Röser F, Eidam T, Rothhardt J, Schmidt O, Schimpf D N, Limpert J, Tünnermann A
Friedrich-Schiller-Universität Jena, Institut für Angewandte Physik, Albert-Einstein-Strasse 15, D-07745 Jena, Germany.
Opt Lett. 2007 Dec 15;32(24):3495-7. doi: 10.1364/ol.32.003495.
We report on an ytterbium-doped fiber chirped-pulse amplification (CPA) system delivering millijoule level pulse energy at repetition rates above 100 kHz corresponding to an average power of more than 100 W. The compressed pulses are as short as 800 fs. As the main amplifier, an 80 microm core diameter short length photonic crystal fiber is employed, which allows the generation of pulse energies up to 1.45 mJ with a B-integral as low as 7 at a stretched pulse duration of 2 ns. A stretcher-compressor unit consisting of dielectric diffraction gratings is capable of handling the average power without beam and pulse quality distortions. To our knowledge, we present the highest pulse energy ever extracted from fiber based femtosecond laser systems, and a nearly 2 orders of magnitude higher repetition rate than in previously published millijoule-level fiber CPA systems.
我们报道了一种掺镱光纤啁啾脉冲放大（CPA）系统，该系统在重复频率高于100kHz时可输出毫焦耳级的脉冲能量，对应平均功率超过100W。压缩后的脉冲短至800fs。作为主放大器，采用了芯径为80微米的短长度光子晶体光纤，在2ns的拉伸脉冲持续时间下，可产生高达1.45mJ的脉冲能量，且B积分低至7。由介质衍射光栅组成的展宽器 - 压缩器单元能够在不影响光束和脉冲质量的情况下处理平均功率。据我们所知，我们展示了从基于光纤的飞秒激光系统中提取的有史以来最高的脉冲能量，并且重复频率比之前发表的毫焦耳级光纤CPA系统高出近两个数量级。
