{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2013:O2FQ6YOMEOIVJO6CWQK36JS4KX","short_pith_number":"pith:O2FQ6YOM","canonical_record":{"source":{"id":"1304.7257","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2013-04-26T19:25:30Z","cross_cats_sorted":[],"title_canon_sha256":"c9c18237d4f0e54eb9798331f5dde8a4bc1e19ae7de502929f8e3f8d996eeb77","abstract_canon_sha256":"1c1e50c182abf6913c9f09d8ea4b92bd8d736361cc31f818b10a95cf7579a116"},"schema_version":"1.0"},"canonical_sha256":"768b0f61cc239154bbc2b415bf265c55cd4df31bd9e8bf199785d2ac2a247cb7","source":{"kind":"arxiv","id":"1304.7257","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1304.7257","created_at":"2026-05-18T01:50:21Z"},{"alias_kind":"arxiv_version","alias_value":"1304.7257v2","created_at":"2026-05-18T01:50:21Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1304.7257","created_at":"2026-05-18T01:50:21Z"},{"alias_kind":"pith_short_12","alias_value":"O2FQ6YOMEOIV","created_at":"2026-05-18T12:27:54Z"},{"alias_kind":"pith_short_16","alias_value":"O2FQ6YOMEOIVJO6C","created_at":"2026-05-18T12:27:54Z"},{"alias_kind":"pith_short_8","alias_value":"O2FQ6YOM","created_at":"2026-05-18T12:27:54Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2013:O2FQ6YOMEOIVJO6CWQK36JS4KX","target":"record","payload":{"canonical_record":{"source":{"id":"1304.7257","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2013-04-26T19:25:30Z","cross_cats_sorted":[],"title_canon_sha256":"c9c18237d4f0e54eb9798331f5dde8a4bc1e19ae7de502929f8e3f8d996eeb77","abstract_canon_sha256":"1c1e50c182abf6913c9f09d8ea4b92bd8d736361cc31f818b10a95cf7579a116"},"schema_version":"1.0"},"canonical_sha256":"768b0f61cc239154bbc2b415bf265c55cd4df31bd9e8bf199785d2ac2a247cb7","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:50:21.261733Z","signature_b64":"OU0Fb/jA9+GCbN5hVV4621avf/Q76WMOtlEzBZMxsE0pbQTpe0roJXimI0Z2KVnmeS8VuAm+HzddUCPt17aeDA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"768b0f61cc239154bbc2b415bf265c55cd4df31bd9e8bf199785d2ac2a247cb7","last_reissued_at":"2026-05-18T01:50:21.261106Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:50:21.261106Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1304.7257","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:50:21Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"2lr17CVevms2HUV0F8FlBfYJZdFLCwxgzBBrEfwDOwgxdB8LmGsK7Xrp8TsNT+YMa3SY6ybDcMgiUGL1lnCfCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T13:06:30.674871Z"},"content_sha256":"af9408291d731352bf181eff3498b738099954012285c758454a68403ac96f44","schema_version":"1.0","event_id":"sha256:af9408291d731352bf181eff3498b738099954012285c758454a68403ac96f44"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2013:O2FQ6YOMEOIVJO6CWQK36JS4KX","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Direct Spectro-Temporal Characterization of Femtosecond Extreme-Ultraviolet Pulses","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.optics","authors_text":"Beno\\^it Mahieu, David Gauthier, Giovanni De Ninno","submitted_at":"2013-04-26T19:25:30Z","abstract_excerpt":"We propose a method for a straightforward characterization of the temporal shape of femtosecond pulses in the extreme-ultraviolet/soft X-ray spectral region. The approach is based on the presence of a significant linear frequency chirp in the pulse. This allows to establish an homothetic relation between the pulse spectrum and its temporal profile. The theoretical approach is reminiscent of the one employed by Fraunhofer for describing far-field diffraction. As an application, we consider the case of a seeded free-electron laser (FEL). Theory is successfully benchmarked with numerical simulati"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1304.7257","kind":"arxiv","version":2},"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":"2026-05-18T01:50:21Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"xqbeLw0YZJHRnb1L8WCyx/IEGTDn5j5cLk2g/6+CUicB6n96ZUN6l+EcoYpdMchkCfWgqsqBhLEsmJsbKNq7Bw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T13:06:30.675228Z"},"content_sha256":"49ae9e5ff8a53e44a283d587d0e9af49e4843caadbcf836d58724912af3373bd","schema_version":"1.0","event_id":"sha256:49ae9e5ff8a53e44a283d587d0e9af49e4843caadbcf836d58724912af3373bd"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/O2FQ6YOMEOIVJO6CWQK36JS4KX/bundle.json","state_url":"https