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

作　　者：黎永航[1] 蔡懿[1] 郑国梁[1] 林旭斌[1] 佘卫龙[1] 

机构地区：[1]中山大学超快速激光光谱学国家重点实验室和中山大学物理系,广州510275

出　　处：《中国激光》2002年第7期595-599,共5页Chinese Journal of Lasers

基　　金：广东省自然科学基金资助课题 (批准号 980 35 9)

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。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.

关 键 词：声光调制器 声光效应 衍射效率 拉曼-内斯方程 矩阵级解法 声光耦合波动方程 

分 类 号：TN761[电子电信—电路与系统]