Tian Wenlong, Wang Zhaohua, Zhu Jiangfeng, Wei Zhiyi
Opt Express. 2016 Dec 26;24(26):29814-29821. doi: 10.1364/OE.24.029814.
We report a multi-gigahertz (GHz) repetition-rate femtosecond MgO:PPLN optical parametric oscillator (OPO) harmonically pumped by a 75.6 MHz Kerr-lens mode-locked Yb:KGW laser. By fractionally increasing the OPO cavity length, we obtained OPO operation up to the 493rd harmonic of the pump laser repetition rate, corresponding to a repetition rate as high as 37.3 GHz. Using a 1.5% output coupler, we are able to extract signal pulses with up to 260 mW average power at the 102nd harmonic (7.7 GHz) and 90 mW at the 493rd harmonic (37.3 GHz) under 2 W pump power. The measured relative standard deviations of the fundamental and the 102nd harmonic signal power were recorded to be 0.5% and 2.1%, respectively. The signal pulse durations at different harmonics were measured in the range of 160-230 fs.
我们报道了一种由75.6 MHz克尔透镜锁模Yb:KGW激光器谐波泵浦的多吉赫兹（GHz）重复频率飞秒MgO:PPLN光学参量振荡器（OPO）。通过部分增加OPO腔长度，我们实现了高达泵浦激光重复频率第493次谐波的OPO运转，对应高达37.3 GHz的重复频率。使用1.5%的输出耦合器，在2 W泵浦功率下，我们能够在第102次谐波（7.7 GHz）提取平均功率高达260 mW的信号脉冲，在第493次谐波（37.3 GHz）提取90 mW的信号脉冲。测量得到基波和第102次谐波信号功率的相对标准偏差分别为0.5%和2.1%。不同谐波处的信号脉冲持续时间在160 - 230 fs范围内测量。
