Abstract

A mechanism of the formation of a photodeflection response in a periodically polarized nonlinear crystal illuminated by a Bessel light beam (BLB) is considered. The thermal-field distribution is found, and the exact solution of the system of heat-conduction equations is obtained using the Fourier–Bessel and Laplace integral transforms for a three-layer system consisting of a nonlinear crystal, a substrate, and environment. A method for controlling the amplitude of the photodeflection signal is proposed based on the application of axicons with an adjustable taper angle or optical schemes providing a change in the conicity of BLBs.

中文翻译：

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贝塞尔光束在周期性偏振非线性晶体中的光热转变

摘要

考虑了在由贝塞尔光束（BLB）照射的周期性偏振的非线性晶体中形成光偏转响应的机制。找到了热场分布，并针对由非线性晶体，衬底和环境组成的三层系统，使用傅里叶-贝塞尔和拉普拉斯积分变换，获得了热传导方程组的精确解。基于具有可调锥角的轴锥的应用或提供BLB锥度变化的光学方案，提出了一种控制光偏转信号幅度的方法。