{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2026:SIWVHVRJOHSPUMRRNCKBGY7QPU","short_pith_number":"pith:SIWVHVRJ","schema_version":"1.0","canonical_sha256":"922d53d62971e4fa323168941363f07d04f5c936484a90a9e68971d9e9617716","source":{"kind":"arxiv","id":"2608.13288","version":1},"attestation_state":"computed","paper":{"title":"Geometric Parametric Instability in Nonlinear Multipass Cells","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.optics","authors_text":"Chao Mei, G\\\"unter Steinmeyer, Jinhui Yuan, Jintao Fan, Junhong Yang, Peilong Yang, Qian Gao, Tao Sun","submitted_at":"2026-08-13T14:23:55Z","abstract_excerpt":"Geometric parametric instability (GPI) is the resonant growth of discrete spectral sidebands enabled by longitudinally periodic multimode evolution and has been studied primarily in graded-index fibers. Here we show theoretically and numerically that GPI can occur in gas-filled nonlinear multipass cells (MPCs). By mapping a mode-matched MPC onto an equivalent waveguide, we derive a Floquet quasi-phase-matching condition governed by the single-pass Gouy-phase imbalance of the signal--idler pair relative to the pump pair. The theory predicts the small-signal gain and bandwidth. A pump-depleted c"},"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":"2608.13288","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2026-08-13T14:23:55Z","cross_cats_sorted":[],"title_canon_sha256":"3e52837de04e71602a24a8a3f902ec352585dde059c2e6878cde92ae35953f94","abstract_canon_sha256":"b8c403afc95efde790762dcf2c28a178608734c87c1a01fb081ef7877ce4c454"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-08-14T01:04:08.583194Z","signature_b64":"8SkITjG/3IOBXSS66vn8IRHEk4/An/uSY70PMXo28NwNJx2uV0PL0pi/kqXC/crByT4x7UdhXwv/KjNk1+/5DA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"922d53d62971e4fa323168941363f07d04f5c936484a90a9e68971d9e9617716","last_reissued_at":"2026-08-14T01:04:08.581282Z","signature_status":"signed_v1","first_computed_at":"2026-08-14T01:04:08.581282Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Geometric Parametric Instability in Nonlinear Multipass Cells","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.optics","authors_text":"Chao Mei, G\\\"unter Steinmeyer, Jinhui Yuan, Jintao Fan, Junhong Yang, Peilong Yang, Qian Gao, Tao Sun","submitted_at":"2026-08-13T14:23:55Z","abstract_excerpt":"Geometric parametric instability (GPI) is the resonant growth of discrete spectral sidebands enabled by longitudinally periodic multimode evolution and has been studied primarily in graded-index fibers. Here we show theoretically and numerically that GPI can occur in gas-filled nonlinear multipass cells (MPCs). By mapping a mode-matched MPC onto an equivalent waveguide, we derive a Floquet quasi-phase-matching condition governed by the single-pass Gouy-phase imbalance of the signal--idler pair relative to the pump pair. The theory predicts the small-signal gain and bandwidth. A pump-depleted c"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2608.13288","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2608.13288/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":"2608.13288","created_at":"2026-08-14T01:04:08.582228+00:00"},{"alias_kind":"arxiv_version","alias_value":"2608.13288v1","created_at":"2026-08-14T01:04:08.582228+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2608.13288","created_at":"2026-08-14T01:04:08.582228+00:00"},{"alias_kind":"pith_short_12","alias_value":"SIWVHVRJOHSP","created_at":"2026-08-14T01:04:08.582228+00:00"},{"alias_kind":"pith_short_16","alias_value":"SIWVHVRJOHSPUMRR","created_at":"2026-08-14T01:04:08.582228+00:00"},{"alias_kind":"pith_short_8","alias_value":"SIWVHVRJ","created_at":"2026-08-14T01:04:08.582228+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/SIWVHVRJOHSPUMRRNCKBGY7QPU","json":"https://pith.science/pith/SIWVHVRJOHSPUMRRNCKBGY7QPU.json","graph_json":"https://pith.science/api/pith-number/SIWVHVRJOHSPUMRRNCKBGY7QPU/graph.json","events_json":"https://pith.science/api/pith-number/SIWVHVRJOHSPUMRRNCKBGY7QPU/events.json","paper":"https://pith.science/paper/SIWVHVRJ"},"agent_actions":{"view_html":"https://pith.science/pith/SIWVHVRJOHSPUMRRNCKBGY7QPU","download_json":"https://pith.science/pith/SIWVHVRJOHSPUMRRNCKBGY7QPU.json","view_paper":"https://pith.science/paper/SIWVHVRJ","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=2608.13288&json=true","fetch_graph":"https://pith.science/api/pith-number/SIWVHVRJOHSPUMRRNCKBGY7QPU/graph.json","fetch_events":"https://pith.science/api/pith-number/SIWVHVRJOHSPUMRRNCKBGY7QPU/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/SIWVHVRJOHSPUMRRNCKBGY7QPU/action/timestamp_anchor","attest_storage":"https://pith.science/pith/SIWVHVRJOHSPUMRRNCKBGY7QPU/action/storage_attestation","attest_author":"https://pith.science/pith/SIWVHVRJOHSPUMRRNCKBGY7QPU/action/author_attestation","sign_citation":"https://pith.science/pith/SIWVHVRJOHSPUMRRNCKBGY7QPU/action/citation_signature","submit_replication":"https://pith.science/pith/SIWVHVRJOHSPUMRRNCKBGY7QPU/action/replication_record"}},"created_at":"2026-08-14T01:04:08.582228+00:00","updated_at":"2026-08-14T01:04:08.582228+00:00"}