We report on the first, to the best of our knowledge, LED-pumped femtosecond regenerative amplifier. It is based on a Cr:LiSAF crystal pumped by 2240 blue LEDs via a Ce:YAG luminescent concentrator. The amplifier was seeded by pulses from a Ti:sapphire oscillator at 835 nm temporally stretched from 90 fs to 100 ps. At the output of the regenerative amplifier, we obtain 1 mJ pulse energy at a 10 Hz repetition rate, given by the frequency of the LED-pumping module. After compression, we obtain 100 fs pulses with a spectral bandwidth of 10 nm at 835 nm.

中文翻译：

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LED泵浦飞秒Cr：LiSAF再生放大器系统

据我们所知，第一个报告的是LED泵浦的飞秒再生放大器。它基于Cr：LiSAF晶体，通过Ce：YAG发光集中器由2240个蓝色LED泵浦。该放大器是由来自Ti：蓝宝石振荡器的835 nm脉冲播种的，该脉冲在时间上从90 fs扩展到100 ps。在再生放大器的输出端，我们以10 Hz的重复频率获得1 mJ脉冲能量，该频率由LED泵浦模块的频率给定。压缩后，我们在835 nm处获得100 fs脉冲，其光谱带宽为10 nm。