{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2019:JQG7YCTYUQHY4QCZPTOOZP7PUB","short_pith_number":"pith:JQG7YCTY","schema_version":"1.0","canonical_sha256":"4c0dfc0a78a40f8e40597cdcecbfefa067f900bd5737fd7b0a6186defc0dbf5a","source":{"kind":"arxiv","id":"1902.09447","version":5},"attestation_state":"computed","paper":{"title":"Frequency-Resolved Optical Gating Recovery via Smoothing Gradient","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"eess.SP","authors_text":"Henry Arguello, Samuel Pinilla, Tamir Bendory, Yonina C. Eldar","submitted_at":"2019-02-12T05:33:14Z","abstract_excerpt":"Frequency-resolved optical gating (FROG) is a popular technique for complete characterization of ultrashort laser pulses. The acquired data in FROG, called FROG trace, is the Fourier magnitude of the product of the unknown pulse with a time-shifted version of itself, for several different shifts. To estimate the pulse from the FROG trace, we propose an algorithm that minimizes a smoothed non-convex least-squares objective function. The method consists of two steps. First, we approximate the pulse by an iterative spectral algorithm. Then, the attained initialization is refined based upon a sequ"},"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":"1902.09447","kind":"arxiv","version":5},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2019-02-12T05:33:14Z","cross_cats_sorted":[],"title_canon_sha256":"bf89a4b56dcd7f9ef4ccc7a125912a652d3ad4c33120ee2af464aa82c194d5ae","abstract_canon_sha256":"90e2360df49cfc87e655ac7a57294a54317a8b5a2168d117d762445c36322302"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T00:30:58.161295Z","signature_b64":"cx5xYKIZKUNioYqWKjo8p7AzzwBuD7q2BvhTRcBpoQ/lW7CZszyW1XPk1eAaekQsoswMLxjnRWFXBPg10GpPDg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"4c0dfc0a78a40f8e40597cdcecbfefa067f900bd5737fd7b0a6186defc0dbf5a","last_reissued_at":"2026-07-05T00:30:58.160751Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T00:30:58.160751Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Frequency-Resolved Optical Gating Recovery via Smoothing Gradient","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"eess.SP","authors_text":"Henry Arguello, Samuel Pinilla, Tamir Bendory, Yonina C. Eldar","submitted_at":"2019-02-12T05:33:14Z","abstract_excerpt":"Frequency-resolved optical gating (FROG) is a popular technique for complete characterization of ultrashort laser pulses. The acquired data in FROG, called FROG trace, is the Fourier magnitude of the product of the unknown pulse with a time-shifted version of itself, for several different shifts. To estimate the pulse from the FROG trace, we propose an algorithm that minimizes a smoothed non-convex least-squares objective function. The method consists of two steps. First, we approximate the pulse by an iterative spectral algorithm. Then, the attained initialization is refined based upon a sequ"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1902.09447","kind":"arxiv","version":5},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/1902.09447/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"1902.09447","created_at":"2026-07-05T00:30:58.160821+00:00"},{"alias_kind":"arxiv_version","alias_value":"1902.09447v5","created_at":"2026-07-05T00:30:58.160821+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1902.09447","created_at":"2026-07-05T00:30:58.160821+00:00"},{"alias_kind":"pith_short_12","alias_value":"JQG7YCTYUQHY","created_at":"2026-07-05T00:30:58.160821+00:00"},{"alias_kind":"pith_short_16","alias_value":"JQG7YCTYUQHY4QCZ","created_at":"2026-07-05T00:30:58.160821+00:00"},{"alias_kind":"pith_short_8","alias_value":"JQG7YCTY","created_at":"2026-07-05T00:30:58.160821+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/JQG7YCTYUQHY4QCZPTOOZP7PUB","json":"https://pith.science/pith/JQG7YCTYUQHY4QCZPTOOZP7PUB.json","graph_json":"https://pith.science/api/pith-number/JQG7YCTYUQHY4QCZPTOOZP7PUB/graph.json","events_json":"https://pith.science/api/pith-number/JQG7YCTYUQHY4QCZPTOOZP7PUB/events.json","paper":"https://pith.science/paper/JQG7YCTY"},"agent_actions":{"view_html":"https://pith.science/pith/JQG7YCTYUQHY4QCZPTOOZP7PUB","download_json":"https://pith.science/pith/JQG7YCTYUQHY4QCZPTOOZP7PUB.json","view_paper":"https://pith.science/paper/JQG7YCTY","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1902.09447&json=true","fetch_graph":"https://pith.science/api/pith-number/JQG7YCTYUQHY4QCZPTOOZP7PUB/graph.json","fetch_events":"https://pith.science/api/pith-number/JQG7YCTYUQHY4QCZPTOOZP7PUB/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/JQG7YCTYUQHY4QCZPTOOZP7PUB/action/timestamp_anchor","attest_storage":"https://pith.science/pith/JQG7YCTYUQHY4QCZPTOOZP7PUB/action/storage_attestation","attest_author":"https://pith.science/pith/JQG7YCTYUQHY4QCZPTOOZP7PUB/action/author_attestation","sign_citation":"https://pith.science/pith/JQG7YCTYUQHY4QCZPTOOZP7PUB/action/citation_signature","submit_replication":"https://pith.science/pith/JQG7YCTYUQHY4QCZPTOOZP7PUB/action/replication_record"}},"created_at":"2026-07-05T00:30:58.160821+00:00","updated_at":"2026-07-05T00:30:58.160821+00:00"}