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A method to eliminate spurious light in plenoptic sagnac interferometer

An interferometer, all-optical technology, applied in instruments, optics, nonlinear optics, etc., to achieve the effect of eliminating interference

Active Publication Date: 2018-01-12
EAST CHINA NORMAL UNIV
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  • Abstract
  • Description
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Problems solved by technology

[0004] Aiming at the problem of parasitic light in the traditional Sagnac interferometer, the present invention provides a brand-new technical solution—using the nonlinear interaction process between light and matter to eliminate the parasitic interference in the all-optical Sagnac interferometer

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  • A method to eliminate spurious light in plenoptic sagnac interferometer
  • A method to eliminate spurious light in plenoptic sagnac interferometer

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Embodiment Construction

[0022] The present invention will be further described in detail in conjunction with the following specific embodiments and accompanying drawings. The process, conditions, experimental methods, etc. for implementing the present invention, except for the content specifically mentioned below, are common knowledge and common knowledge in this field, and the present invention has no special limitation content.

[0023] In the present invention, the interaction medium unit may be atoms, ions, molecules or quantum dots in the ground state. The storage medium unit of this embodiment is a pure 87 Rb atomic ensemble. figure 1 Shown is 87 Rb atomic energy levels and corresponding optical frequency diagram. Among them, 5 2 S 1 / 2 、5 2 P 1 / 2 、5 2 P 3 / 2 for 87 The fine structure of Rb atom, F=1, F=2 is the fine structure 5S 1 / 2 The hyperfine division of , its energy level difference is 6.8GHz. The dashed line shows 87 The virtual energy level of the Rb atom. To realize the cor...

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Abstract

The invention provides a method for removing parasitic light in an all-optical Sagnac interferometer based on non-linear interaction process of light and substance. The method comprises two beams of coherent light (one beam of light is the pump light, and the other beam of light is the signal light) which are polarization and orthogonal, and work in a pulse mode, and an effect medium unit capable of generating a non-linear interaction process with the coherent lights. Substance coherence generates during non-linear interaction process of the effect medium unit and the pump light and the signal light which are polarization and orthogonal. A relationship between phases and intensities exists between the substance coherence, and the pump light and the signal light. Parasitic light caused by backward direction scattering / reflection and polarization cross coupling can be separated from the polarization state by controlling polarization characteristics of the signal light and the pump light in an optical fiber coil and combining the non-linear interaction process and the Sagnac effect of the optical fiber coil, so interference of the parasitic light in an all-optical Sagnac interferometer can be effectively removed, and a novel approach is provided to high precision measurement.

Description

technical field [0001] The invention relates to an optical and precision measurement method, in particular to a brand-new method for eliminating parasitic light in a Sagnac interferometer based on the nonlinear interaction process between light and matter. Background technique [0002] Inertial technology uses the principle of inertia to realize the measurement and control of motion physical attitude and motion trajectory. It is a general term for technologies such as inertial instrumentation, inertial stability, inertial navigation, inertial guidance, and inertial measurement. Carrier motion information perception technology with strong anti-interference characteristics is widely used in inertial navigation, guidance and control, positioning and orientation, attitude stabilization, and overload sensing of various types of motion carriers in the military and national economic fields. As the core of the inertial system, the gyroscope is used to measure the angular displacemen...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/35
CPCG02F1/3519
Inventor 吴媛陈冰郭进先陈树英陈丽清张卫平
Owner EAST CHINA NORMAL UNIV