中国激光, 2002, 29 (7): 595, 网络出版: 2006-08-08
声光效应拉曼-内斯方程矩阵级数解法及声光调制器优化设计
Matrix Series Method of the Raman-Nath Equation of Ultrasonic Light Diffraction and Its Application to the Optimum Design of Acousto-optics Modulator
声光效应 衍射效率 拉曼-内斯方程 矩阵级数解法 ultrasonic light diffraction diffraction efficiency Raman-Nath equation matrix series method
摘要
提出一种求解正常声光相互作用拉曼-内斯(Raman-Nath)方程的矩阵级数解法,该解法直观方便且具有普遍性.计算结果表明,对Q=4.1π,Bragg衍射的效率只有97.5%;对非对称入射,以往的Raman-Nath近似解误差较大;指出提高Bragg衍射效率的有效途径在于提高声光频率比并给出计算声光器件最优长度的计算公式.
Abstract
A universal and convenient matrix series method to solve the Raman Nath equation of normal ultrasonic light diffraction is presented. The results show that the diffraction efficiency for Bragg approach is only 97.5% at Q=4.1π, and that for asymmetry incidence, there is large error in previous Raman Nath approach. The formula of the optimum length of the acousto optics modulator is given. Increasing the ratio of acoustical frequency to optical frequency is a effective way to improve the diffraction efficiency.
黎永航, 蔡懿, 郑国梁, 林旭斌, 佘卫龙. 声光效应拉曼-内斯方程矩阵级数解法及声光调制器优化设计[J]. 中国激光, 2002, 29(7): 595. 黎永航, 蔡懿, 郑国梁, 林旭斌, 佘卫龙. Matrix Series Method of the Raman-Nath Equation of Ultrasonic Light Diffraction and Its Application to the Optimum Design of Acousto-optics Modulator[J]. Chinese Journal of Lasers, 2002, 29(7): 595.
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