{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:ZBMUVCN6HB6JKFO32KC2EOZS2B","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":"c147dcffaab57b9581d2ed494d083f1e9475cae6c3ea7a9581a302dcc332a7f7","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2016-01-11T09:49:39Z","title_canon_sha256":"f11b33942ff016cfefebaa95a9d51edbc7e47f9feacf7cfe9a58388fd95ddc34"},"schema_version":"1.0","source":{"id":"1601.02374","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1601.02374","created_at":"2026-05-18T01:16:43Z"},{"alias_kind":"arxiv_version","alias_value":"1601.02374v1","created_at":"2026-05-18T01:16:43Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1601.02374","created_at":"2026-05-18T01:16:43Z"},{"alias_kind":"pith_short_12","alias_value":"ZBMUVCN6HB6J","created_at":"2026-05-18T12:30:53Z"},{"alias_kind":"pith_short_16","alias_value":"ZBMUVCN6HB6JKFO3","created_at":"2026-05-18T12:30:53Z"},{"alias_kind":"pith_short_8","alias_value":"ZBMUVCN6","created_at":"2026-05-18T12:30:53Z"}],"graph_snapshots":[{"event_id":"sha256:89554a541c83b91ea2712d6357f52c9d635f87c3727f5cd1567b34affab9b720","target":"graph","created_at":"2026-05-18T01:16:43Z","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 report on efficient nonlinear generation of ultrafast, higher order \"perfect\" vortices at the green wavelength. Based on Fourier transformation of the higher order Bessel-Gauss beam generated through the combination of spiral phase plate and axicon we have transformed the Gaussian beam of the ultrafast Yb-fiber laser at 1060 nm into perfect vortices of power 4.4 W and order up to 6. Using single-pass second harmonic generation (SHG) of such vortices in 5-mm long chirped MgO-doped, periodically poled congruent LiNbO$_3$ crystal we have generated perfect vortices at green wavelength with outp","authors_text":"G. K. Samanta, M. V. Jabir, N. Apurv Chaitanya","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2016-01-11T09:49:39Z","title":"Efficient nonlinear generation of high power, higher order, ultrafast \"perfect\" vortices in green"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1601.02374","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:bbfe154d5d1ec4cd09d5f2329e62997ab3856d0656534dfc4e6b2d5ed4384177","target":"record","created_at":"2026-05-18T01:16:43Z","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":"c147dcffaab57b9581d2ed494d083f1e9475cae6c3ea7a9581a302dcc332a7f7","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2016-01-11T09:49:39Z","title_canon_sha256":"f11b33942ff016cfefebaa95a9d51edbc7e47f9feacf7cfe9a58388fd95ddc34"},"schema_version":"1.0","source":{"id":"1601.02374","kind":"arxiv","version":1}},"canonical_sha256":"c8594a89be387c9515dbd285a23b32d07ea5c0263b1ede3005e2c6b13d8a1e2d","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"c8594a89be387c9515dbd285a23b32d07ea5c0263b1ede3005e2c6b13d8a1e2d","first_computed_at":"2026-05-18T01:16:43.607886Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:16:43.607886Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"FEg/xZRYM0Y02BAIAt5AkhyXN8WumKYnhraZBU+AvpeRbHL0TqPD5fxqCaV2TUUCt3ZdZl8RqPPoXEUK6I+GCw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:16:43.608470Z","signed_message":"canonical_sha256_bytes"},"source_id":"1601.02374","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:bbfe154d5d1ec4cd09d5f2329e62997ab3856d0656534dfc4e6b2d5ed4384177","sha256:89554a541c83b91ea2712d6357f52c9d635f87c3727f5cd1567b34affab9b720"],"state_sha256":"5619993d57aaee49f34175ff2a002b83fccf21d05fcb213c32f4658b3ec13e38"}