Photorefraction-induced Bragg scattering in cryogenic lithium niobate ring resonators

Yuntao Xu, Ayed Al Sayem, Chang Ling Zou, Linran Fan, Risheng Cheng, Hong X. Tang

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


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.

Original languageEnglish (US)
Pages (from-to)432-435
Number of pages4
JournalOptics letters
Issue number2
StatePublished - Jan 15 2021

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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