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针对偏振编码激光驾束制导对编码器的要求,基于铌酸锂晶体的电光效应,设计了适用的编码器。编码器采用铌酸锂双晶体块空气层耦合,可以把线偏振光转换成与空间位置对应的多偏振态输出。对编码器设计中能量透过率、空气层厚度、调制电压等问题进行了分析,分析结果表明,空气层产生的光程差和空气层厚度成正比,和编码器的长高比成反比,半波电压与编码器的长高比成正比,采用铌酸锂双晶体耦合偏振编码器,编码器的长高比应大于2.7。实验结果表明:编码器可以实现空间偏振编码。
Aiming at the requirement of encoder for laser beam guidance in polarization coding, a suitable encoder is designed based on the electro-optic effect of lithium niobate crystal. Encoder using lithium niobate double crystal block air layer coupling, linear polarized light can be converted into space with the corresponding multi-polarization state output. The problems of energy transmittance, air layer thickness and modulation voltage in the encoder design are analyzed. The results show that the optical path difference caused by the air layer is proportional to the air layer thickness and inversely proportional to the aspect ratio of the encoder, The half-wave voltage is proportional to the aspect ratio of the encoder, using a lithium niobate dual-crystal coupled polarization encoder with an encoder height-to-height ratio greater than 2.7. Experimental results show that the encoder can achieve spatial polarization coding.