{"paper":{"title":"Low-loss, fabrication-tolerant, and highly-tunable Sagnac loop reflectors and Fabry-P\\'erot cavities on thin-film lithium niobate","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["physics.app-ph"],"primary_cat":"physics.optics","authors_text":"Alexander Hwang, Ali Khalatpour, Amir H. Safavi-Naeini, Darwin Serkland, Devin Dean, Hubert Stokowski, Jason Herrmann, Luke Qi, Martin Fejer, Sam Robison, Taewon Park","submitted_at":"2025-05-29T13:00:41Z","abstract_excerpt":"We present low-loss ($<1.5\\%$) and power-efficient Mach-Zehnder interferometers (MZIs) on thin-film lithium niobate. To accurately measure low MZI losses, we develop a self-calibrated method using tunable Sagnac loop reflectors (SLRs) to build cavities. Fabry-P\\'erot cavities constructed from these fabrication-tolerant SLRs achieve an intrinsic quality factor of $2 \\times 10^6$. By implementing thermal isolation trenches, we also demonstrate a $>10\\times$ reduction in power consumption for thermo-optic phase shifters, achieving a $\\pi$-phase shift ($P_\\pi$) with just 2.5 mW. These tunable and "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2505.23411","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2505.23411/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}