Modeling of nonlinear responses in BK7 glass under irradiation of femtosecond laser pulses
Modeling of nonlinear responses in BK7 glass under irradiation of femtosecond laser pulses
复制标题
DOI：
10.1007/s11082-009-9321-2
复制
发表时间：
2009-07
影响因子：
3
通讯作者：
K. Jamshidi-Ghaleh;H. Masalehdan
中科院分区：
文献类型：
--
作者：
K. Jamshidi-Ghaleh;H. Masalehdan
本文利用透射测量方法研究了 BK7 玻璃样品在 800 nm 波长 200 fs 激光脉冲照射下的非线性响应。当入射脉冲能量高于 37μJ 时，观察到非线性传输。提出了基于同时吸收一、二和三光子吸收的理论模型。模型中还包括自由载流子吸收的贡献。微分方程通过解析求解。实验结果与理论模型预测吻合较好。报告了三光子吸收系数和自由载流子吸收截面的值。
In this paper, the nonlinear response in BK7 glass sample is investigated under irradiation of 200 fs laser pulses at 800 nm wavelength by using of transmission measurement method. Nonlinear transmission is observed for incident pulse energies above 37μJ. A theoretical model based on simultaneously absorption of one, two and three-photon absorption is presented. The contribution of free-carriers absorption is also included on the model. The differential equation is solved analytically. The experimental results and predictions of theoretical model are in good agreement. The values of three-photon absorption coefficient and free-carriers absorption cross-section are reported.