{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:IITLQCLMB5ZRHZH6YQQOQAFENV","short_pith_number":"pith:IITLQCLM","canonical_record":{"source":{"id":"1905.05672","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2019-05-14T15:35:13Z","cross_cats_sorted":[],"title_canon_sha256":"7272eb54da43df3b2f674870a2b5781f91fdf1e41e21945fb541faae9c61bb53","abstract_canon_sha256":"ebc477a32214cb4c504edc44778143ffeef26f9be8d6dfc37341a7f9b37e6d8f"},"schema_version":"1.0"},"canonical_sha256":"4226b8096c0f7313e4fec420e800a46d4f2d42a1bbc3cf909d358f13ef3c0446","source":{"kind":"arxiv","id":"1905.05672","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1905.05672","created_at":"2026-05-17T23:42:19Z"},{"alias_kind":"arxiv_version","alias_value":"1905.05672v1","created_at":"2026-05-17T23:42:19Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1905.05672","created_at":"2026-05-17T23:42:19Z"},{"alias_kind":"pith_short_12","alias_value":"IITLQCLMB5ZR","created_at":"2026-05-18T12:33:18Z"},{"alias_kind":"pith_short_16","alias_value":"IITLQCLMB5ZRHZH6","created_at":"2026-05-18T12:33:18Z"},{"alias_kind":"pith_short_8","alias_value":"IITLQCLM","created_at":"2026-05-18T12:33:18Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:IITLQCLMB5ZRHZH6YQQOQAFENV","target":"record","payload":{"canonical_record":{"source":{"id":"1905.05672","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2019-05-14T15:35:13Z","cross_cats_sorted":[],"title_canon_sha256":"7272eb54da43df3b2f674870a2b5781f91fdf1e41e21945fb541faae9c61bb53","abstract_canon_sha256":"ebc477a32214cb4c504edc44778143ffeef26f9be8d6dfc37341a7f9b37e6d8f"},"schema_version":"1.0"},"canonical_sha256":"4226b8096c0f7313e4fec420e800a46d4f2d42a1bbc3cf909d358f13ef3c0446","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:42:19.033248Z","signature_b64":"izl2y1P+HPgZ77sPsvqEydw0xEy4IljtF7dEYjJHaSlFo6uJxUwzBANfGov43YXnVWL+yXYdNNG/Ok8s7z8+DA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"4226b8096c0f7313e4fec420e800a46d4f2d42a1bbc3cf909d358f13ef3c0446","last_reissued_at":"2026-05-17T23:42:19.032808Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:42:19.032808Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1905.05672","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-17T23:42:19Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"NBDK0z+SUWfXG+PuIwG5vL5dA2dH9Ekg6uoGas5BqLeZ6nbJ7EALV00q+IUOzIY7lGlT7DRsX7nluQqUEMq4Dg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T19:30:18.437103Z"},"content_sha256":"1f59b2b15b306c74377c476618235a85882d39e0ddd2e294cffc402bdd468042","schema_version":"1.0","event_id":"sha256:1f59b2b15b306c74377c476618235a85882d39e0ddd2e294cffc402bdd468042"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:IITLQCLMB5ZRHZH6YQQOQAFENV","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Pulses from a mid-infrared quantum cascade laser frequency comb using an external compressor","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.optics","authors_text":"Jerome Faist, Matthew Singleton, Mattias Beck","submitted_at":"2019-05-14T15:35:13Z","abstract_excerpt":"A Martinez-type stretcher-compressor is used to modify the spectral phases of a high-power (~1 W) QCL comb emitted at 8.2 {\\mu}m with more than 100 cm-1 spectral bandwidth. Using this scheme, we demonstrate a compression of the QCL output from a 134 ps continuous wave waveform, to a train of pulses of width 12 ps, and a power with peak to average ratio of 40.7. An evaluation of the phase noise of the free-running device yields an integrated timing jitter of 335 fs over the frequency range 20 kHz - 100 MHz, and a pulse-to-pulse jitter of 2.0 fs."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1905.05672","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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-17T23:42:19Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"yKO/S4Q1ya7BMIADWeGUkZz+vm1b3sW4S7KGNxBdXqB0yS6AKTnEBd1y0LJyA/ZoCiZeNPPqHPIL7nzkhMXrDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T19:30:18.437949Z"},"content_sha256":"a4e982291b201215bd0c232bb25770021a22f40a7966ab56411756292b8b9501","schema_version":"1.0","event_id":"sha256:a4e982291b201215bd0c232bb25770021a22f40a7966ab56411756292b8b9501"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/IITLQCLMB5ZRHZH6YQQOQAFENV/bundle.json","state_url":"https