gyroscope coupling spin-fast-flip method based on magneto-optical pulse regulation according to claim 1, characterized in that, In S1 the magnetic field is compensated in forward direction The virtual magnetic field generated by alkali metal electron spin polarization and the virtual magnetic field generated by noble gas nuclear spin polarization The relationship between them is: ； The coupling spin macro polarization at the current moment is along the +Z direction and at the SERF self-compensation working point.
3. The method of claim 1, wherein the coupling of the spin exchange relaxation free (SERF) gyroscope to the magnetic optical pulse regulation is based on a spin exchange relaxation free (SERF) gyroscope coupled to a magnetic optical pulse regulation. S2 π-pulse magnetic field duration , satisfying the relationship: ； wherein is an inert gas 21 the gyromagnetic ratio of the Ne nuclear spin, is the π pulse magnetic field amplitude.
4. The SERF gyroscope coupled spin-flop method based on magneto-optical pulse regulation according to claim 1, wherein, In S3, the control voltage of the high voltage driver of the electro-optic modulator EOM switches the left circularly polarized pump light σ+ to the right circularly polarized pump light σ-, and the light polarization phase delay π is realized by setting the control voltage of the high voltage driver of the electro-optic modulator EOM corresponding to the half-wave voltage of the crystal for the left circularly polarized pump light σ+ and the right circularly polarized pump light σ- Implementation.
5. The magneto-optical pulse controlled SERF gyroscope coupled spin- fast-flip method according to claim 1, wherein, S4 opens the reverse compensation magnetic field of Z axis , the current moment, the noble gas nuclear spin polarization along the -Z direction, the right circularly polarized pumping light σ-inverted alkali metal electron spin, completed coupling spin flip.