1.
Watt-scale 50-MHz source of single-cycle waveform-stable pulses in the molecular fingerprint region.
Opt Lett
; 44(7): 1730-1733, 2019 Apr 01.
Article
in English
| MEDLINE
| ID: mdl-30933133
ABSTRACT
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.