Prepulse-free, multi-terawatt, sub-30-fs laser system.
Prepulse-free, multi-terawatt, sub-30-fs laser system.
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DOI：
10.1364/opex.14.000438
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发表时间：
2006-01
期刊：
影响因子：
3.8
通讯作者：
H. Kiriyama;N. Inoue;Y. Akahane;K. Yamakawa
中科院分区：
文献类型：
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作者：
H. Kiriyama;N. Inoue;Y. Akahane;K. Yamakawa
我们已经建立了一个无预脉冲，多太瓦，超短脉冲激光系统，它结合了传统的激光放大和光参量啁啾脉冲放大（OPCPA）技术。在钛宝石啁啾脉冲放大激光链中，在再生放大器后采用了OPCPA系统，使前脉冲对比度提高了6个数量级。用OPCPA系统输出的重复频率为10 Hz、能量为24 mJ的高能宽带脉冲，测得前脉冲对比度优于4.4 × 10 ~（-11）。采用四程钛宝石放大器，获得了279 mJ的放大能量和23.5fs的超短再压缩放大脉冲宽度，对应于OPCPA和四程放大器的峰值功率分别为0.5TW和5.9TW。
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.