光学学报, 2019, 39 (6): 0623001, 网络出版: 2019-06-17  

旋光-电光晶体的电光调制特性及π-电压 下载: 1067次

Electro-Optic Modulation Characteristics of Optically Active and Electro-Optical Crystal and Its π-Voltage
李长胜 1,2,*
作者单位
1 北京航空航天大学仪器科学与光电工程学院, 北京 100083
2 北京航空航天大学微纳测控与低维物理教育部重点实验室, 北京 100083
摘要
分析旋光-电光晶体的电光相位以及强度调制特性,并定义晶体的π-电压。对于具有旋光性的电光晶体,以往半波电压的概念不能准确描述其电光偏振、强度调制的周期性,因而引入π-电压这一概念,并将其定义为此类晶体的椭圆双折射相位延迟变化量等于π时所需要的调制电压。对于置于两个偏振器之间的旋光-电光晶体强度调制器,旋光性可以为电光强度调制提供光学偏置,但调制光强度是调制电压的偶函数,只有当检偏器的主透光方向平行或垂直于晶体出射线偏振光波的偏振方向时,才能实现完全的电光开关。当将此类晶体用于电光开关时,可定义能够实现完全开关状态转换所需要的最大调制电压为开关电压。通过实验测量了一块尺寸为6 mm×4 mm×2.9 mm的硅酸铋(Bi12SiO20)晶体的π/4-电压,对于635 nm的光波长,π/4-电压约为3 kV。对于具有旋光性的弹光调制器,可以引入π-应力和π-应变的概念。
Abstract
This study investigates the electro-optical phase and intensity modulation characteristics of the optically active and electro-optical crystal and defines its π-voltage. For electro-optic crystals with optical activity, the former concept of half-wave voltage cannot accurately describe the periodical characteristics of electro-optic polarization and intensity modulation. Thus, the π-voltage concept is introduced and defined as the modulation voltage required for the elliptical birefringence phase-delay variation of such a crystal to be equal to π. As for an optically active and electro-optical crystal intensity modulator inserted between two polarizers, the optical activity can provide optical bias for electro-optical intensity modulation. However, the modulated light intensity is an even function of the modulation voltage, and an electro-optical switch can be fully used only when the transmission direction of the analyzer is parallel or perpendicular to the polarization direction of the emerging light from the crystal. As for an electro-optical switcher based on such a crystal, the maximum modulation voltage required to achieve a full switching-state transition can be defined as its switching voltage. The π/4-voltage of a bismuth silicate (Bi12SiO20) crystal with dimensions of 6 mm×4 mm×2.9 mm is experimentally measured and found to be approximately 3 kV for a wavelength of 635 nm. Similarly, the concepts of π-stress and π-strain can be defined for the elasto-optic modulator with optical activity.

李长胜. 旋光-电光晶体的电光调制特性及π-电压[J]. 光学学报, 2019, 39(6): 0623001. Changsheng Li. Electro-Optic Modulation Characteristics of Optically Active and Electro-Optical Crystal and Its π-Voltage[J]. Acta Optica Sinica, 2019, 39(6): 0623001.

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