Nonlinear images of scatterers in chirped pulsed laser beams

doi:10.1088/1674-1056/19/11/114207

Abstract 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.

Keywords: pulsed laser beam nonlinear propagation nonlinear image self-focusing

Received: 24 November 2009
Revised: 24 May 2010
Accepted manuscript online:

PACS:	42.30.-d	(Imaging and optical processing)
	42.60.Jf	(Beam characteristics: profile, intensity, and power; spatial pattern formation)
	42.65.Re	(Ultrafast processes; optical pulse generation and pulse compression)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 60890202 and 10974049).

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Hu Yong-Hua(胡勇华), Wang You-Wen(王友文), Wen Shuang-Chun(文双春), and Fan Dian-Yuan(范滇元) Nonlinear images of scatterers in chirped pulsed laser beams 2010 Chin. Phys. B 19 114207

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Nonlinear images of scatterers in chirped pulsed laser beams

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