Small-scale self-focusing of divergent beam in nonlinear media with loss |
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Authors: | Yanli Zhang Xiaoyan Li Yan Zhang Pingping Sun Jianqiang Zhu |
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Affiliation: | Yanli Zhang~*,Xiaoyan Li,Yan Zhang Pingping Sun,, Jianqiang Zhu Shanghai Institute of Optics , Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800,China |
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Abstract: | Bespalov-Talanov theory on small-scale self-focusing is extended to include medium loss for a divergent beam.Gain spectrum of small-scale perturbation is presented in integral form,and based on the derived equations we find that the cutoff spatial frequency for perturbation keeps a constant value.The larger the medium loss is,the smaller the fastest growing frequency and the maximum gain of perturbation with defined propagation distance are.For a given medium loss the maximum gain of perturbation becomes la... |
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