{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2019:ORRDMCWPV76ZHANVMVT4WMXZIE","short_pith_number":"pith:ORRDMCWP","schema_version":"1.0","canonical_sha256":"7462360acfaffd9381b56567cb32f9413d21ee785b5aef00fef307c60830585b","source":{"kind":"arxiv","id":"1904.13124","version":1},"attestation_state":"computed","paper":{"title":"QCL-based frequency metrology from the mid-infrared to the THz range: a review","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"physics.optics","authors_text":"Francesco Cappelli, Luigi Consolino, Mario Siciliani de Cumis, Paolo De Natale","submitted_at":"2019-04-30T09:44:35Z","abstract_excerpt":"Quantum cascade lasers (QCLs) are becoming a key tool for plenty of applications, from the mid-infrared (mid-IR) to the THz range. Progress in related areas, such as the development of ultra-low-loss crystalline microresonators, optical frequency standards, and optical fiber networks for time and frequency dissemination, is paving the way for unprecedented applications in many fields. For most demanding applications, a thorough control of QCLs emission must be achieved. In the last few years, QCLs unique spectral features have been unveiled, while multifrequency QCLs have been demonstrated. Ul"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1904.13124","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.optics","submitted_at":"2019-04-30T09:44:35Z","cross_cats_sorted":[],"title_canon_sha256":"ef0e2ce7ee9605d18a0e7622b7bdc015822bd8d3755982e95a7af1121c491337","abstract_canon_sha256":"6d42171b6e1e6d2e322476d947589e1344af97b18aee95c289747ba573646526"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:47:22.099453Z","signature_b64":"MqQ07HOzVrkw1JAEd7mxbEiuoTIg/OUd0l72WCmf6bAz0KxT3ySGoF0p/DcEgTASCD77o6hSxUg0fueRdDRNAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"7462360acfaffd9381b56567cb32f9413d21ee785b5aef00fef307c60830585b","last_reissued_at":"2026-05-17T23:47:22.099043Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:47:22.099043Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"QCL-based frequency metrology from the mid-infrared to the THz range: a review","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"physics.optics","authors_text":"Francesco Cappelli, Luigi Consolino, Mario Siciliani de Cumis, Paolo De Natale","submitted_at":"2019-04-30T09:44:35Z","abstract_excerpt":"Quantum cascade lasers (QCLs) are becoming a key tool for plenty of applications, from the mid-infrared (mid-IR) to the THz range. Progress in related areas, such as the development of ultra-low-loss crystalline microresonators, optical frequency standards, and optical fiber networks for time and frequency dissemination, is paving the way for unprecedented applications in many fields. For most demanding applications, a thorough control of QCLs emission must be achieved. In the last few years, QCLs unique spectral features have been unveiled, while multifrequency QCLs have been demonstrated. Ul"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1904.13124","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"aliases":[{"alias_kind":"arxiv","alias_value":"1904.13124","created_at":"2026-05-17T23:47:22.099105+00:00"},{"alias_kind":"arxiv_version","alias_value":"1904.13124v1","created_at":"2026-05-17T23:47:22.099105+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1904.13124","created_at":"2026-05-17T23:47:22.099105+00:00"},{"alias_kind":"pith_short_12","alias_value":"ORRDMCWPV76Z","created_at":"2026-05-18T12:33:24.271573+00:00"},{"alias_kind":"pith_short_16","alias_value":"ORRDMCWPV76ZHANV","created_at":"2026-05-18T12:33:24.271573+00:00"},{"alias_kind":"pith_short_8","alias_value":"ORRDMCWP","created_at":"2026-05-18T12:33:24.271573+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/ORRDMCWPV76ZHANVMVT4WMXZIE","json":"https://pith.science/pith/ORRDMCWPV76ZHANVMVT4WMXZIE.json","graph_json":"https://pith.science/api/pith-number/ORRDMCWPV76ZHANVMVT4WMXZIE/graph.json","events_json":"https://pith.science/api/pith-number/ORRDMCWPV76ZHANVMVT4WMXZIE/events.json","paper":"https://pith.science/paper/ORRDMCWP"},"agent_actions":{"view_html":"https://pith.science/pith/ORRDMCWPV76ZHANVMVT4WMXZIE","download_json":"https://pith.science/pith/ORRDMCWPV76ZHANVMVT4WMXZIE.json","view_paper":"https://pith.science/paper/ORRDMCWP","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1904.13124&json=true","fetch_graph":"https://pith.science/api/pith-number/ORRDMCWPV76ZHANVMVT4WMXZIE/graph.json","fetch_events":"https://pith.science/api/pith-number/ORRDMCWPV76ZHANVMVT4WMXZIE/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/ORRDMCWPV76ZHANVMVT4WMXZIE/action/timestamp_anchor","attest_storage":"https://pith.science/pith/ORRDMCWPV76ZHANVMVT4WMXZIE/action/storage_attestation","attest_author":"https://pith.science/pith/ORRDMCWPV76ZHANVMVT4WMXZIE/action/author_attestation","sign_citation":"https://pith.science/pith/ORRDMCWPV76ZHANVMVT4WMXZIE/action/citation_signature","submit_replication":"https://pith.science/pith/ORRDMCWPV76ZHANVMVT4WMXZIE/action/replication_record"}},"created_at":"2026-05-17T23:47:22.099105+00:00","updated_at":"2026-05-17T23:47:22.099105+00:00"}