{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:CITYILXZSDHA57LVJHCEG7DQRE","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":"43b16db9a39795f460ad58483716882e387bdae92aa2764a8638129ebdaf4923","cross_cats_sorted":["physics.optics"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.atom-ph","submitted_at":"2021-04-24T11:04:01Z","title_canon_sha256":"153beb9fca87ea0a38dc1ba0402c2c65f51edd4e31e96dfc1cc59c09249d8109"},"schema_version":"1.0","source":{"id":"2104.11924","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2104.11924","created_at":"2026-07-05T03:59:21Z"},{"alias_kind":"arxiv_version","alias_value":"2104.11924v1","created_at":"2026-07-05T03:59:21Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2104.11924","created_at":"2026-07-05T03:59:21Z"},{"alias_kind":"pith_short_12","alias_value":"CITYILXZSDHA","created_at":"2026-07-05T03:59:21Z"},{"alias_kind":"pith_short_16","alias_value":"CITYILXZSDHA57LV","created_at":"2026-07-05T03:59:21Z"},{"alias_kind":"pith_short_8","alias_value":"CITYILXZ","created_at":"2026-07-05T03:59:21Z"}],"graph_snapshots":[{"event_id":"sha256:b42987a4abcbeefdbdab16148dd6bfe11d1dbea1b3bc44b39a851f3e54dec2bd","target":"graph","created_at":"2026-07-05T03:59:21Z","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/2104.11924/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"High-power and narrow-linewidth laser light is a vital tool for atomic physics, being used for example in laser cooling and trapping and precision spectroscopy. Here we produce Watt-level laser radiation at 457.49 nm and 460.86 nm of respective relevance for the cooling transitions of cadmium and strontium atoms. This is achieved via the frequency doubling of a kHz-linewidth vertical-external-cavity surface-emitting laser (VECSEL), which is based on a novel gain chip design enabling lasing at > 2 W in the 915-928 nm region. Following an additional doubling stage, spectroscopy of the $^1S_0\\to{","authors_text":"Jonathan N. Tinsley, Jussi-Pekka Penttinen, Leonardo Salvi, Mircea Guina, Nicola Poli, Sanna Ranta, Satvika Bandarupally, Shamaila Manzoor","cross_cats":["physics.optics"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.atom-ph","submitted_at":"2021-04-24T11:04:01Z","title":"Watt-level blue light for precision spectroscopy, laser cooling and trapping of strontium and cadmium atoms"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2104.11924","kind":"arxiv","version":1},"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":"sha256:919892d3aa1f8ebc45d4bc947a9e4149768c5bd294711cf409505622504b5e5e","target":"record","created_at":"2026-07-05T03:59:21Z","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":"43b16db9a39795f460ad58483716882e387bdae92aa2764a8638129ebdaf4923","cross_cats_sorted":["physics.optics"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.atom-ph","submitted_at":"2021-04-24T11:04:01Z","title_canon_sha256":"153beb9fca87ea0a38dc1ba0402c2c65f51edd4e31e96dfc1cc59c09249d8109"},"schema_version":"1.0","source":{"id":"2104.11924","kind":"arxiv","version":1}},"canonical_sha256":"1227842ef990ce0efd7549c4437c708913d33add386ccb9b4182e68d83632497","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"1227842ef990ce0efd7549c4437c708913d33add386ccb9b4182e68d83632497","first_computed_at":"2026-07-05T03:59:21.959074Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T03:59:21.959074Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"KQqabQxlFIgohSV/rxcmIqRU2iWUYLpy26PYPJSyJZ0GgaidiIuPDIvuj+VqD8AAac41XWluSm6tJZfblfrRCw==","signature_status":"signed_v1","signed_at":"2026-07-05T03:59:21.959547Z","signed_message":"canonical_sha256_bytes"},"source_id":"2104.11924","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:919892d3aa1f8ebc45d4bc947a9e4149768c5bd294711cf409505622504b5e5e","sha256:b42987a4abcbeefdbdab16148dd6bfe11d1dbea1b3bc44b39a851f3e54dec2bd"],"state_sha256":"d080c4c4b931e29357a4b8f7cfa4816ac8ca7d9303d7dd9235d3fe2dea2f9600"}