Gao Guanguang, Song Jiajun, Peng Yujie, Shen Liya, Zhu Junze, Liu Yinfei, Leng Yuxin
Opt Express. 2024 Dec 30;32(27):48934-48942. doi: 10.1364/OE.546769.
We demonstrate a dual-crystal Yb:YAG bulk regenerative amplifier that delivers a hundred-watt average power and millijoule-class pulse energy. The repetition rate of the presented laser is tunable from 50 kHz to 300 kHz, with the highest pulse energy and laser power of 1.9 mJ and 108.9 W, respectively. This presents the highest average power we know of for a single-stage Yb:YAG bulk picosecond laser. Profiting from thermally insensitive dual-crystal regenerative cavity design and the exceptional thermomechanical properties of the Yb:YAG crystals, both the amplification efficiency and beam quality barely deteriorated as pump power increased. The compressed spectral bandwidth and pulse duration are 1.02 nm and 1.45 ps, respectively, with a compression efficiency of 92.7%. The presented laser source could be employed as the pre-pulse for extreme ultraviolet pump source for optical parametric chirped pulse amplifier, or as the front end for high-power thin-disk/Inno-slab lasers.
我们展示了一种双晶体Yb:YAG体再生放大器，其平均功率可达百瓦级，脉冲能量为毫焦级。所展示的激光器的重复频率可在50千赫兹至300千赫兹之间调谐，最高脉冲能量和激光功率分别为1.9毫焦和108.9瓦。这是我们所知的单级Yb:YAG体皮秒激光器的最高平均功率。受益于热不敏感的双晶体再生腔设计以及Yb:YAG晶体优异的热机械性能，随着泵浦功率的增加，放大效率和光束质量几乎没有恶化。压缩后的光谱带宽和脉冲持续时间分别为1.02纳米和1.45皮秒，压缩效率为92.7%。所展示的激光源可用作光学参量啁啾脉冲放大器的极紫外泵浦源的预脉冲，或用作高功率薄片/Innolab激光器的前端。
