本文以衍射理论为基础,通过数值计算,研究了以自聚焦和自散焦为基础的非线性折射型光限幅器的光限幅特性,探讨了样品盒的安装位置和入射光束腰斑半径的变化对折射型光限幅器工作性能的影响.结果表明:折射型光限幅器的光限幅特性曲线随激光输入功率的增加是衰减振荡的.光束聚焦差时,样品盒宜靠近焦面安装;光束聚焦好时,样品盒可稍远离焦面安装.对于自聚焦(自散焦)型非线性光限幅器,当样品盒安装在焦点左面(右边)半个瑞利范围内某位置时,透过率最小,限幅器可获得最佳限幅效果.
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