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Butler, T. P.; Gerz, D.; Hofer, C.; Xu, J.; Gaida, C.; Heuermann, T.; Gebhardt, M.; Vamos, L.; Schweinberger, W.; Gessner, J. A.; Siefke, T.; Heusinger, M.; Zeitner, U.; Apolonski, A.; Karpowicz, N.; Limpert, J.; Krausz, Ferenc ORCID logoORCID: https://orcid.org/0000-0002-6525-9449 and Pupeza, I (2019): Watt-scale 50-MHz source of single-cycle waveform-stable pulses in the molecular fingerprint region. In: Optics Letters, Vol. 44, No. 7: pp. 1730-1733

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Abstract

We report a coherent mid-infrared (MIR) source with a combination of broad spectral coverage (6-18 mu m), high repetition rate (50 MHz), and high average power (0.5 W). The waveform-stable pulses emerge via intrapulse difference-frequency generation (IPDFG) in a GaSe crystal, driven by a 30-W average-power train of 32-fs pulses spectrally centered at 2 mu m, delivered by a fiber-laser system. Electro-optic sampling (EOS) of the waveform-stable MIR waveforms reveals their single-cycle nature, confirming the excellent phase matching both of IPDFG and of EOS with 2-mu m pulses in GaSe. (C) 2019 Optical Society of America

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