Xu Yuntao, Shen Mohan, Lu Juanjuan, Surya Joshua B, Sayem Ayed Al, Tang Hong X
Opt Express. 2021 Feb 15;29(4):5497-5504. doi: 10.1364/OE.418877.
Thin-film lithium niobate is an attractive integrated photonics platform due to its low optical loss and favorable optical nonlinear and electro-optic properties. However, in applications such as second harmonic generation, frequency comb generation, and microwave-to-optics conversion, the device performance is strongly impeded by the photorefractive effect inherent in thin-film lithium niobate. In this paper, we show that the dielectric cladding on a lithium niobate microring resonator has a significant influence on the photorefractive effect. By removing the dielectric cladding layer, the photorefractive effect in lithium niobate ring resonators can be effectively mitigated. Our work presents a reliable approach to control the photorefractive effect on thin-film lithium niobate and will further advance the performance of integrated classical and quantum photonic devices based on thin-film lithium niobate.
由于其低光学损耗以及良好的光学非线性和电光特性，薄膜铌酸锂是一种具有吸引力的集成光子学平台。然而，在诸如二次谐波产生、频率梳产生和微波到光学转换等应用中，薄膜铌酸锂固有的光折变效应严重阻碍了器件性能。在本文中，我们表明铌酸锂微环谐振器上的介质包层对光折变效应有显著影响。通过去除介质包层，可以有效减轻铌酸锂环形谐振器中的光折变效应。我们的工作提出了一种可靠的方法来控制薄膜铌酸锂上的光折变效应，并将进一步提升基于薄膜铌酸锂的集成经典和量子光子器件的性能。
