Wnuk Paweł, Stepanenko Yuriy, Radzewicz Czesław
Institute of Experimental Physics, Warsaw University, Hoza 69, PL-00-681 Warsaw, Poland.
Opt Express. 2009 Aug 17;17(17):15264-73. doi: 10.1364/oe.17.015264.
We report on a compact and simple, broadband optical parametric chirped pulse amplifier system that amplifies femtosecond pulses directly from a titanium sapphire oscillator up to 2 TW power. Our system relies on a new technique - time shear - that improves the time overlap between the seed and pump pulses and, thus, improves the efficiency of the power amplification stage pumped with a ns laser. Parametric amplification was achieved in two stages: a multipass, noncollinear geometry preamplifier with a single beta-barium borate crystal, and a power booster stage incorporating three beta-barium borate crystals in the new time-shear design. Both stages were pumped with pulses from a commercial 10 Hz frequency doubled ns Nd:YAG laser. The system delivers 49 mJ pulses with a temporal width of 23 fs and its overall conversion efficiency after pulse compression is 10%.
我们报道了一种紧凑且简单的宽带光学参量啁啾脉冲放大器系统，该系统可将来自钛宝石振荡器的飞秒脉冲直接放大至2太瓦的功率。我们的系统依赖于一种新技术——时间剪切，它改善了种子脉冲和泵浦脉冲之间的时间重叠，从而提高了由纳秒激光器泵浦的功率放大阶段的效率。参量放大分两个阶段实现：一个采用单个偏硼酸钡晶体的多程、非共线几何结构前置放大器，以及一个在新的时间剪切设计中包含三个偏硼酸钡晶体的功率增强阶段。两个阶段均由商用10赫兹倍频纳秒钕:钇铝石榴石激光器的脉冲泵浦。该系统输出49毫焦的脉冲，时间宽度为23飞秒，脉冲压缩后的总转换效率为10%。
