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Time-resolved measurements on reflectivity of an ultrafast laser-induced plasma mirror

Phys. Plasmas 16, 103104 (2009); doi:10.1063/1.3247865

Published 20 October 2009

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Yi Cai, Wentao Wang, Changquan Xia, Jiansheng Liu, Li Liu, Cheng Wang, Yi Xu, Yuxin Leng, Ruxin Li, and Zhizhan Xu
State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, P. O. Box 800-211, Shanghai 201800, China
Using a linearly chirped laser pulse to irradiate antireflection coated targets, the time-varying reflectivity of a plasma mirror (PM) has been measured at various laser intensities from 1012 to 1017  W/cm2. The onset of plasma generation as well as the formation process of a PM with the highest reflectivity has been observed. The rise time of the PM's reflectivity reaching up to the maximum varies from 300–500 fs at lower laser intensities but goes up to 900 fs at higher intensity of >1016  W/cm2. This long rise time can be attributed to a slowly rising shoulder of the laser pulse, which will trigger the generation of preplasma well in advance of the laser peak. The detailed measurements on both time-integrated and time-resolved reflectivity of a PM, which is induced by p- and s-polarized laser pulses, respectively, indicate that an s-polarized pulse is favorable to obtain the maximal reflectivity and the best contrast improvement as well. This difference can be attributed to the weaker absorption and a smaller plasma scale length generated for s-polarization. ©2009 American Institute of Physics
History: Received 12 May 2009; accepted 23 September 2009; published 20 October 2009
Permalink: http://link.aip.org/link/?PHPAEN/16/103104/1
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KEYWORDS and PACS

Keywords
PACS
  • 52.50.Jm
    Plasma production and heating by laser beams
  • YEAR: 2009

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1070-664X (print)   1089-7674 (online)
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