平板波导中切伦科夫型级联二阶非线性效应的理论分析

An Analytical Study on Cherenkov Cascading Second Order Nonlinearity

用解析的方法详细讨论了平板波导中的切伦科夫型级联二阶非线性效应引起的基波非线性相位移动和基波功率的变化。结果表明 ,通过选择合适的反转周期 ,可以得到相当大的基波非线性相位移动 (大于π)。由于切伦科夫型非线性器件结构比准相位匹配器件具有更大的容差 ,并且基波和谐波自然分离 。

The analytical study on the nonlinear phase shift and the change of fundamental wave amplitude caused by Cherenkov cascading second order nonlinearity is given. The result shows that a very large nonlinear phase shift (>π) could be attained by choosing an appropriate reversal period, and a rather large nonlinear phase shift can be attained even if the waveguide does not modulated periodically. The Cherenkov configuration has many advantages such as the large fabrication tolerance, the natural separation of fundamental wave and the SHG wave etc, thus this configuration can be applied to the all-optical switches.