Kiriyama Hiromitsu, Inoue Norihiro, Akahane Yutaka, Yamakawa Koichi
Opt Express. 2006 Jan 9;14(1):438-45. doi: 10.1364/opex.14.000438.
We have built a prepulse-free, multi-terawatt, ultrashort pulse laser system, which combines both conventional laser amplification and optical parametric chirped pulse amplification (OPCPA) techniques. By employing an OPCPA system after the regenerative amplifier in a Ti:sapphire chirped pulse amplification laser chain, we have dramatically enhanced the prepulse contrast by 6 orders of magnitude. A prepulse contrast of better than 4.4 x 10-11 has been measured with a high energy broadband pulse of 24 mJ at 10 Hz repetition rate from the OPCPA system. Using a subsequent four-pass Ti:sapphire amplifier, we have achieved an amplified energy of 279 mJ and an ultrashort recompressed amplified pulse duration of 23.5 fs, corresponding to the peak powers for OPCPA and four-pass amplifier of 0.5 TW and 5.9 TW, respectively.
我们构建了一个无预脉冲、多太瓦级的超短脉冲激光系统，该系统结合了传统激光放大和光学参量啁啾脉冲放大（OPCPA）技术。通过在钛宝石啁啾脉冲放大激光链中的再生放大器之后采用一个OPCPA系统，我们已将预脉冲对比度显著提高了6个数量级。从该OPCPA系统以10 Hz重复频率获得的24 mJ高能宽带脉冲测得的预脉冲对比度优于4.4×10⁻¹¹。使用后续的四程钛宝石放大器，我们实现了279 mJ的放大能量以及23.5 fs的超短再压缩放大脉冲持续时间，对应于OPCPA和四程放大器的峰值功率分别为0.5 TW和5.9 TW。
