Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Strasse 1, 85748 Garching, Germany.
Opt Lett. 2010 Jun 15;35(12):2052-4. doi: 10.1364/OL.35.002052.
A passive optical resonator is used to enhance the power of a pulsed 78 MHz repetition rate Yb laser providing 200 fs pulses. We find limitations relating to the achievable time-averaged and peak power, which we distinguish by varying the duration of the input pulses. An intracavity average power of 18 kW is generated with close to Fourier-limited pulses of 10 W average power. Beyond this power level, intensity-related effects lead to resonator instabilities, which can be removed by chirping the seed laser pulses. By extending the pulse duration in this way to 2 ps, we could obtain 72 kW of intracavity circulating power with 50 W of input power.
采用无源光谐振腔来增强重复频率为 78MHz 的脉冲 Yb 激光器的功率，从而提供 200fs 脉冲。我们发现与可实现的时间平均功率和峰值功率有关的限制，通过改变输入脉冲的持续时间来区分这些限制。在腔内产生 18kW 的平均功率为 10W 的近傅里叶极限脉冲。超过这个功率水平，强度相关的效应会导致谐振腔不稳定，通过啁啾种子激光脉冲可以消除这些不稳定性。通过以这种方式将脉冲持续时间延长到 2ps，我们可以用 50W 的输入功率获得 72kW 的腔内循环功率。
