高斯-谢尔模型光束通过非线性介质后的光强分布

The Intensity Distribution of GSM Beam Transmitted Through Thin Nonlinear Medium

根据高斯-谢尔模型光束在自由空间中传输的特性,研究它在穿过非线性介质后的衍射光强.数值模拟表明,穿过非线性介质后,高斯-谢尔光束的光强变化受到光束的相干度和通过非线性介质后产生的附加相移的共同影响.对应于同样的部分相干光,相同的条件下大的附加相移能够增强相干度对光强的影响,使光强曲线发生明显的波动;对应于确定的附加相移,相干度大的光束光强曲线变化更为明显.随着传输距离的增大,不同附加相移的光束光强大小发生变动,附加相移最小的光束光强最后将大于附加相移最大的光束光强.

Based on the character of the Gaussian Schell-model （GSM） beam＇s transmission in free space, the paper analyzed the intensity after the GSM beam through the nonlinear medium. Numerical simulation shows that both the degree of coherence and additive phase shift influence the intensity. For the same partially coherent beam the influence of the coherence degree to intensity increases with the increment of additive phase shift. With a certain additive phase shift the curve of intensity changes obviously when the beam has a larger degree of coherence. The intensity of GSM beam with different additive phase shift changes along with the increment of transmission distance, and finally the intensity of GSM beam with a smaller additive phase shift exceeds the larger one.