光弹调制器在偏振方向调制中的应用

Application of Photoelastic Modulator in Modulation of Polarization Direction

提出了一种将光弹调制器应用于偏振方向调制的方法,介绍了它的两种基本使用模式,利用琼斯矩阵对其偏振方向调制原理及其两种基本使用模式进行了分析。光弹调制器和1/4波片形成偏振方向调制器件时,光弹调制器处于两块透光轴相互垂直的1/4波片之间,且光弹调制器的振动轴分别和两块1/4波片的透光轴成±45°角,线偏振光通过此器件其偏振方向被调制。实验验证了光弹调制器组合1/4波片调制偏振方向的原理。将光弹调制器应用在偏振方向的调制中,使现有偏振方向调制技术的光谱范围扩展到了紫外波段。

In this paper, a method that the photoelastic modulator is used to modulate the polarization direction is proposed. The modulation principle and two modes of the modulation of the polarization direction are analyzed with Jones matrix. When the photoelastic modulator is placed between two quarter-wave plates whose transmission axes are perpendicular to each other and the angles between dynamically induced birefringent axis of the photoelastic modulator and transmission axes of the two quarter-wave plats are ±45°， respectively, the polarization direction of the beam passing the photoelastic modulator and quarter wave plates is modulated. In the experiment, the modulation principle is verified. Through the application of the photoelastic modulator, the modulation of polarization direction is extended to the ultraviolet band。