Li Changsheng
School of Instrument Science & Optoelectronic Engineering, Beihang University, Xueyuan Road 37,Haidian District, Beijing 100083, China.
Appl Opt. 2008 May 1;47(13):2241-51. doi: 10.1364/ao.47.002241.
Based on dual transverse Pockels effect, complete polarization conversion can be achieved by using only one electro-optic crystal and its two externally applied voltages. The electro-optic phase retardation and the azimuth angle of the field-induced principal dielectric axes of the crystal can be independently and linearly controlled by the amplitude and direction of the applied electric field, and the formulas for this correlation are deduced for arbitrary input and output polarization states. The candidate crystals mainly include the uniaxial crystals of 3 m, 62 m, and 32 symmetry groups, and the cubic crystals of 43 m and 23 symmetry groups. Theoretical analysis demonstrates that one crystal exhibiting both dual transverse Pockels effect and optical activity can also be used for complete polarization converter. The continuous polarization rotation of a linearly polarized light from 0 degrees to 180 degrees has been performed experimentally by use of single lithium niobate crystal with four lateral electrodes. In addition the light beam position-dependent polarization conversion by using a bulk electro-optic crystal is also measured in the experiment. This new type of polarization converter will have potential applications in many fields due to its simple configuration, explicit control logic of polarization conversion, and lower power consumption.
基于双横向泡克尔斯效应，仅使用一块电光晶体及其两个外部施加电压就可以实现完全偏振转换。晶体的电光相位延迟和由电场感应的主介电轴的方位角可以通过施加电场的幅度和方向独立且线性地控制，并且针对任意输入和输出偏振态推导了这种相关性的公式。候选晶体主要包括3m、62m和32对称群的单轴晶体，以及43m和23对称群的立方晶体。理论分析表明，一种同时表现出双横向泡克尔斯效应和旋光性的晶体也可用于完全偏振转换器。通过使用具有四个横向电极的单块铌酸锂晶体，已经在实验中实现了线偏振光从0度到180度的连续偏振旋转。此外，在实验中还测量了使用块状电光晶体的光束位置相关的偏振转换。这种新型偏振转换器由于其简单的结构、明确的偏振转换控制逻辑和较低的功耗，将在许多领域具有潜在应用。
