K-F系统中的波前相位调制与光强调制的转换

On the transformation of phase modulation to light intensity modulation in K-F system

研究在由一薄片Ｋｅｒｒ 介质与一块二维反馈镜组成的非线性光学系统中光波前相位与光强的转换过程。根据基尔霍夫衍射定理，导出了单一模式以及小畸变近似条件下多个模式的相位－ 光强转换关系的方程。结果证明：通过衍射，入射波前相位各阶Ｚｅｒｎｉｋｅ 模式成分的大小转换为反馈光光强的非线性调制。

The transformation of phase modulation to light intensity modulation in the system that consists of a slice of Kerr medium and a 2 dimension feedback mirror is studied. The phase intensity modulation transformation equation for single Zernike mode and that for multiple Zernike modes under the hypothesis of little phase distortion of wavefront are derived based on Kirchhoff diffraction theory. It is proved that the light intensity is modulated by Zernike mode components of wavefront.