入射光功率比对KNSBN晶体相位共轭特性的影响

Investigation of the Influence of the Crystal Input Optical Power on Phase Conjugate Properties

为了研究入射光功率对自-互抽运相位共轭特性的影响.通过改变其中一束入射光的功率从而改变入射光功率比,研究了无预置光栅和有预置光栅两种情况下,入射位置、入射角度一定时,入射光功率比对相位共轭反射率的影响.得到有预置光栅时,总相位共轭反射率和互抽运相位共轭反射率在自-互抽运共存期间存在一个极大值,该极大值依赖于入射光功率比.结果表明:自-互抽运相位共轭共存期间,晶体内的自-互抽运相位共轭光路相互交叉覆盖,可相互擦除各自所形成的相位光栅,若仅擦除的是一些噪音光栅,则相位共轭反射率增强,若擦除的是主光栅,则相位共轭反射率降低.

Based on self-pumped phase conjugation and mutual-pumped phase conjugation experiment in KNSBN crystal,the influence of the input optical power on phase conjugate properties was investigated.The maximum output conjugation is found in the certain input optical power ratio when the input position and the input angle were made certain.The results show the self-pumped phase conjugation and mutual-pumped phase conjugation was competed and erased each other.The phase conjugation reflectivity increased when the noise grating was erased or the phase conjugation reflectivity reduced when the main grating was erased.