title: Contrast enhancement in a Ti:sapphire chirped-pulse amplification laser system with a noncollinear femtosecond optical-parametric amplifier.
abstract: We experimentally demonstrated the contrast enhancement in a Ti:sapphire chirped-pulse amplification (CPA) laser with a noncollinear femtosecond optical-parametric amplifier. A total gain of 3.4 × 10(4) and pulse energy of 26 μJ were achieved. With the clean high-energy seeding pulse, the contrast ratio of the main amplified laser pulse to the amplified spontaneous emission in the Ti: sapphire CPA laser system was improved to around 10(10) within the time scale of hundreds of picoseconds.
authors.affiliation: Institute of Physics, Chinese Academy of Sciences, Beijing National Laboratory for Condensed Matter Physics, Beijing 100190, China.
authors.forename: Cheng
authors.initials: C
authors.lastname: Liu
authors.forename: Zhaohua
authors.initials: Z
authors.lastname: Wang
authors.forename: Weichang
authors.initials: W
authors.lastname: Li
authors.forename: Qing
authors.initials: Q
authors.lastname: Zhang
authors.forename: Hainian
authors.initials: H
authors.lastname: Han
authors.forename: Hao
authors.initials: H
authors.lastname: Teng
authors.forename: Zhiyi
authors.initials: Z
authors.lastname: Wei