Nonlinear images of scatterers in chirped pulsed laser beams

• Published in: Chinese physics B Vol. 19; no. 11; pp. 420 - 426
• Main Author: 胡勇华 王友文 文双春 范滇元
• Format: Journal Article
• Language: English
• Published: IOP Publishing 01.11.2010
• Subjects: 带宽和; 数值模拟; 脉冲光束; 脉冲持续时间; 脉冲激光束; 非线性散射; 预啁啾
• ISSN: 1674-1056; 2058-3834
• DOI: 10.1088/1674-1056/19/11/114207

The bandwidth and the duration of incident pulsed beam are proved to play important roles in modifying the nonlinear image of amplitude-type scatterer. It is found that the initially positive chirp-type bandwidth can suppress the nonlinear image, while the negative one can enhance it, and that both effects are inversely proportional to the incident pulse duration. Numerical simulations further demonstrate that the location of nonlinear image is at the conjugate plane of the scatterer and that, for negatively pre-chirped pulsed beam, the nonlinear image peak intensity can be higher than that in the corresponding monochromatic case under certain conditions. Moreover the effect of group velocity dispersion on nonlinear image is found to be similar to that of chirp-type bandwidth.