Zhang Xiaoshi, Schneider Eric, Taft Greg, Kaptyen Henry, Murnane Margaret, Backus Sterling
Kapteyn-Murnane Laboratories Inc., 1855 S 57th Ct, Boulder, Colorado 80301, USA.
Opt Express. 2012 Mar 26;20(7):7015-21. doi: 10.1364/OE.20.007015.
We demonstrate a cryogenically cooled Ti:sapphire ultrafast regenerative amplifier laser system producing >20 μJ energies at 50 kHz, >12 μJ at 200 kHz and >3.5 μJ at 1MHz with repetition rates continuously tunable from 50 kHz up to 1.7 MHz in a footprint of only 60x180 cm². This laser uses down-chirped pulse amplification employing a grism stretcher and a glass-block compressor, achieving sub-60-fs pulse duration. This laser represents a several-times improvement in repetition-rate and average power over past Ti:sapphire-based ultrafast lasers in this class. We discuss the unique challenges and solutions for this laser system. This laser system has wide applications especially in ultrafast photoemission, nonlinear imaging and spectroscopy, as well as for micro/nano-machining and ultrafast laser therapy and surgery.
我们展示了一种低温冷却的钛宝石超快再生放大器激光系统，该系统在50kHz时能产生大于20μJ的能量，在200kHz时大于12μJ，在1MHz时大于3.5μJ，重复频率可在50kHz至1.7MHz之间连续调谐，占地面积仅为60×180平方厘米。该激光器采用了利用棱栅展宽器和玻璃块压缩器的负啁啾脉冲放大技术，实现了亚60飞秒的脉冲持续时间。与该类过去基于钛宝石的超快激光器相比，此激光器在重复频率和平均功率方面有了几倍的提升。我们讨论了该激光系统面临的独特挑战及解决方案。该激光系统具有广泛的应用，特别是在超快光发射、非线性成像和光谱学领域，以及微纳加工、超快激光治疗和手术方面。
