Abstract

It is shown that laser modification of a nanometer titanium film can be used for precise control of the loss level in optical waveguides on lithium niobate substrates. Theoretical estimates of the change in linear losses at the level of 0.95 dB/mm were confirmed by experiments on local laser modification using radiation at a wavelength of 976 nm with a threshold intensity of 1 kW/mm². The proposed method can be effectively used for precision adjustment of the characteristics of integrated optical devices, such as the modulation contrast of Mach–Zehnder modulators.

中文翻译：

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铌酸锂衬底上光波导中钛膜的激光改性

摘要

结果表明，纳米钛膜的激光改性可用于精确控制铌酸锂基板上光波导中的损耗水平。通过使用波长为976 nm且阈值强度为1 kW / mm ^2的辐射进行局部激光修改的实验，证实了线损变化为0.95 dB / mm时的理论估计。所提出的方法可以有效地用于集成光学设备特性的精确调整，例如Mach–Zehnder调制器的调制对比度。