Bannerman, Rex, Field, James, Ahmed, Salman, Gow, Paul C., Churchill, Glenn, Gates, James and Smith, Peter G R (2024) Direct UV written Bragg gratings in lithium niobate ridge waveguides for analysis of process uniformity. Photonics West 2024: Advanced Fabrication Technologies for Micro/Nano Optics and Photonics XVII, Moscone Center, San Francisco, United States. 27 Jan - 01 Feb 2024.
Abstract
We present our research on utilizing weak Bragg grating reflectors to assess the uniformity of zinc-doped lithium niobate ridge waveguides, aiming to optimize frequency conversion. These gratings are fabricated through ablation using a pulsed 213nm laser within a phase-controlled interferometric system, providing sub-nanometer period accuracy. By employing gratings we spectrally and spatially characterize the modal properties of our waveguides, enabling direct analysis of process variability. Through this analysis, we aim to gain a deeper understanding of the effective index variation in periodically poled lithium niobate (PPLN) waveguides, with the ultimate goal of reducing it and improving frequency conversion.
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