Temporal Contrast Enhancement of Petawatt-Class Laser Pulses.

Hiromitsu Kiriyama,Takuya Shimomura,Hajime Sasao,Yoshiki Nakai,Manabu Tanoue,Shuji Kondo,Shuhei Kanazawa,Alexander S. Pirozhkov,Michiaki Mori,Yuji Fukuda,Mamiko Nishiuchi,Masaki Kando,Sergei V. Bulanov,Keisuke Nagashima,Mitsuru Yamagiwa,Kiminori Kondo,Akira Sugiyama,Paul R. Bolton,T. Tajima, Noriaki Miyanaga

Optics letters/Optics index（2012）

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摘要

We demonstrate the temporal contrast enhancement in a petawatt-class Ti:sapphire chirped-pulse amplification (CPA) laser system. An extra saturable absorber, introduced downstream after a low-gain optical parametric chirped-pulse amplification (OPCPA) preamplifier, has improved the temporal contrast in the system to 1.4×10(12) on the subnanosecond time scale at 70 TW power level. We have achieved 28 J of uncompressed broadband output energy with this system, indicating the potential for reaching peak powers near 600 TW.

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