基于准相匹配线性电光效应的激光偏振态操控

摘要/Abstract

摘要：

基于周期性极化铌酸锂(PPLN)晶体的准相位匹配线性电光效应，利用邦加球理论，晶体在不同占空比和温度下，探索了输出激光偏振态随外加电场的演变规律。研究结果发现，激光偏振的演变对外加电场E0、晶体占空比D和温度T0非常敏感; 若T0=273K， D=0.25、0.5和0.75，随着E0的增加，输出偏振态成周期性演变; 当D为0.75，且T0为263K、293K和313K时，输出偏振态的演变表现为无规则性。合理选择一定的外加电场、占空比和温度，可以实现任意偏振光。这些结果有助于PPLN偏振控制器的优化设计。

关键词: 激光技术, 激光偏振态控制, 邦加球理论, 准相位匹配线性电光效应, 周期性极化铌酸锂晶体

Abstract:

Based on linear electro-optic effect with quasi-phase matching in periodically poled LiNbO3 crystal, the evolution laws of the output laser polarization with the applied electric field have been explored by means of the poincare sphere theory, under different the duty ratio of the crystal and the temperature of one. It is found that the evolution of the output laser polarization is very sensitive to the Based on linear electro-optic effect with quasi-phase matching in periodically poled LiNbO3 crystal, the evolution laws of the output laser polarization with the applied electric field have been explored by means of the poincare sphere theory, under different the duty ratio of the crystal and the temperature of one. It is found that the evolution of the output laser polarization is very sensitive to the applied electric field E0, the crystal duty ratio D and the crystal temperature T0. With the T0 fixed at 273K, and the D fixed at 0.25, 0.5 and 0.75, the output polarization appears periodical evolution with the increase of the E0. If the D is of 0.5, and the T0 is of 263K, 293K and 313K, the evolutions of the laser polarization show irregular. Arbitrary polarized light can be performed by reasonable selection of a certain applied electric field, the duty ratio and the temperature. These results are helpful to optimization design of the polarization controller based on PPLN crystal.

Key words: laser technology, control of laser polarization state, poincare sphere theory, linear electro-optic effect with quasi-phase matching, periodically poled LiNbO3 crystal

中图分类号:

TN29

钟东洲王玉青. 基于准相匹配线性电光效应的激光偏振态操控[J]. J4, 2015, 32(5): 555-562.

ZHONG Dongzhou, WANG Yuqing . Manipulation of laser polarization based on the linear electro-optic effect with quasi-phase matching[J]. J4, 2015, 32(5): 555-562.

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