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        Nonlinear Increase of Spatial Noise for Ultrashort Pulses with Different Temporal Widths

        Lifu Zhang,Xiquan Fu,Jianqin Deng,Hua Yang,Youwen Wang,Shuangchun Wen,Huiwen Xu,Jinggui Zhang,Jin Zhang,Dianyuan Fan 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.55 No.2

        In this paper, the dynamic evolution of the spatial noise modulation of ultrashort laser pulses in carbon disulfide (CS2) is investigated experimentally, and different temporal widths of the stretched pulse are analyzed for spatial noise gain. The spatial noise evolution (i.e., small-scale self-focusing) of ultrashort laser pulses with different temporal widths as a function of the length of the CS2 has been observed. If the spectral bandwidth is invariant, the experimental results show that a stretched pulse with a broader temporal width can postpone the small-scale self-focusing of spatial noise for longer medium length with constant input power or for greater input power with the same medium length. In this paper, the dynamic evolution of the spatial noise modulation of ultrashort laser pulses in carbon disulfide (CS2) is investigated experimentally, and different temporal widths of the stretched pulse are analyzed for spatial noise gain. The spatial noise evolution (i.e., small-scale self-focusing) of ultrashort laser pulses with different temporal widths as a function of the length of the CS2 has been observed. If the spectral bandwidth is invariant, the experimental results show that a stretched pulse with a broader temporal width can postpone the small-scale self-focusing of spatial noise for longer medium length with constant input power or for greater input power with the same medium length.

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