Photorefraction-induced Bragg scattering in cryogenic lithium niobate ring resonators
- 15 January 2021
- journal article
- research article
- Published by Optica Publishing Group in Optics Letters
- Vol. 46 (2), 432-435
- https://doi.org/10.1364/ol.414702
Abstract
We report intracavity Bragg scattering induced by the photorefractive (PR) effect in high-$Q$ lithium niobate ring resonators at cryogenic temperatures. We show that when a cavity mode is strongly excited, the PR effect imprints a long-lived periodic space-charge field. This residual field in turn creates a refractive index modulation pattern that dramatically enhances the back scattering of an incoming probe light, and results in selective and reconfigurable mode splittings. This PR-induced Bragg scattering effect, despite being undesired for many applications, could be utilized to enable optically programmable photonic components.Funding Information
- U.S. Department of Energy (DE-SC0019406)
- David and Lucile Packard Foundation
- National Science Foundation (EFMA-1640959)
- Army Research Office (911NF-18-1-0020, W911NF-19-2-0115)
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