Mid-infrared nonlinear optics in thin-film lithium niobate on sapphire
Mid-infrared nonlinear optics in thin-film lithium niobate on sapphire
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DOI：
10.1364/optica.427428
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发表时间：
2021-06-20
期刊：
影响因子：
10.4
通讯作者：
Safavi-Naeini, Amir H.
中科院分区：
文献类型：
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作者：
Mishra, Jatadhari;McKenna, Timothy P.;Safavi-Naeini, Amir H.
周期性极化薄膜锂酸盐（TFLN）波导已成为近红外高效频率转换的领先平台。然而，通常使用的二氧化硅底部包层导致在超过2.5 μ m的波长处的高吸收损耗。在这项工作中，我们展示了在蓝宝石平台上的TFLN的高效频率转换，其具有高达4.5 μ m的高透明度。特别是，我们报告产生中红外光高达3.66 μ m，通过固定的1 μ m源和可调电信源的差频产生，归一化效率高达200%/W cm（2）。这些结果表明，蓝宝石上的TFLN是一个很有前途的平台，在中红外集成非线性纳米光子学。(C)根据OSA开放获取出版协议的条款，2021年美国光学学会
Periodically poled thin-film lithium niobate (TFLN) wave-guides have emerged as a leading platform for highly efficient frequency conversion in the near-infrared. However, the commonly used silica bottom-cladding results in high absorption loss at wavelengths beyond 2.5 mu m. In this work, we demonstrate efficient frequency conversion in a TFLN-on-sapphire platform, which features high transparency up to 4.5 mu m. In particular, we report generating mid-infrared light up to 3.66 mu m via difference-frequency generation of a fixed 1 mu m source and a tunable telecom source, with normalized efficiencies up to 200%/W cm(2). These results show TFLN-on-sapphire to be a promising platform for integrated nonlinear nanophotonics in the mid-infrared. (C) 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement