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Watt-scale 50-MHz source of single-cycle waveform-stable pulses in the molecular fingerprint region

: 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, F.; Pupeza, I.

Fulltext ()

Optics Letters 44 (2019), No.7, pp.1730-1733
ISSN: 0146-9592
Journal Article, Electronic Publication
Fraunhofer IOF ()

We report a coherent mid-infrared (MIR) source with a combination of broad spectral coverage (6–18 μm), 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 μm, 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-μm pulses in GaSe.