title: Temporal contrast enhancement of petawatt-class laser pulses.
abstract: 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.
authors: Kansai Photon Science Institute, Japan Atomic Energy Agency, Kizugawa, Kyoto, Japan. kiriyama.hiromitsu@jaea.go.jp
authors: Hiromitsu
authors: H
authors: Kiriyama
authors: Takuya
authors: T
authors: Shimomura
authors: Hajime
authors: H
authors: Sasao
authors: Yoshiki
authors: Y
authors: Nakai
authors: Manabu
authors: M
authors: Tanoue
authors: Shuji
authors: S
authors: Kondo
authors: Shuhei
authors: S
authors: Kanazawa
authors: Alexander S
authors: AS
authors: Pirozhkov
authors: Michiaki
authors: M
authors: Mori
authors: Yuji
authors: Y
authors: Fukuda
authors: Mamiko
authors: M
authors: Nishiuchi
authors: Masaki
authors: M
authors: Kando
authors: Sergei V
authors: SV
authors: Bulanov
authors: Keisuke
authors: K
authors: Nagashima
authors: Mitsuru
authors: M
authors: Yamagiwa
authors: Kiminori
authors: K
authors: Kondo
authors: Akira
authors: A
authors: Sugiyama
authors: Paul R
authors: PR
authors: Bolton
authors: T
authors: T
authors: Tajima
authors: Noriaki
authors: N
authors: Miyanaga