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13 March 2024 Direct UV written Bragg gratings in lithium niobate ridge waveguides for analysis of process uniformity
Rex H. S. Bannerman, James W. Field, Q. Salman Ahmed, Paul C. Gow, James C. Gates, Peter G. R. Smith, Corin B. E. Gawith
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Proceedings Volume PC12869, Nonlinear Frequency Generation and Conversion: Materials and Devices XXIII; PC128690B (2024) https://doi.org/10.1117/12.3001044
Event: SPIE LASE, 2024, San Francisco, California, United States
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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(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.
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Rex H. S. Bannerman, James W. Field, Q. Salman Ahmed, Paul C. Gow, James C. Gates, Peter G. R. Smith, and Corin B. E. Gawith "Direct UV written Bragg gratings in lithium niobate ridge waveguides for analysis of process uniformity", Proc. SPIE PC12869, Nonlinear Frequency Generation and Conversion: Materials and Devices XXIII, PC128690B (13 March 2024); https://doi.org/10.1117/12.3001044
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KEYWORDS
Waveguides
Bragg gratings
Lithium niobate
Ultraviolet radiation
Analytical research
Optical gratings
Refractive index
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