17 May 2010 Temporal intensity contrast ratio enhancement of petawatt level laser pulses based on second harmonic generation
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Abstract
Theoretical investigation of second harmonic generation (SHG) of super intense femtosecond radiation demonstrated that temporal Intensity Contrast Ratio (ICR) of output radiation of petawatt level laser complexes can be significantly increased. The cubic polarization effects in the process give possibility of additional pulse compression. We present experimental results of SHG of radiation with average intensity 2TW/cm2 in 0.6mm KDP crystal. Theoretical model of linear regime of plane wave instability in mediums with quadratic and cubic nonlinearity is developed and thoroughly discussed. Analysis of small-scale self-focusing suppression methodic is presented. The influence of surface dust to spatial noises generation in SHG process is pointed out.
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Sergey Mironov, Sergey Mironov, Vladimir Lozhkarev, Vladimir Lozhkarev, Vladislav Ginzburg, Vladislav Ginzburg, Ivan Yakovlev, Ivan Yakovlev, Grigory Luchinin, Grigory Luchinin, Efim Khazanov, Efim Khazanov, Alexander Sergeev, Alexander Sergeev, Gerard Mourou, Gerard Mourou, "Temporal intensity contrast ratio enhancement of petawatt level laser pulses based on second harmonic generation", Proc. SPIE 7721, Solid State Lasers and Amplifiers IV, and High-Power Lasers, 77211R (17 May 2010); doi: 10.1117/12.854156; https://doi.org/10.1117/12.854156
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