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Octave-spanning single-cycle middle-infrared generation through optical parametric amplification in LiGaS<sub>2</sub>

Octave-spanning single-cycle middle-infrared generation through optical parametric amplification in LiGaS2

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CHEN, Bo-Han, Emanuel WITTMANN, Yuya MORIMOTO, Peter BAUM, Eberhard RIEDLE, 2019. Octave-spanning single-cycle middle-infrared generation through optical parametric amplification in LiGaS2. In: Optics Express. 27(15), pp. 21306-21318. eISSN 1094-4087. Available under: doi: 10.1364/OE.27.021306

@article{Chen2019-07-22Octav-46668, title={Octave-spanning single-cycle middle-infrared generation through optical parametric amplification in LiGaS2}, year={2019}, doi={10.1364/OE.27.021306}, number={15}, volume={27}, journal={Optics Express}, pages={21306--21318}, author={Chen, Bo-Han and Wittmann, Emanuel and Morimoto, Yuya and Baum, Peter and Riedle, Eberhard} }

Morimoto, Yuya Riedle, Eberhard Morimoto, Yuya Wittmann, Emanuel We report the generation of extremely broadband and inherently phase-locked mid-infrared pulses covering the 5 to 11 µm region. The concept is based on two stages of optical parametric amplification starting from a 270-fs Yb:KGW laser source. A continuum seeded, second harmonic pumped pre-amplifier in β-BaB2O4 (BBO) produces tailored broadband near-infrared pulses that are subsequently mixed with the fundamental pump pulses in LiGaS2 (LGS) for mid-infrared generation and amplification. The pulse bandwidth and chirp is managed entirely by selected optical filters and bulk material. We find an overall quantum efficiency of 1% and a mid-infrared spectrum smoothly covering 5-11 µm with a pulse energy of 220 nJ at 50 kHz repetition rate. Electro-optic sampling with 12-fs long white-light pulses directly from self-compression in a YAG crystal reveals near-single-cycle mid-infrared pulses (32 fs) with passively stable carrier-envelope phase. Such pulses will be ideal for producing attosecond electron pulses or for advancing molecular fingerprint spectroscopy. eng Octave-spanning single-cycle middle-infrared generation through optical parametric amplification in LiGaS<sub>2</sub> Wittmann, Emanuel terms-of-use Riedle, Eberhard 2019-07-22 2019-08-09T13:35:10Z Baum, Peter 2019-08-09T13:35:10Z Chen, Bo-Han Chen, Bo-Han Baum, Peter

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