摘要
分析了高功率超高斯光束在非线性介质中传播的基本理论,用分步傅里叶变换方法计算了10阶超高斯光束在非线性介质内的传输过程,最后采用具有负折射率系数的非线性介质作为补偿材料,对不同的补偿方式进行了对比分析。研究表明,四种补偿方式均可以大大减小光束的B积分,有效防止超高斯光束边缘的非线性增长,降低光束的小尺度自聚焦,同时选用后补偿作为最佳补偿方式。
The basic theory of a beam passing through the nonlinear medium is analysed in this paper, and the process of a ten-step high power supper-Gaussion beam passing through the nonlinear medium is calculated with the FFT. A negative nonlinear refractive index material was used as the compensating medium to compare different compensation methods. Studies suggest compensation can decrease B integral along the beam direction in a nonlinear medium, and can cancel the self-focusing of beams greatly. It can also avoid the nonlinear increase on the edges of super-Gaussian beams effectively. The compensation after nonlinear medium was selected as the idea compensating methods.
出处
《强激光与粒子束》
EI
CAS
CSCD
北大核心
2004年第3期291-295,共5页
High Power Laser and Particle Beams
基金
中国工程物理研究院 国家自然科学基金委联合基金资助课题(10176019)
关键词
非线性补偿
超高斯光束
B积分
小尺度自聚焦
Nonlinear compensation
Super-Gaussian beams
B integral
Small-scale self-focusing
