{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:CB5VWCS6SLLYJAXDIHMQVIA2GR","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"32c582092311ffc502023bc6996f6cf4770e7835a59ef059ac90bc8bf6ae1a45","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.optics","submitted_at":"2021-04-27T22:55:11Z","title_canon_sha256":"46655a831250c5dac2447760c61a4eb74e0f6fea37af393eae4a4b0ca056fcef"},"schema_version":"1.0","source":{"id":"2104.13501","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2104.13501","created_at":"2026-07-05T02:55:46Z"},{"alias_kind":"arxiv_version","alias_value":"2104.13501v2","created_at":"2026-07-05T02:55:46Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2104.13501","created_at":"2026-07-05T02:55:46Z"},{"alias_kind":"pith_short_12","alias_value":"CB5VWCS6SLLY","created_at":"2026-07-05T02:55:46Z"},{"alias_kind":"pith_short_16","alias_value":"CB5VWCS6SLLYJAXD","created_at":"2026-07-05T02:55:46Z"},{"alias_kind":"pith_short_8","alias_value":"CB5VWCS6","created_at":"2026-07-05T02:55:46Z"}],"graph_snapshots":[{"event_id":"sha256:25c2b84942df9ae9645f12ab823803cd1cc856d435cf85852292a98cc14f5445","target":"graph","created_at":"2026-07-05T02:55:46Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2104.13501/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We report an on-chip single mode microlaser with low-threshold fabricated on Erbium doped lithium niobate on insulator (LNOI). The single mode laser emission at 1550.5 nm wavelength is generated in a coupled photonic molecule, which is facilitated by Vernier effect when pumping the photonic molecule at 970 nm. A threshold pump power as low as 200 uW is demonstrated thanks to the high quality factor above 10^6. Moreover, the linewidth of the microlaser reaches 4 kHz, which is the best result in LNOI microlasers. Such single mode micro-laser lithographically fabricated on chip is highly in deman","authors_text":"Jianglin Guan, Jintian Lin, Li Deng, Lingling Qiao, Min Wang, Ni Yao, Renhong Gao, Ya Cheng, Youting Liang, Yuan Zhou, Zhenhua Wang","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.optics","submitted_at":"2021-04-27T22:55:11Z","title":"On-chip ultra-narrow-linewidth single-mode microlaser on lithium niobate on insulator"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2104.13501","kind":"arxiv","version":2},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:dff9d7c2da4c1aeb45960a47c9b2f9150cf7e6a4eb051cfa660cd1c6fd2e0140","target":"record","created_at":"2026-07-05T02:55:46Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"32c582092311ffc502023bc6996f6cf4770e7835a59ef059ac90bc8bf6ae1a45","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.optics","submitted_at":"2021-04-27T22:55:11Z","title_canon_sha256":"46655a831250c5dac2447760c61a4eb74e0f6fea37af393eae4a4b0ca056fcef"},"schema_version":"1.0","source":{"id":"2104.13501","kind":"arxiv","version":2}},"canonical_sha256":"107b5b0a5e92d78482e341d90aa01a347f2cad7ad4c4169e14bad2ea8df4cad5","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"107b5b0a5e92d78482e341d90aa01a347f2cad7ad4c4169e14bad2ea8df4cad5","first_computed_at":"2026-07-05T02:55:46.624246Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T02:55:46.624246Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"MUjI2VMoc3HB9cSi3JDrCF2/EzQs9mvQ6hBkAkdGG6iPVMTJkLNWUiDTDRVOdPNY/BZfQA0Oas6961naY99rCg==","signature_status":"signed_v1","signed_at":"2026-07-05T02:55:46.624668Z","signed_message":"canonical_sha256_bytes"},"source_id":"2104.13501","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:dff9d7c2da4c1aeb45960a47c9b2f9150cf7e6a4eb051cfa660cd1c6fd2e0140","sha256:25c2b84942df9ae9645f12ab823803cd1cc856d435cf85852292a98cc14f5445"],"state_sha256":"1a97bba4a3618054f726b4d159a400ae07607fcc7beae11d6a37a51a7b3ab64c"}