{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2017:4EEPNUV5Y22RHHUET2WR7P4UH6","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":"c1e8520d567695f6e371a1a2987a5ec9d04eafe8bcfe2110375d6f8fa8aaef01","cross_cats_sorted":["physics.optics"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2017-02-10T15:01:42Z","title_canon_sha256":"4d8c853c16c3f67e09243eab6d02f16dcc4f44b8f5e72792ea5c06d313d58fd7"},"schema_version":"1.0","source":{"id":"1702.03831","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1702.03831","created_at":"2026-05-18T00:34:51Z"},{"alias_kind":"arxiv_version","alias_value":"1702.03831v1","created_at":"2026-05-18T00:34:51Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1702.03831","created_at":"2026-05-18T00:34:51Z"},{"alias_kind":"pith_short_12","alias_value":"4EEPNUV5Y22R","created_at":"2026-05-18T12:30:58Z"},{"alias_kind":"pith_short_16","alias_value":"4EEPNUV5Y22RHHUE","created_at":"2026-05-18T12:30:58Z"},{"alias_kind":"pith_short_8","alias_value":"4EEPNUV5","created_at":"2026-05-18T12:30:58Z"}],"graph_snapshots":[{"event_id":"sha256:bf8c8a26a546ad283881727c4d05667502e6841cc01592824b05a0c527989eb2","target":"graph","created_at":"2026-05-18T00:34:51Z","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 the first direct measurement of the emission character of quantum cascade laser based frequency combs, using intensity autocorrelation. The correlation technique is based on fast electro-optic sampling, with a bandwidth optimized to match the emission spectra of the comb laser, centered around 2.5~THz. We find the output light to be amplitude and frequency modulated at the same time, with intensity modulation depth as high as 90\\%, occuring on timescales as short as few picoseconds. We compare these findings with intensity autocorrelation measurements of pulsed Terahertz light ori","authors_text":"Giacomo Scalari, Ileana-Cristina Benea-Chelmus, J\\'er\\^ome Faist, Markus R\\\"osch, Mattias Beck","cross_cats":["physics.optics"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2017-02-10T15:01:42Z","title":"Intensity autocorrelation measurements of quantum cascade laser frequency combs in the Terahertz range"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1702.03831","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":"sha256:1b6b25851843dc446928a6c2392bf43b7bf19a6de758323d69110b4aebd50610","target":"record","created_at":"2026-05-18T00:34:51Z","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":"c1e8520d567695f6e371a1a2987a5ec9d04eafe8bcfe2110375d6f8fa8aaef01","cross_cats_sorted":["physics.optics"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2017-02-10T15:01:42Z","title_canon_sha256":"4d8c853c16c3f67e09243eab6d02f16dcc4f44b8f5e72792ea5c06d313d58fd7"},"schema_version":"1.0","source":{"id":"1702.03831","kind":"arxiv","version":1}},"canonical_sha256":"e108f6d2bdc6b5139e849ead1fbf943f89f5b6d7e10a69e76dc0f66e20e8ed2a","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"e108f6d2bdc6b5139e849ead1fbf943f89f5b6d7e10a69e76dc0f66e20e8ed2a","first_computed_at":"2026-05-18T00:34:51.837046Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:34:51.837046Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"MVkE6Pzx0z8ltlUeU8yRRLYcRupWVgiKcaXLsb49w5QkV6F3UvmW6KLIo0wZV3FmZd4cXm0hzJj7wahYDxC2DQ==","signature_status":"signed_v1","signed_at":"2026-05-18T00:34:51.837704Z","signed_message":"canonical_sha256_bytes"},"source_id":"1702.03831","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:1b6b25851843dc446928a6c2392bf43b7bf19a6de758323d69110b4aebd50610","sha256:bf8c8a26a546ad283881727c4d05667502e6841cc01592824b05a0c527989eb2"],"state_sha256":"f4220616fdca847ccc99519bf85b137abd0661fede8f7cc5b1b72afb266141c1"}