{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:EWJACCBC73A3SLBCEFHFC3N4DQ","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":"f89d051d93c8f48e1012dd97747cd30ffa3e996edf0ff1095c6046466e7a7dd8","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2021-10-10T17:18:02Z","title_canon_sha256":"c6b6c6acbcf58d67147bf7ee3e15b5ee6e1d406b90aba995cc9cd995f0cafdf2"},"schema_version":"1.0","source":{"id":"2110.04856","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2110.04856","created_at":"2026-07-05T03:22:37Z"},{"alias_kind":"arxiv_version","alias_value":"2110.04856v1","created_at":"2026-07-05T03:22:37Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2110.04856","created_at":"2026-07-05T03:22:37Z"},{"alias_kind":"pith_short_12","alias_value":"EWJACCBC73A3","created_at":"2026-07-05T03:22:37Z"},{"alias_kind":"pith_short_16","alias_value":"EWJACCBC73A3SLBC","created_at":"2026-07-05T03:22:37Z"},{"alias_kind":"pith_short_8","alias_value":"EWJACCBC","created_at":"2026-07-05T03:22:37Z"}],"graph_snapshots":[{"event_id":"sha256:5498473641b1582bb85c37a5ed1aa21d068b3dc5ff564f7dd569d26f780f6caa","target":"graph","created_at":"2026-07-05T03:22:37Z","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/2110.04856/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"In the second part of our series on integrated photonic spectrographs for astronomy, we present theoretical and experimental results on the design, simulation and characterization of custom-manufactured silica-on-silicon Arrayed Waveguide Gratings (AWGs) constructed using the three-stigmatic-point method. We derive several mid-to-high resolution field-flattened AWG designs, targeting resolving powers of 11,000 - 35,000 in the astronomical H-band, by iterative computation of differential coefficients of the optical path function. We use numerical simulations to study the imaging properties of t","authors_text":"Andreas Stoll, Kalaga Madhav, Martin Roth","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2021-10-10T17:18:02Z","title":"Design, simulation and characterization of integrated photonic spectrographs for Astronomy II: Low-aberration Generation-II AWG devices with three stigmatic points"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2110.04856","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:c257f64fdc34ed11f855859126d71aea62262b775f4a8966a733ed31e3db5c78","target":"record","created_at":"2026-07-05T03:22:37Z","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":"f89d051d93c8f48e1012dd97747cd30ffa3e996edf0ff1095c6046466e7a7dd8","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2021-10-10T17:18:02Z","title_canon_sha256":"c6b6c6acbcf58d67147bf7ee3e15b5ee6e1d406b90aba995cc9cd995f0cafdf2"},"schema_version":"1.0","source":{"id":"2110.04856","kind":"arxiv","version":1}},"canonical_sha256":"2592010822fec1b92c22214e516dbc1c3c591079d17ded5d5419d14da1cc15be","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"2592010822fec1b92c22214e516dbc1c3c591079d17ded5d5419d14da1cc15be","first_computed_at":"2026-07-05T03:22:37.338951Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T03:22:37.338951Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Lbnn4pAjofdkVepP/qEL4Js+ts+dbKJ6JPc/q21tEDUA0c2tY0Wz3I6qGRptQe/4vX4ordVn6g7IiYfBYt5EBQ==","signature_status":"signed_v1","signed_at":"2026-07-05T03:22:37.339453Z","signed_message":"canonical_sha256_bytes"},"source_id":"2110.04856","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:c257f64fdc34ed11f855859126d71aea62262b775f4a8966a733ed31e3db5c78","sha256:5498473641b1582bb85c37a5ed1aa21d068b3dc5ff564f7dd569d26f780f6caa"],"state_sha256":"fa9f79d30b55381af519e12b0927560296c90dc58d4654ccf6c623c1ea3531ab"}