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Mid-infrared nonlinear optics in thin-film lithium niobate on sapphire
Optica ( IF 10.4 ) Pub Date : 2021-06-16 , DOI: 10.1364/optica.427428
Jatadhari Mishra , Timothy P. McKenna , Edwin Ng , Hubert S. Stokowski , Marc Jankowski , Carsten Langrock , David Heydari , Hideo Mabuchi , M. M. Fejer , Amir H. Safavi-Naeini

Periodically poled thin-film lithium niobate (TFLN) waveguides 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 µm. In this work, we demonstrate efficient frequency conversion in a TFLN-on-sapphire platform, which features high transparency up to 4.5 µm. In particular, we report generating mid-infrared light up to 3.66 µm via difference-frequency generation of a fixed 1 µm source and a tunable telecom source, with normalized efficiencies up to $200\% /{\rm{W}} \,{\rm{cm}}^2$. These results show TFLN-on-sapphire to be a promising platform for integrated nonlinear nanophotonics in the mid-infrared.

中文翻译:

蓝宝石上铌酸锂薄膜的中红外非线性光学

周期性极化的薄膜铌酸锂 (TFLN) 波导已成为近红外高效频率转换的领先平台。然而,常用的二氧化硅底部包层在波长超过 2.5 µm 时会导致高吸收损耗。在这项工作中,我们在 TFLN-on-sapphire 平台中展示了高效的频率转换,该平台具有高达 4.5 µm 的高透明度。特别是,我们报告了通过固定 1 µm 光源和可调谐电信光源的差频产生产生高达 3.66 µm 的中红外光,归一化效率高达$200\% /{\rm{W}} \,{ \rm{cm}}^2$。这些结果表明 TFLN-on-sapphire 是中红外集成非线性纳米光子学的有前途的平台。
更新日期:2021-06-18
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