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arXiv · 2205.08763

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

Jatadhari Mishra·Marc Jankowski·Alexander Y. Hwang·Hubert S. Stokowski·Timothy P. McKenna·Carsten Langrock·Edwin Ng·David Heydari·Hideo Mabuchi·Amir H. Safavi-Naeini·M . M. Fejer
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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.

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Jatadhari Mishra, Marc Jankowski, Alexander Y. Hwang, Hubert S. Stokowski, Timothy P. McKenna, Carsten Langrock, Edwin Ng, David Heydari, Hideo Mabuchi, Amir H. Safavi-Naeini, M . M. Fejer. 2022-06-10. Ultra-broadband mid-infrared generation in dispersion-engineered thin-film lithium niobate. https://doi.org/10.1364/oe.467580

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