Dissemin is shutting down on January 1st, 2025

Published in

Optica, Optics Letters, 13(45), p. 3677, 2020

DOI: 10.1364/ol.391651

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Mid-infrared frequency combs at 10 GHz

This paper was not found in any repository, but could be made available legally by the author.
This paper was not found in any repository, but could be made available legally by the author.

Full text: Unavailable

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Preprint: archiving allowed
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Postprint: archiving allowed
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Published version: archiving forbidden
Data provided by SHERPA/RoMEO

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 ( ≲ 15 f s , 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 - 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.