This study develops a Yb:KGW dual-crystal based regenerative amplifier. The thermal lensing and gain-narrowing effects are compensated by the dual-crystal configuration. Sub-nanojoule pulses are amplified to 1.5 mJ with 9 nm spectral bandwidth and 1 kHz repetition rate using chirped pulse amplification technology. Consequently, 1.2 mJ pulses with a pulse duration of 227 fs are obtained after compression. Thanks to the cavity design, the output laser was a near diffraction limited beam with M2 around 1.1. The amplifier has the potential to boost energy above 2 mJ after compression and act as a front end for a future kilohertz terawatt-class diode-pumped Yb:KGW laser system.

中文翻译：

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A Yb:KGW双晶再生放大器

本研究开发了一种基于 Yb:KGW 双晶的再生放大器。热透镜效应和增益变窄效应由双晶结构补偿。使用啁啾脉冲放大技术将亚纳焦耳脉冲放大至 1.5 mJ，光谱带宽为 9 nm，重复频率为 1 kHz。因此，压缩后获得 1.2 mJ 脉冲，脉冲持续时间为 227 fs。由于腔体设计，输出激光是近衍射限制光束米21.1左右。该放大器有可能在压缩后将能量提高到 2 mJ 以上，并作为未来千赫太瓦级二极管泵浦 Yb:KGW 激光系统的前端。