{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:CVTBQF3OMZ5USSTN3FOJQPL5ER","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":"77ac919e27ed27b6c5495d955e88b340a08b02f11ab9d5d892e838b403574d05","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2015-02-13T10:54:37Z","title_canon_sha256":"8d0d2bf730ca40fce1068d321bbf95deeb806e9f5a0c45eddf18790279a2b78b"},"schema_version":"1.0","source":{"id":"1502.03940","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1502.03940","created_at":"2026-05-18T00:34:35Z"},{"alias_kind":"arxiv_version","alias_value":"1502.03940v2","created_at":"2026-05-18T00:34:35Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1502.03940","created_at":"2026-05-18T00:34:35Z"},{"alias_kind":"pith_short_12","alias_value":"CVTBQF3OMZ5U","created_at":"2026-05-18T12:29:17Z"},{"alias_kind":"pith_short_16","alias_value":"CVTBQF3OMZ5USSTN","created_at":"2026-05-18T12:29:17Z"},{"alias_kind":"pith_short_8","alias_value":"CVTBQF3O","created_at":"2026-05-18T12:29:17Z"}],"graph_snapshots":[{"event_id":"sha256:d6a3e68bd6b8c388c5b559053e4eea07c2b005c65c4594f83e87c5e7fe6052a9","target":"graph","created_at":"2026-05-18T00:34:35Z","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":"High power single mode quantum cascade lasers with a narrow far field are important for several applications including surgery or military countermeasure. Existing technologies suffer from drawbacks such as operation temperature and scalability. In this paper we introduce a fabrication approach that potentially solves simultaneously these remaining limitations. We demonstrate and characterize deep etched, buried photonic crystal quantum cascade lasers emitting around a wavelength of 8.5 {\\mu}m. The active region was dry etched before being regrown with semi-insulating Fe:InP. This fabrication ","authors_text":"C. Bonzon, J. Faist, J. M. Wolf, M. Beck, M.J. S\\\"uess, R. Peretti, S.Lourdudoss, V. Liverini, W. Metaferia","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2015-02-13T10:54:37Z","title":"Room Temperature Operation of a Buried Heterostructure Photonic Crystal Quantum Cascade Laser"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1502.03940","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:f33a76fb132ab0c8a3c1d20ee57dd7a13be44e5129e2a35ad9bd3b4718ac5039","target":"record","created_at":"2026-05-18T00:34:35Z","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":"77ac919e27ed27b6c5495d955e88b340a08b02f11ab9d5d892e838b403574d05","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2015-02-13T10:54:37Z","title_canon_sha256":"8d0d2bf730ca40fce1068d321bbf95deeb806e9f5a0c45eddf18790279a2b78b"},"schema_version":"1.0","source":{"id":"1502.03940","kind":"arxiv","version":2}},"canonical_sha256":"156618176e667b494a6dd95c983d7d247cbd041e11216d1e77ce3dc684e72ae8","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"156618176e667b494a6dd95c983d7d247cbd041e11216d1e77ce3dc684e72ae8","first_computed_at":"2026-05-18T00:34:35.576082Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:34:35.576082Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"20udhDvbnCstFSDZrvb1e9dzbUExn+1HhByqS5ikd9G2bbHqUNXdZIq1ynqyisfAQ1Bg48g+s3BXX2s6NEdMBQ==","signature_status":"signed_v1","signed_at":"2026-05-18T00:34:35.576651Z","signed_message":"canonical_sha256_bytes"},"source_id":"1502.03940","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:f33a76fb132ab0c8a3c1d20ee57dd7a13be44e5129e2a35ad9bd3b4718ac5039","sha256:d6a3e68bd6b8c388c5b559053e4eea07c2b005c65c4594f83e87c5e7fe6052a9"],"state_sha256":"f4e66b40e19b924e1a7b149807f52815b0f9b1e9156b8acffaec5d48e17ae34c"}