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Abstract
We demonstrate mid-infrared (MIR) frequency combs at 10 GHz repetition rate via intra-pulse difference-frequency generation (DFG) in quasi-phase-matched nonlinear media. Few-cycle pump pulses (${\lesssim} 15\;{\rm fs} $, 100 pJ) from a near-infrared electro-optic frequency comb are provided via nonlinear soliton-like compression in photonic-chip silicon-nitride waveguides. Subsequent intra-pulse DFG in periodically poled lithium niobate waveguides yields MIR frequency combs in the 3.1–4.8 µm region, while orientation-patterned gallium phosphide provides coverage across 7–11 µm. Cascaded second-order nonlinearities simultaneously provide access to the carrier–envelope-offset frequency of the pump source via in-line $f {\text -} {2\!f}$ nonlinear interferometry. The high-repetition rate MIR frequency combs introduced here can be used for condensed phase spectroscopy and applications such as laser heterodyne radiometry.
© 2020 Optical Society of America
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