Chi Han, Wang Yong, Davenport Aaron, Menoni Carmen S, Rocca Jorge J
Opt Lett. 2020 Dec 15;45(24):6803-6806. doi: 10.1364/OL.412975.
A =515 laser generating joule-level pulses at 1 kHz repetition rate was demonstrated by frequency doubling 1.2 J, 2 ns temporally shaped square pulses from a cryogenically cooled Yb:YAG laser in an LBO crystal. A doubling efficiency of 78% resulted in 0.94 J second-harmonic pulses at 1 kHz. The unconverted light interacted with a second LBO crystal to generate >100 second-harmonic pulses to reach a total green average power of 1.04 kW. A conversion efficiency of 89% was achieved for 0.58 J green pulses at 1 kHz. These results open the possibility to pump high energy femtosecond lasers at kilohertz repetition rates.
通过在LBO晶体中对低温冷却的Yb:YAG激光器产生的1.2 J、2 ns时间整形的方脉冲进行倍频，展示了一台重复频率为1 kHz、能产生焦耳级脉冲的515 nm激光器。78%的倍频效率产生了重复频率为1 kHz、能量为0.94 J的二次谐波脉冲。未转换的光与第二个LBO晶体相互作用，产生了超过100个二次谐波脉冲，使绿色光的总平均功率达到1.04 kW。对于重复频率为1 kHz、能量为0.58 J的绿色脉冲，实现了89%的转换效率。这些结果为以千赫兹重复频率泵浦高能量飞秒激光器开辟了可能性。