://pith.science/pith/O2FQ6YOMEOIVJO6CWQK36JS4KX/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/O2FQ6YOMEOIVJO6CWQK36JS4KX/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":"2026-05-28T13:06:30Z","links":{"resolver":"https://pith.science/pith/O2FQ6YOMEOIVJO6CWQK36JS4KX","bundle":"https://pith.science/pith/O2FQ6YOMEOIVJO6CWQK36JS4KX/bundle.json","state":"https://pith.science/pith/O2FQ6YOMEOIVJO6CWQK36JS4KX/state.json","well_known_bundle":"https://pith.science/.well-known/pith/O2FQ6YOMEOIVJO6CWQK36JS4KX/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:O2FQ6YOMEOIVJO6CWQK36JS4KX","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":"1c1e50c182abf6913c9f09d8ea4b92bd8d736361cc31f818b10a95cf7579a116","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2013-04-26T19:25:30Z","title_canon_sha256":"c9c18237d4f0e54eb9798331f5dde8a4bc1e19ae7de502929f8e3f8d996eeb77"},"schema_version":"1.0","source":{"id":"1304.7257","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1304.7257","created_at":"2026-05-18T01:50:21Z"},{"alias_kind":"arxiv_version","alias_value":"1304.7257v2","created_at":"2026-05-18T01:50:21Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1304.7257","created_at":"2026-05-18T01:50:21Z"},{"alias_kind":"pith_short_12","alias_value":"O2FQ6YOMEOIV","created_at":"2026-05-18T12:27:54Z"},{"alias_kind":"pith_short_16","alias_value":"O2FQ6YOMEOIVJO6C","created_at":"2026-05-18T12:27:54Z"},{"alias_kind":"pith_short_8","alias_value":"O2FQ6YOM","created_at":"2026-05-18T12:27:54Z"}],"graph_snapshots":[{"event_id":"sha256:49ae9e5ff8a53e44a283d587d0e9af49e4843caadbcf836d58724912af3373bd","target":"graph","created_at":"2026-05-18T01:50:21Z","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 propose a method for a straightforward characterization of the temporal shape of femtosecond pulses in the extreme-ultraviolet/soft X-ray spectral region. The approach is based on the presence of a significant linear frequency chirp in the pulse. This allows to establish an homothetic relation between the pulse spectrum and its temporal profile. The theoretical approach is reminiscent of the one employed by Fraunhofer for describing far-field diffraction. As an application, we consider the case of a seeded free-electron laser (FEL). Theory is successfully benchmarked with numerical simulati","authors_text":"Beno\\^it Mahieu, David Gauthier, Giovanni De Ninno","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2013-04-26T19:25:30Z","title":"Direct Spectro-Temporal Characterization of Femtosecond Extreme-Ultraviolet Pulses"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1304.7257","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:af9408291d731352bf181eff3498b738099954012285c758454a68403ac96f44","target":"record","created_at":"2026-05-18T01:50:21Z","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":"1c1e50c182abf6913c9f09d8ea4b92bd8d736361cc31f818b10a95cf7579a116","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2013-04-26T19:25:30Z","title_canon_sha256":"c9c18237d4f0e54eb9798331f5dde8a4bc1e19ae7de502929f8e3f8d996eeb77"},"schema_version":"1.0","source":{"id":"1304.7257","kind":"arxiv","version":2}},"canonical_sha256":"768b0f61cc239154bbc2b415bf265c55cd4df31bd9e8bf199785d2ac2a247cb7","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"768b0f61cc239154bbc2b415bf265c55cd4df31bd9e8bf199785d2ac2a247cb7","first_computed_at":"2026-05-18T01:50:21.261106Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:50:21.261106Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"OU0Fb/jA9+GCbN5hVV4621avf/Q76WMOtlEzBZMxsE0pbQTpe0roJXimI0Z2KVnmeS8VuAm+HzddUCPt17aeDA==","signature_status":"signed_v1","signed_at":"2026-05-18T01:50:21.261733Z","signed_message":"canonical_sha256_bytes"},"source_id":"1304.7257","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:af9408291d731352bf181eff3498b738099954012285c758454a68403ac96f44","sha256:49ae9e5ff8a53e44a283d587d0e9af49e4843caadbcf836d58724912af3373bd"],"state_sha256":"254398183d08fcd6caa5a72749822eae1b7707801fdb620feeca911c65f2ae04"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"BPj6yP8x9++g4JZCSwEvz6UgS8WEaOCMTkrUvsUkghAEJdLvhjmv50Ae9O+67GCC8osKLR9zxh21RapYUKGuAw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-28T13:06:30.677175Z","bundle_sha256":"317a4909c5f9dc72a2590530438c73406dad1269da9097e0d7d68281fee69fdd"}}