Spatio-temporal characterization of double plasma mirror for ultrahigh contrast and stable laser pulse |
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Authors: | IJ Kim I W Choi S K Lee K A Janulewicz J H Sung T J Yu H T Kim H Yun T M Jeong J Lee |
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Institution: | 1.Center for Femto-Atto Science and Technology, Advanced Photonics Research Institute,GIST,Gwangju,Korea;2.Department of Physics,KAIST,Daejeon,Korea |
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Abstract: | An ultrahigh contrast laser pulse of over 1011 for 6 ps before the main pulse was achieved by employing a double plasma mirror installed at the end of a 100 TW Ti:sapphire
laser system. Spatial beam qualities such as focusability and stability were found to be extremely sensitive in the range
of 14–360 J/cm2 on the double plasma mirror, while ultrahigh contrast was maintained. At the fluence of 90 J/cm2 the focusability of the ultrahigh contrast laser was not degraded, and the stability was very close to that obtained without
the double plasma mirror when the 2-dimensional normalized standard deviation and the correlation function for several laser
beam profiles were analyzed. These results are requisites for carrying out relativistic laser-plasma interactions with ultrahigh
contrast laser pulses, enabling the use of ultrathin solid targets. |
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