{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:FSOE3FYBFSM5HG5BP4LDJGV4QN","short_pith_number":"pith:FSOE3FYB","canonical_record":{"source":{"id":"1507.03188","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2015-07-12T05:28:41Z","cross_cats_sorted":[],"title_canon_sha256":"9c9b944361850cf16b3f87b1be49aacc01e7c31ad536421230d89f5a089f7a20","abstract_canon_sha256":"44482c94c22086d0dd29aec6a3d412241a0aa6143d7f13e9b10d0ec8cea85a3e"},"schema_version":"1.0"},"canonical_sha256":"2c9c4d97012c99d39ba17f16349abc835f2b32087c69f2fff0cd5a9d9cafcb58","source":{"kind":"arxiv","id":"1507.03188","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1507.03188","created_at":"2026-05-18T01:36:59Z"},{"alias_kind":"arxiv_version","alias_value":"1507.03188v1","created_at":"2026-05-18T01:36:59Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1507.03188","created_at":"2026-05-18T01:36:59Z"},{"alias_kind":"pith_short_12","alias_value":"FSOE3FYBFSM5","created_at":"2026-05-18T12:29:22Z"},{"alias_kind":"pith_short_16","alias_value":"FSOE3FYBFSM5HG5B","created_at":"2026-05-18T12:29:22Z"},{"alias_kind":"pith_short_8","alias_value":"FSOE3FYB","created_at":"2026-05-18T12:29:22Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:FSOE3FYBFSM5HG5BP4LDJGV4QN","target":"record","payload":{"canonical_record":{"source":{"id":"1507.03188","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2015-07-12T05:28:41Z","cross_cats_sorted":[],"title_canon_sha256":"9c9b944361850cf16b3f87b1be49aacc01e7c31ad536421230d89f5a089f7a20","abstract_canon_sha256":"44482c94c22086d0dd29aec6a3d412241a0aa6143d7f13e9b10d0ec8cea85a3e"},"schema_version":"1.0"},"canonical_sha256":"2c9c4d97012c99d39ba17f16349abc835f2b32087c69f2fff0cd5a9d9cafcb58","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:36:59.445943Z","signature_b64":"43fjgSMuEydbs04XFu2RP38mo+vCLBb4Yo9TZ4R9OJ/ClgOC8BhQiLUkdRwoL+ZytdHXTzfiDWFMv4myqYMHBA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"2c9c4d97012c99d39ba17f16349abc835f2b32087c69f2fff0cd5a9d9cafcb58","last_reissued_at":"2026-05-18T01:36:59.445158Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:36:59.445158Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1507.03188","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":"2026-05-18T01:36:59Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"gDVY+OZ9W0qx/hYa8yw27WV4nbGsEXT+aBbcUpLgPdKZc8vPO1TUHAAtcRviIbqZRXiXUWE7WiZ6cqtSK2WACQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T00:15:04.321031Z"},"content_sha256":"0dc4d8c91680fada7f6887aa620bccdfb49ce5945aa92b23840d31262e882545","schema_version":"1.0","event_id":"sha256:0dc4d8c91680fada7f6887aa620bccdfb49ce5945aa92b23840d31262e882545"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:FSOE3FYBFSM5HG5BP4LDJGV4QN","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Yb- and Er-doped fiber laser Q-switched with an optically uniform, broadband WS2 saturable absorber","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.optics","authors_text":"G. Hu, L. Chen, M. Zhang, R. C. T. Howe, T. Hasan, Z. Zheng","submitted_at":"2015-07-12T05:28:41Z","abstract_excerpt":"We demonstrate a ytterbium (Yb) and an erbium (Er)-doped fiber laser Q-switched by a solution processed, optically uniform, few-layer tungsten disulfide saturable absorber (WS2-SA). Nonlinear optical absorption of the WS2-SA in the sub-bandgap region, attributed to the edge-induced states, is characterized by 3.1% and 4.9% modulation depths with 1.38 and 3.83 MW/cm2 saturation intensities at 1030 and 1558 nm, respectively. By integrating the optically uniform WS2-SA in the Yb- and Er-doped laser cavities, we obtain self-starting Q-switched pulses with microsecond duration and kilohertz repetit"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1507.03188","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":"2026-05-18T01:36:59Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"OqYE/s52TfK7f6ycWZKQkxmSStT+1yQ1Zre8YqNhKUXEof1F+kLqasmg42Wi70/vXPGvS4vGiheJUJ1ahfukCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T00:15:04.321746Z"},"content_sha256":"404ba9995e7310cf99df2b2aa676f8bb95bc7f7b9bcbe40b46d421b048d9409d","schema_version":"1.0","event_id":"sha256:404ba9995e7310cf99df2b2aa676f8bb95bc7f7b9bcbe40b46d421b048d9409d"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/FSOE3FYBFSM5HG5BP4LDJGV4QN/bundle.json","state_url":"https://pith.science