@article{Chen2019-07-22Octav-46668,
  year={2019},
  doi={10.1364/OE.27.021306},
  title={Octave-spanning single-cycle middle-infrared generation through optical parametric amplification in LiGaS<sub>2</sub>},
  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}
}

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    <dcterms:title>Octave-spanning single-cycle middle-infrared generation through optical parametric amplification in LiGaS&lt;sub&gt;2&lt;/sub&gt;</dcterms:title>
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    <dc:contributor>Baum, Peter</dc:contributor>
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    <dc:date rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">2019-08-09T13:35:10Z</dc:date>
    <dc:creator>Morimoto, Yuya</dc:creator>
    <dc:creator>Riedle, Eberhard</dc:creator>
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    <dc:contributor>Chen, Bo-Han</dc:contributor>
    <dc:creator>Wittmann, Emanuel</dc:creator>
    <dc:creator>Baum, Peter</dc:creator>
    <dc:contributor>Wittmann, Emanuel</dc:contributor>
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    <dc:contributor>Riedle, Eberhard</dc:contributor>
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    <dc:creator>Chen, Bo-Han</dc:creator>
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    <dc:contributor>Morimoto, Yuya</dc:contributor>
    <dcterms:abstract xml:lang="eng">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.</dcterms:abstract>
    <dcterms:issued>2019-07-22</dcterms:issued>
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