折射型光限幅器中参量的最优化设计研究  

Optimizing Parameters of Optical Limiter Based on Nonlinear-Refraction

作　　者：王龙[1] 牛燕雄[1,2] 沈学举[1] 杨海林[1] 唐芳[1] 姜楠[1] 陈燕[1] 严文科[1] 张博[1] 

机构地区：[1]解放军军械工程学院光学与电子工程系,石家庄050003 [2]清华大学精密仪器测试技术与仪器国家重点实验室,北京100084

出　　处：《光子学报》2009年第5期1035-1040,共6页Acta Photonica Sinica

基　　金：中国博士后科学基金(20060400418);解放军军械工程学院重点研究基金(YJJXM05002)资助

摘　　要：以衍射理论为基础,用箝位输出功率表征限幅器的限幅效果,推导了折射型光限幅器出射功率的表达式.数值计算了连续激光照射下,限幅器出射功率、限幅能力和最佳限幅位置的变化规律.结果表明:限幅器的出射功率随入射功率的增加衰减振荡,其振荡周期取决于介质相对于光束焦点的位置;限幅器的限幅能力随入射光束腰半径和光阑孔径的变大而减弱;入射功率范围固定,入射光束腰半径和光阑孔径增大时,介质的最佳限幅位置向入射光束的焦点靠近,但是在某些入射功率范围内会存在多个最佳限幅位置;光限幅器的箝位输出功率随光阑线性透过率的增加存在线性增加和非线性增加两个不同区域,实际应用中应在线性增加区域确定光阑孔径的大小.Taking the diffraction theory as the foundation, with the maximum output power representing the effect of optical limiter, expression of output power in optical limiter based on nonlinear-refraction was derived. Rules of output power, limiting ability and the best position of medium to limit were analyzed in numerical method when the limiter was irradiated by continuous Gaussian beam. The result indicates that the output power oscillates and weakens along with increasing input power, and its oscillation period depends on the distance between the medium and beam focal point. Limiterfs limiting ability will decrease if waist size of the incident Gaussian beam and the aperture size increase. With a fixed input power scope, mediumls best limiting position will move towards the focal point if waist size of Gaussian beam and the aperture size increase, but the best limiting position will change a lot with different input power scopes. There will be linear and nonlinear scopes when the maximum output power varies along with the transmittance of aperture.WANG Long was born in 1985. He is now studying for the M. S. degree at （）ptics Electrical Engineering Department of Ordnance Engineering College, and his research interest focuses on laser protection.

关 键 词：光限幅 箝位输出功率 最佳限幅位置 光阑孔径 束腰半径 

分 类 号：O437[机械工程—光学工程]