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Influence of Initial Pulse Chirp on Rainbow-Like Supercontinuum Generation from Filamentation in Air |
HAO Zuo-Qiang1,2;ZHANG Jie1,3,ZHANG Zhe1;LU Xin1;JIN Zhan1;ZHONG Jia-Yong1;LIU Yun-Quan1;WANG Zhao-Hua1 |
1Beijing National Laboratory for Condensed Matter Physics,Institute of Physics, Chinese Academy of Sciences, Beijing 1000802Laboratoire de Spectrometrie Ionique et Moleculaire, UMR CNRS 5579, Universite Claude Bernard Lyon 1, 43, Bd. du 11 Novembre 1918, F-69622 Villeurbanne Cedex, France3Department of Physics, Shanghai Jiao Tong University, Shanghai 200240 |
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Cite this article: |
HAO Zuo-Qiang, ZHANG Jie, ZHANG Zhe et al 2008 Chin. Phys. Lett. 25 1365-1367 |
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Abstract Supercontinuum (SC) generation from laser filamentation in air is found to depend strongly on the pulse duration. Rainbow-like SC generation is observed only for a pulse of appropriate negative chirp that agrees with the predictions put forward by Golubtsov it et al. [it Quantum Electron. 33 (2003) 525]. The conversion efficiency of an 800-nm laser light to rainbow-like SC is found to be the highest for 257fs pulses with an initial negative chirp. A larger chirp will lead to filamentation surviving at longer distance.
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Keywords:
52.38.Hb
42.65.Jx
42.65.Ky
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Received: 03 September 2007
Published: 31 March 2008
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PACS: |
52.38.Hb
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(Self-focussing, channeling, and filamentation in plasmas)
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42.65.Jx
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(Beam trapping, self-focusing and defocusing; self-phase modulation)
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42.65.Ky
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(Frequency conversion; harmonic generation, including higher-order harmonic generation)
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