/pith/FSOE3FYBFSM5HG5BP4LDJGV4QN/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/FSOE3FYBFSM5HG5BP4LDJGV4QN/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":"2026-06-01T00:15:04Z","links":{"resolver":"https://pith.science/pith/FSOE3FYBFSM5HG5BP4LDJGV4QN","bundle":"https://pith.science/pith/FSOE3FYBFSM5HG5BP4LDJGV4QN/bundle.json","state":"https://pith.science/pith/FSOE3FYBFSM5HG5BP4LDJGV4QN/state.json","well_known_bundle":"https://pith.science/.well-known/pith/FSOE3FYBFSM5HG5BP4LDJGV4QN/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:FSOE3FYBFSM5HG5BP4LDJGV4QN","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":"44482c94c22086d0dd29aec6a3d412241a0aa6143d7f13e9b10d0ec8cea85a3e","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2015-07-12T05:28:41Z","title_canon_sha256":"9c9b944361850cf16b3f87b1be49aacc01e7c31ad536421230d89f5a089f7a20"},"schema_version":"1.0","source":{"id":"1507.03188","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1507.03188","created_at":"2026-05-18T01:36:59Z"},{"alias_kind":"arxiv_version","alias_value":"1507.03188v1","created_at":"2026-05-18T01:36:59Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1507.03188","created_at":"2026-05-18T01:36:59Z"},{"alias_kind":"pith_short_12","alias_value":"FSOE3FYBFSM5","created_at":"2026-05-18T12:29:22Z"},{"alias_kind":"pith_short_16","alias_value":"FSOE3FYBFSM5HG5B","created_at":"2026-05-18T12:29:22Z"},{"alias_kind":"pith_short_8","alias_value":"FSOE3FYB","created_at":"2026-05-18T12:29:22Z"}],"graph_snapshots":[{"event_id":"sha256:404ba9995e7310cf99df2b2aa676f8bb95bc7f7b9bcbe40b46d421b048d9409d","target":"graph","created_at":"2026-05-18T01:36:59Z","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 demonstrate a ytterbium (Yb) and an erbium (Er)-doped fiber laser Q-switched by a solution processed, optically uniform, few-layer tungsten disulfide saturable absorber (WS2-SA). Nonlinear optical absorption of the WS2-SA in the sub-bandgap region, attributed to the edge-induced states, is characterized by 3.1% and 4.9% modulation depths with 1.38 and 3.83 MW/cm2 saturation intensities at 1030 and 1558 nm, respectively. By integrating the optically uniform WS2-SA in the Yb- and Er-doped laser cavities, we obtain self-starting Q-switched pulses with microsecond duration and kilohertz repetit","authors_text":"G. Hu, L. Chen, M. Zhang, R. C. T. Howe, T. Hasan, Z. Zheng","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2015-07-12T05:28:41Z","title":"Yb- and Er-doped fiber laser Q-switched with an optically uniform, broadband WS2 saturable absorber"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1507.03188","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":"sha256:0dc4d8c91680fada7f6887aa620bccdfb49ce5945aa92b23840d31262e882545","target":"record","created_at":"2026-05-18T01:36:59Z","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":"44482c94c22086d0dd29aec6a3d412241a0aa6143d7f13e9b10d0ec8cea85a3e","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2015-07-12T05:28:41Z","title_canon_sha256":"9c9b944361850cf16b3f87b1be49aacc01e7c31ad536421230d89f5a089f7a20"},"schema_version":"1.0","source":{"id":"1507.03188","kind":"arxiv","version":1}},"canonical_sha256":"2c9c4d97012c99d39ba17f16349abc835f2b32087c69f2fff0cd5a9d9cafcb58","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"2c9c4d97012c99d39ba17f16349abc835f2b32087c69f2fff0cd5a9d9cafcb58","first_computed_at":"2026-05-18T01:36:59.445158Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:36:59.445158Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"43fjgSMuEydbs04XFu2RP38mo+vCLBb4Yo9TZ4R9OJ/ClgOC8BhQiLUkdRwoL+ZytdHXTzfiDWFMv4myqYMHBA==","signature_status":"signed_v1","signed_at":"2026-05-18T01:36:59.445943Z","signed_message":"canonical_sha256_bytes"},"source_id":"1507.03188","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:0dc4d8c91680fada7f6887aa620bccdfb49ce5945aa92b23840d31262e882545","sha256:404ba9995e7310cf99df2b2aa676f8bb95bc7f7b9bcbe40b46d421b048d9409d"],"state_sha256":"29f732499a1dcadee2c7f2b6e7b5cb9c137c1e3ae50d96684d63fedbddeeac60"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"lG/TMlSUhkcjA3NApolXj8TrHZOOiNslWbpxMAINwjLylM0trfU7ZYVx/SVtanmk/JfLUrXur9PSGb9nI6YHAA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-01T00:15:04.325597Z","bundle_sha256":"8a5dfc4e2713eb30b9c01885ce341c8f27ae92562dd74fe7043e6514b361147d"}}