Ultra-broadband mid-infrared generation in dispersion-engineered thin-film lithium niobate
Ultra-broadband mid-infrared generation in dispersion-engineered thin-film lithium niobate
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DOI：
10.1364/oe.467580
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发表时间：
2022-08-29
期刊：
影响因子：
3.8
通讯作者：
Fejer, M. M.
中科院分区：
文献类型：
--
作者：
Mishra, Jatadhari;Jankowski, Marc;Fejer, M. M.
薄膜铌酸锂（TFLN）是一种用于紧凑、低功耗非线性光学器件的新兴平台，并已广泛用于近红外频率转换。最近的工作已将这些设备扩展到中红外波长，其中广泛可调的光源可用于化学传感。为此，我们通过利用紧密约束波导中可用的色散工程，展示了蓝宝石上均匀极化 TFLN 中固定 1μm 泵浦和可调谐电信源之间的高效宽带差频生成。与等长度的传统铌酸锂波导相比，我们展示了转换效率同时提高了 1-2 个数量级，并且中红外产生的工作带宽提高了 5 倍。我们还研究了表面吸附水的中红外损失对这些设备性能的影响。 (C) 2022 Optica Publishing Group 根据 Optica 开放获取出版协议的条款
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-mu m 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 similar to 5-fold enhancement of operating bandwidth for mid-infrared generation when compared to equal-length conventional lithium niobate waveguides. We also examine the effects of mid-infrared loss from surface-adsorbed water on the performance of these devices. (C) 2022 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement