title: Silver-mirror-based multipass preamplifier for a broadband terawatt Ti:sapphire laser.
abstract: We have developed a silver-mirror-based multipass preamplifier for a broadband amplification in a terawatt Ti:sapphire laser. With the extremely broad bandwidth of the silver mirrors, a very broad amplified spectrum can be generated at an amplified energy of 4 mJ; the amplified spectral width is 65 nm at half maximum and 160 nm at -25 dB without any spectral shaping technique. Such a broad amplification can be explained well by the simulation that includes gain narrowing and gain saturation. Even after a further amplification to an energy of 600 mJ, the amplified spectrum is broad enough to support an approximately 20 fs transform-limited pulse duration.
authors.affiliation: Quantum Optics Center, Korea Atomic Energy Research Institute, 1045 Daedeok Street Yuseong-gu, Daejon 305-353, Korea. ex-ywlee@kaeri.re.kr
authors.forename: Y W
authors.initials: YW
authors.lastname: Lee
authors.forename: Y H
authors.initials: YH
authors.lastname: Cha
authors.forename: J H
authors.initials: JH
authors.lastname: Yi
authors.forename: S M
authors.initials: SM
authors.lastname: Nam
authors.forename: K
authors.initials: K
authors.lastname: Lee
authors.forename: Y J
authors.initials: YJ
authors.lastname: Rhee
authors.forename: Y U
authors.initials: YU
authors.lastname: Jeong
authors.forename: H K
authors.initials: HK
authors.lastname: Cha