Zapata L E, Reichert F, Hemmer M, Kärtner F X
Opt Lett. 2016 Feb 1;41(3):492-5. doi: 10.1364/OL.41.000492.
A cryogenically cooled, bulk Yb:YAG, four-pass amplifier delivering up to 250 W average power at 100 kHz repetition rate is reported. The 2.5 mJ amplified optical pulses show a sub-20 ps duration before temporal compression and a spectrum supporting a transform-limited duration of 3.6 ps. The power instabilities were measured to be <0.5% rms over 30 min at full power, and the spatial intensity profile showed a flat-top distribution and near diffraction-limited beam quality. This compact amplifier is an ideal source for pumping either near-IR or mid-IR optical parametric chirped pulse amplifiers.
报道了一种低温冷却的块状镱铝石榴石（Yb:YAG）四程放大器，其在100 kHz重复频率下平均功率可达250 W。2.5 mJ的放大光脉冲在时间压缩前脉宽小于20 ps，光谱支持的变换极限脉宽为3.6 ps。在满功率下30分钟内测量的功率不稳定度均方根值小于0.5%，空间强度分布呈平顶分布，光束质量接近衍射极限。这种紧凑型放大器是泵浦近红外或中红外光学参量啁啾脉冲放大器的理想光源。
