Polarization laser beam generation method based on liquid crystal variable phase delayer

Abstract

The invention discloses a polarization laser beam generation method based on a liquid crystal variable phase delayer. The liquid crystal variable phase delayer with an electric flexible control function is used as a core component, polarization state output control and adjustment are conducted on a laser signal through the liquid crystal variable phase delayer without a moving component, the supply voltage value of the liquid crystal variable phase delayer is changed through a self-adaptation control algorithm, so that the phase retardation is changed, hence, self-adaptation control over the polarization state of the incident laser signal can be realized, and finally high-precision and high-stability polarization state output of a laser light source is guaranteed. The method can be used for generating laser beams with any polarization state, the polarization laser beams can be generated through a closed-loop control technology, and the laser beams generated through the method have a high-precision and high-stability polarization state. The method solves the problem that a laser communication system based on polarization modulation has a demanding requirement on the precision and stability of the polarization state of the laser light source.

Description

technical field [0001] The invention provides a method for generating a polarized laser beam based on a liquid crystal variable phase retarder, in particular relates to a method for generating a high-precision polarized laser beam, which belongs to the technical field of laser generation. Background technique [0002] In the space laser communication system, after the laser signal is transmitted in the atmospheric channel for a long distance, the beam will be affected by factors such as atmospheric turbulence and background light noise, which greatly reduces the communication efficiency of the traditional optical communication system using OOK modulation. It greatly limits the promotion and application of free space optical communication technology. In order to effectively improve the reliability of space laser communication systems, researchers from all over the world have turned their attention to polarized light communication. Polarization Shift Keying (PolSK) uses the v...

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Problems solved by technology

[0005] The invention discloses a method for generating a polarized laser beam based on a liquid crystal variable phase retarder, which uses a closed-loop control technology to realize the generation of a polarized laser beam, and solves the problem of polarization state accuracy and stability of a laser light source in a laser communication system based on polarization modulation demanding the question

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