Opt Lett. 2019 Mar 15;44(6):1464-1467. doi: 10.1364/OL.44.001464.
We demonstrate a single-stage, multipass Ti:sapphire amplifier capable of delivering sub-13 fs, 3.2 mJ pulses at a 1 kHz repetition rate. Gaussian filters are used to suppress the gain-narrowing effect, thereby enabling the achievement of an ultrabroadband flat-top spectrum with a >130 . The carrier-envelope phase (CEP) of the output pulses is actively stabilized via the feed-forward scheme (for the oscillator) and a fast 1 kHz f-to-2f interferometer, which corrects the amplifier-induced CEP drift. The single-shot 75 h CEP measurement yielded rms noise of <150 .
我们展示了一种单级、多通钛宝石放大器，能够以 1 kHz 的重复率输出小于 13 fs、3.2 mJ 的脉冲。采用高斯滤波器抑制增益变窄效应，从而实现超宽带平顶光谱，带宽大于 130。通过前馈方案（用于振荡器）和快速的 1 kHz f-2f 干涉仪对输出脉冲的载波包络相位（CEP）进行主动稳定，校正放大器引起的 CEP 漂移。单次 75 h CEP 测量的 rms 噪声小于 150。
