Fuertjes Pia, von Grafenstein Lorenz, Ueberschaer Dennis, Mei Chao, Griebner Uwe, Elsaesser Thomas
Opt Lett. 2021 Apr 1;46(7):1704-1707. doi: 10.1364/OL.419956.
A compact mid-wavelength infrared (MWIR) optical parametric chirped pulse amplification (OPCPA) system generates sub-150 fs pulses at wavelengths from 5.4 to 6.8 µm with >400µ energy at a 1 kHz repetition rate. A femtosecond Cr:ZnS master oscillator emitting 40 fs pulses at 2.4 µm seeds both a Ho:YLF regenerative amplifier and a two-stage OPCPA based on crystals. The 2.05 µm few-picosecond pump pulses from the Ho:YLF amplifier have an energy of 13.4 mJ. Seed pulses for the OPCPA are generated by soliton self-frequency shifting in a fluoride fiber and are tunable between 2.8 and 3.25 µm with a sub-100 fs duration and few-nanojoule energy. The intense MWIR pulses hold strong potential for applications in ultrafast mid-infrared nonlinear optics and spectroscopy.
一种紧凑型中波长红外（MWIR）光学参量啁啾脉冲放大（OPCPA）系统，在1 kHz重复频率下，能产生波长范围为5.4至6.8 µm、能量大于400 µJ、脉宽小于150 fs的脉冲。一个飞秒Cr:ZnS主振荡器在2.4 µm波长处发射40 fs脉冲，为一个Ho:YLF再生放大器和一个基于 晶体的两级OPCPA提供种子光。Ho:YLF放大器产生的2.05 µm、几皮秒的泵浦脉冲能量为13.4 mJ。OPCPA的种子脉冲通过氟化物光纤中的孤子自频移产生，脉宽小于100 fs，能量为几纳焦，波长可在2.8至3.25 µm之间调谐。强MWIR脉冲在超快中红外非线性光学和光谱学应用中具有巨大潜力。
