Ultra-broadband mid-infrared generation in dispersion-engineered thin-film lithium niobate

Abstract

Thin-film lithium niobate (TFLN) is an emerging platform for compact, low-power nonlinear-optical devices, and has been used extensively for near-infrared frequency conversion. Recent work has extended these devices to mid-infrared wavelengths, where broadly tunable sources may be used for chemical sensing. To this end, we demonstrate efficient and broadband difference frequency generation between a fixed 1-micron pump and a tunable telecom source in uniformly-poled TFLN-on-sapphire by harnessing the dispersion-engineering available in tightly-confining waveguides. We show a simultaneous 1-2 order-of-magnitude improvement in conversion efficiency and ~5-fold enhancement of operating bandwidth for mid-infrared generation when compared to conventional lithium niobate waveguides. We also examine the effects of mid-infrared loss from surface-adsorbed water on the performance of these devices.

5 pages, 4 figures

References in corpus (5)

• Intense optical parametric amplification in dispersion engineered nanophotonic lithium niobate waveguides
• Nanophotonic supercontinuum based mid-infrared dual-comb spectroscopy
• Ultra-broadband mid-infrared generation in dispersion-engineered thin-film lithium niobate
• Ultra-efficient and highly-tunable second-harmonic generation in Z-cut periodically poled lithium niobate nanowaveguides
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• Wavelength-accurate and wafer-scale process for nonlinear frequency mixers in thin-film lithium niobate
• Ultrabroadband tunable difference frequency generation in standardized thin-film lithium niobate platform
• Spectral and temporal properties of type-II parametric down-conversion: The impact of losses during state generation