{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2004:QLFGTW5U4ZACR5YQJMWSQHWPPI","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":"e2fb9c183fe8f77768841cc18e8d71356d033abb60b8e69b31e1efa994c2d254","cross_cats_sorted":[],"license":"","primary_cat":"physics.optics","submitted_at":"2004-03-01T21:51:24Z","title_canon_sha256":"24f47d16478e615240cc141bcf8d0a306a233392909b4faf7bec786e96dcb4a1"},"schema_version":"1.0","source":{"id":"physics/0403021","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"physics/0403021","created_at":"2026-05-18T04:18:43Z"},{"alias_kind":"arxiv_version","alias_value":"physics/0403021v1","created_at":"2026-05-18T04:18:43Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.physics/0403021","created_at":"2026-05-18T04:18:43Z"},{"alias_kind":"pith_short_12","alias_value":"QLFGTW5U4ZAC","created_at":"2026-05-18T12:25:52Z"},{"alias_kind":"pith_short_16","alias_value":"QLFGTW5U4ZACR5YQ","created_at":"2026-05-18T12:25:52Z"},{"alias_kind":"pith_short_8","alias_value":"QLFGTW5U","created_at":"2026-05-18T12:25:52Z"}],"graph_snapshots":[{"event_id":"sha256:75b3f91fa00e91416744a3ca444da395dc156570c963df65fa029dfd181be2d7","target":"graph","created_at":"2026-05-18T04:18:43Z","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"},"paper":{"abstract_excerpt":"We present a study of orbital angular momentum transfer from pump to down-converted beams in a type-II Optical Parametric Oscillator. Cavity and anisotropy effects are investigated and demostrated to play a central role in the transverse mode dynamics. While the idler beam can oscillate in a Laguerre-Gauss mode, the crystal birefringence induces an astigmatic effect in the signal beam that prevents the resonance of such mode.","authors_text":"A.Z. Khoury, J.A.O. Huguenin, M. Martinelli, P. Nussenzveig","cross_cats":[],"headline":"","license":"","primary_cat":"physics.optics","submitted_at":"2004-03-01T21:51:24Z","title":"Orbital angular momentum exchange in an optical parametric oscillator"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"physics/0403021","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:d15cae992ebe8513c53a20be72e24fad18029b9f3f601dbf7b7a03611663d6d3","target":"record","created_at":"2026-05-18T04:18:43Z","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":"e2fb9c183fe8f77768841cc18e8d71356d033abb60b8e69b31e1efa994c2d254","cross_cats_sorted":[],"license":"","primary_cat":"physics.optics","submitted_at":"2004-03-01T21:51:24Z","title_canon_sha256":"24f47d16478e615240cc141bcf8d0a306a233392909b4faf7bec786e96dcb4a1"},"schema_version":"1.0","source":{"id":"physics/0403021","kind":"arxiv","version":1}},"canonical_sha256":"82ca69dbb4e64028f7104b2d281ecf7a01e622c233fa90e55fd1231b4801b388","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"82ca69dbb4e64028f7104b2d281ecf7a01e622c233fa90e55fd1231b4801b388","first_computed_at":"2026-05-18T04:18:43.883882Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T04:18:43.883882Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"nNFiNGHq0ALzg1ocG7afpwKz+iREyDFRxkrXgSvlzIUCUxh4nKgGw8xLpuT0zBp3PPwwaqwVYlwKUlzyGbg5CA==","signature_status":"signed_v1","signed_at":"2026-05-18T04:18:43.884332Z","signed_message":"canonical_sha256_bytes"},"source_id":"physics/0403021","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:d15cae992ebe8513c53a20be72e24fad18029b9f3f601dbf7b7a03611663d6d3","sha256:75b3f91fa00e91416744a3ca444da395dc156570c963df65fa029dfd181be2d7"],"state_sha256":"5714ac97c7075bd1a3db2bee6c6d7928f2e68f4237410c6948c3f87126754889"}