{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:HJ2RI44AX4WVXBESRK4GVTSWP7","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":"548659321080c22664e7ed7e0bdebcc31dad91efe311aff2a812a69bc44f1c1a","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.optics","submitted_at":"2021-05-11T08:49:15Z","title_canon_sha256":"d4fdeb6d8009e15e896835be05f68a9e0592813851559b95b357689a204176cc"},"schema_version":"1.0","source":{"id":"2105.04870","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2105.04870","created_at":"2026-07-05T03:34:06Z"},{"alias_kind":"arxiv_version","alias_value":"2105.04870v2","created_at":"2026-07-05T03:34:06Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2105.04870","created_at":"2026-07-05T03:34:06Z"},{"alias_kind":"pith_short_12","alias_value":"HJ2RI44AX4WV","created_at":"2026-07-05T03:34:06Z"},{"alias_kind":"pith_short_16","alias_value":"HJ2RI44AX4WVXBES","created_at":"2026-07-05T03:34:06Z"},{"alias_kind":"pith_short_8","alias_value":"HJ2RI44A","created_at":"2026-07-05T03:34:06Z"}],"graph_snapshots":[{"event_id":"sha256:8664c2c1abe2feb676d293750db9dd6b6e671373321ff6d6ffb894c66d983711","target":"graph","created_at":"2026-07-05T03:34:06Z","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/2105.04870/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"The quantum cascade laser (QCL) has evolved to be a compact, powerful source of coherent mid-infrared (mid-IR) light. However, its fast gain dynamics strongly restricts the formation of ultrashort pulses. As such, the shortest pulses reported so far were limited to a few picoseconds with some hundreds of milliwatts of peak power, strongly narrowing their applicability for time-resolved and nonlinear experiments. Here, we demonstrate an alternative approach capable of producing near-transform-limited sub-picosecond pulses with several watts of peak power. Starting from a frequency modulated pha","authors_text":"Barbara Schneider, Filippos Kapsalidis, J\\'er\\^ome Faist, Mathieu Bertrand, Matthew Singleton, Mattias Beck, Philipp T\\\"aschler, Pierre Jouy","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.optics","submitted_at":"2021-05-11T08:49:15Z","title":"Femtosecond pulses from a mid-infrared quantum cascade laser"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2105.04870","kind":"arxiv","version":2},"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:b8b2a7b81d4219b470c5f231f1b3f3fc7142447eed973dd2bad8c81e88435270","target":"record","created_at":"2026-07-05T03:34:06Z","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":"548659321080c22664e7ed7e0bdebcc31dad91efe311aff2a812a69bc44f1c1a","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.optics","submitted_at":"2021-05-11T08:49:15Z","title_canon_sha256":"d4fdeb6d8009e15e896835be05f68a9e0592813851559b95b357689a204176cc"},"schema_version":"1.0","source":{"id":"2105.04870","kind":"arxiv","version":2}},"canonical_sha256":"3a75147380bf2d5b84928ab86ace567fc898d57e05aeceaeb7ba247cb34a923f","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"3a75147380bf2d5b84928ab86ace567fc898d57e05aeceaeb7ba247cb34a923f","first_computed_at":"2026-07-05T03:34:06.362475Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T03:34:06.362475Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"xE4FnBy3bpXh+cyNweWOA57xRxRK1jHx3x1lyAiqxu6/8dhC/TTXS+OhBtn+0IPDtF4cVq4PPMN8ux3Jm6NuBA==","signature_status":"signed_v1","signed_at":"2026-07-05T03:34:06.362917Z","signed_message":"canonical_sha256_bytes"},"source_id":"2105.04870","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:b8b2a7b81d4219b470c5f231f1b3f3fc7142447eed973dd2bad8c81e88435270","sha256:8664c2c1abe2feb676d293750db9dd6b6e671373321ff6d6ffb894c66d983711"],"state_sha256":"284719a04c5c2bcdb601bd0fcc79bb4d270055e99fe935bdc1a087725c10a839"}