由1.4 ps Yb:YAG薄片激光器驱动的白光种子、CEP稳定、4.5 W、4微米KTA参量放大器
White-light-seeded, CEP-stable, 4.5-W, 4-micron KTA parametric amplifier driven by a 1.4-ps Yb:YAG thin disk laser
AI总结：
本研究利用1.4 ps Yb:YAG薄片激光器驱动基于KTA的光参量放大器，实现长脉冲下超连续谱种子稳定产生，得到CEP稳定的高功率中红外脉冲，并验证了其在高次谐波产生中的应用潜力。
摘要：
我们展示了一种稳定的、载波包络相位（CEP）稳定的、基于钛氧砷酸钾（KTA）的光参量放大器（OPA），其以100 kHz重复频率输出6个周期（79 fs）、3.8 μm的脉冲，平均功率为4.5 W。关键成果是在YAG晶体中利用1.4 ps的较长脉冲稳定产生超连续谱（SC）种子脉冲；据我们所知，这是超连续谱产生（SCG）所用的最长脉冲持续时间。该技术提供了一种稳定且简化的OPA架构，具有CEP被动稳定、采用块状材料简化色散管理、输出脉冲波长在1.3-4.5 μm范围内可调、以及未来可基于Yb:YAG薄片放大器将功率提升至kW级的特点。实现了17 W的总输出功率（信号光加闲频光），并通过将其应用于ZnSe晶体中的高次谐波产生（HHG），相继验证了这种高光子通量的能力，借此清晰观测到了其带隙以上微弱但新颖的信号。
英文摘要：
We demonstrate a robust, carrier envelope phase (CEP)-stable, potassium titanyl arsenate (KTA)-based optical parametric amplifier (OPA) delivering 6-cycle (79 fs), 3.8-$μ$m pulses at a 100-kHz repetition rate with an average power of 4.5 W. The pivotal achievement is stable generation of supercontinuum (SC) seed pulses in a YAG crystal with a rather long pulse of 1.4 ps; to our knowledge, this is the longest duration for SC generation (SCG). This technology offers a robust and simplified OPA architecture with characteristics of passively-stabilized CEP, simplified dispersion management with bulk materials, wavelength tunability of the output pulses from 1.3-4.5 $μ$m, and the future power scaling up to kW-class based on Yb:YAG thin disk amplifiers. The total output power of 17 W (signal plus idler) is achieved and the capability of this high photon flux aspect is successively demonstrated by its application to high harmonic generation (HHG) in ZnSe crystals, with which faint yet novel signals above their bandgap are clearly observed.
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