://pith.science/pith/IITLQCLMB5ZRHZH6YQQOQAFENV/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/IITLQCLMB5ZRHZH6YQQOQAFENV/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-05-30T19:30:18Z","links":{"resolver":"https://pith.science/pith/IITLQCLMB5ZRHZH6YQQOQAFENV","bundle":"https://pith.science/pith/IITLQCLMB5ZRHZH6YQQOQAFENV/bundle.json","state":"https://pith.science/pith/IITLQCLMB5ZRHZH6YQQOQAFENV/state.json","well_known_bundle":"https://pith.science/.well-known/pith/IITLQCLMB5ZRHZH6YQQOQAFENV/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:IITLQCLMB5ZRHZH6YQQOQAFENV","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":"ebc477a32214cb4c504edc44778143ffeef26f9be8d6dfc37341a7f9b37e6d8f","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2019-05-14T15:35:13Z","title_canon_sha256":"7272eb54da43df3b2f674870a2b5781f91fdf1e41e21945fb541faae9c61bb53"},"schema_version":"1.0","source":{"id":"1905.05672","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1905.05672","created_at":"2026-05-17T23:42:19Z"},{"alias_kind":"arxiv_version","alias_value":"1905.05672v1","created_at":"2026-05-17T23:42:19Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1905.05672","created_at":"2026-05-17T23:42:19Z"},{"alias_kind":"pith_short_12","alias_value":"IITLQCLMB5ZR","created_at":"2026-05-18T12:33:18Z"},{"alias_kind":"pith_short_16","alias_value":"IITLQCLMB5ZRHZH6","created_at":"2026-05-18T12:33:18Z"},{"alias_kind":"pith_short_8","alias_value":"IITLQCLM","created_at":"2026-05-18T12:33:18Z"}],"graph_snapshots":[{"event_id":"sha256:a4e982291b201215bd0c232bb25770021a22f40a7966ab56411756292b8b9501","target":"graph","created_at":"2026-05-17T23:42:19Z","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":"A Martinez-type stretcher-compressor is used to modify the spectral phases of a high-power (~1 W) QCL comb emitted at 8.2 {\\mu}m with more than 100 cm-1 spectral bandwidth. Using this scheme, we demonstrate a compression of the QCL output from a 134 ps continuous wave waveform, to a train of pulses of width 12 ps, and a power with peak to average ratio of 40.7. An evaluation of the phase noise of the free-running device yields an integrated timing jitter of 335 fs over the frequency range 20 kHz - 100 MHz, and a pulse-to-pulse jitter of 2.0 fs.","authors_text":"Jerome Faist, Matthew Singleton, Mattias Beck","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2019-05-14T15:35:13Z","title":"Pulses from a mid-infrared quantum cascade laser frequency comb using an external compressor"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1905.05672","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":"sha256:1f59b2b15b306c74377c476618235a85882d39e0ddd2e294cffc402bdd468042","target":"record","created_at":"2026-05-17T23:42:19Z","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":"ebc477a32214cb4c504edc44778143ffeef26f9be8d6dfc37341a7f9b37e6d8f","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2019-05-14T15:35:13Z","title_canon_sha256":"7272eb54da43df3b2f674870a2b5781f91fdf1e41e21945fb541faae9c61bb53"},"schema_version":"1.0","source":{"id":"1905.05672","kind":"arxiv","version":1}},"canonical_sha256":"4226b8096c0f7313e4fec420e800a46d4f2d42a1bbc3cf909d358f13ef3c0446","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"4226b8096c0f7313e4fec420e800a46d4f2d42a1bbc3cf909d358f13ef3c0446","first_computed_at":"2026-05-17T23:42:19.032808Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:42:19.032808Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"izl2y1P+HPgZ77sPsvqEydw0xEy4IljtF7dEYjJHaSlFo6uJxUwzBANfGov43YXnVWL+yXYdNNG/Ok8s7z8+DA==","signature_status":"signed_v1","signed_at":"2026-05-17T23:42:19.033248Z","signed_message":"canonical_sha256_bytes"},"source_id":"1905.05672","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:1f59b2b15b306c74377c476618235a85882d39e0ddd2e294cffc402bdd468042","sha256:a4e982291b201215bd0c232bb25770021a22f40a7966ab56411756292b8b9501"],"state_sha256":"b495e9668c5eded4accabbbcbe780b6b7db8ffb0adc214912ea173d1847f9de8"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"qKuRLZgQO5yVMCzhARxre3PubeUeZYn+7Xq3bZG//WY3S6qWjTcmmIwT/TprS2jPKqG4uEmT2oNAk85PnP+EDA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-30T19:30:18.442298Z","bundle_sha256":"f95a6e168f5c30e27681aeb88b5541f944e10fa2d889c86857cf159b69964fed"}}