Efficient middle-infrared generation in LiGaS2 by simultaneous spectral broadening and difference-frequency generation
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作者:
Chen, B-H.
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Ludwig Maximilians Univ Munchen, Coulombwall 1, D-85748 Garching, Germany
Max Planck Inst Quantum Opt, Hans Kopfermann Str 1, D-85748 Garching, GermanyLudwig Maximilians Univ Munchen, Coulombwall 1, D-85748 Garching, Germany
Chen, B-H.
[1
,2
]
Nagy, T.
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Max Born Inst Nonlinear Opt & Short Pulse Spect, Max Born Str 2A, D-12489 Berlin, GermanyLudwig Maximilians Univ Munchen, Coulombwall 1, D-85748 Garching, Germany
Nagy, T.
[3
]
Baum, P.
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Ludwig Maximilians Univ Munchen, Coulombwall 1, D-85748 Garching, Germany
Max Planck Inst Quantum Opt, Hans Kopfermann Str 1, D-85748 Garching, GermanyLudwig Maximilians Univ Munchen, Coulombwall 1, D-85748 Garching, Germany
Baum, P.
[1
,2
]
机构:
[1] Ludwig Maximilians Univ Munchen, Coulombwall 1, D-85748 Garching, Germany
[2] Max Planck Inst Quantum Opt, Hans Kopfermann Str 1, D-85748 Garching, Germany
[3] Max Born Inst Nonlinear Opt & Short Pulse Spect, Max Born Str 2A, D-12489 Berlin, Germany
We report a surprisingly broadband and efficient midin-frared pulse generation in LiGaS2 (Langasite, LGS) by invoking a simultaneous interplay of intrapulse difference-frequency generation, self-phase modulation, and dispersion. This cascaded mechanism expands the output bandwidth and output power at the same time. With 30-fs driving pulses centered at 1030-nm wavelength we obtain a broadband middle-infrared spectrum of 8-11 mu m with an LGS crystal as thick as 4 mm, which is eight times longer than the walk-off length. (C) 2018 Optical Society of America