Tunable mid-infrared generation via wide-band four-wave mixing in silicon nitride waveguides

Optics Letters
Abijith S KowligyScott A Diddams

Abstract

We demonstrate wide-band frequency down-conversion to the mid-infrared (MIR) using four-wave mixing (FWM) of near-infrared (NIR) femtosecond-duration pulses from an Er:fiber laser, corresponding to 100 THz spectral translation. Photonic-chip-based silicon nitride waveguides provide the FWM medium. Engineered dispersion in the nanophotonic geometry and the wide transparency range of silicon nitride enable large-detuning FWM phase-matching and results in tunable MIR from 2.6 to 3.6 μm on a single chip with 100-pJ-scale pump-pulse energies. Additionally, we observe up to 25 dB broadband parametric gain for NIR pulses when the FWM process is operated in a frequency up-conversion configuration. Our results demonstrate how integrated photonic circuits pumped with fiber lasers could realize multiple nonlinear optical phenomena on the same chip and lead to engineered synthesis of broadband, tunable, and coherent light across the NIR and MIR wavelength bands.

References

Dec 10, 2008·Optics Express·Michael R E LamontBenjamin J Eggleton
Apr 12, 2011·Optics Letters·Ryan K W LauAlexander L Gaeta
Nov 18, 2011·Optics Letters·Bart KuykenWilliam M J Green
May 26, 2012·Optics Letters·Simon LefrancoisFrank W Wise
Aug 1, 2016·The Journal of Chemical Physics·Chih-Hsuan Chang, David J Nesbitt
Jun 15, 2017·Optics Letters·David R CarlsonScott B Papp
Feb 27, 2018·Physical Review Letters·Daniel D HicksteinScott B Papp

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