脉冲式可控偏振态变换器及其应用

本文提出一种基于晶体双折射效应的脉冲式可控偏振态变换器,可以实现偏振光六个偏振分量的脉冲变换.将它应用于偏振型光传感信号的单光路分时检测,可以提高信号检测灵敏度和传感信号的抗干扰能力.文中给出了利用铌酸锂晶体和脉冲电场对光传感信号的X、Y线性偏振分量进行脉冲变换的实验结果.

PULSE-CONTROLLED POLARIZATION CONVERTER AND ITS APPLICATIONS

Based on the birefringence effect in some crystals, the pulse -- controlled polarization converter is advanced in this paper. It can convert the six polarization components of the polarized light into light intensity pulse by time--shared control system. The fundamental principle of the converter is presented. Generally, the pulse -- controlled polarization converter may be constituted by the electro--optic crystal with the dual transverse Pockels effect,the coded pulse electric field and the analyzer with a fixed direction. The different sensing signals contained in the different polarization components of the polarized light can be obtained by the converter and the time -- shared detection system through a single light path. This method can improve the sensitivity of signal detection and its anti--jamming. It is experimentally showed that the X,Y polarization components of the polarized light can be converted into light intensity pulses at a fixed direction by using a lithium niobate crystal and a pulse electric field.