{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,4]],"date-time":"2026-09-04T06:47:03Z","timestamp":1788504423343,"version":"build-2803163510"},"reference-count":27,"publisher":"Optica Publishing Group","issue":"7","license":[{"start":{"date-parts":[[2026,3,26]],"date-time":"2026-03-26T00:00:00Z","timestamp":1774483200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/doi.org\/10.1364\/OA_License_v2#VOR-OA"},{"start":{"date-parts":[[2026,3,26]],"date-time":"2026-03-26T00:00:00Z","timestamp":1774483200000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/opg.optica.org\/policies\/opg-tdm-policy.json"}],"funder":[{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"crossref","award":["52130201"],"award-info":[{"award-number":["52130201"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"crossref"},{"id":"https:\/\/ror.org\/01h0zpd94","id-type":"ROR","asserted-by":"publisher"}]},{"name":"Guangzhou Basic and Applied Basic Research Foundation","award":["2025A04J3521"],"award-info":[{"award-number":["2025A04J3521"]}]},{"DOI":"10.13039\/501100011269","name":"State Key Laboratory of Luminescent Materials and Devices","doi-asserted-by":"crossref","award":["South China University of Technology"],"award-info":[{"award-number":["South China University of Technology"]}],"id":[{"id":"10.13039\/501100011269","id-type":"DOI","asserted-by":"crossref"},{"id":"https:\/\/ror.org\/03d61dw70","id-type":"ROR","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100011269","name":"State Key Laboratory of Luminescent Materials and Devices","doi-asserted-by":"crossref","award":["SKLLMD-2025-12"],"award-info":[{"award-number":["SKLLMD-2025-12"]}],"id":[{"id":"10.13039\/501100011269","id-type":"DOI","asserted-by":"crossref"},{"id":"https:\/\/ror.org\/03d61dw70","id-type":"ROR","asserted-by":"publisher"}]}],"content-domain":{"domain":["opg.optica.org"],"crossmark-restriction":false},"short-container-title":["Opt. Express"],"published-print":{"date-parts":[[2026,4,6]]},"abstract":"<jats:p>\n                    Single-frequency fiber lasers (SFFLs) at 1.06\u2005\u03bcm with sub-kHz linewidth and low noise are pivotal for applications ranging from gravitational wave detection to coherent optical communication. In this work, we demonstrate a sub-kHz linewidth SFFL utilizing a custom-developed Yb\n                    <jats:sup>3+<\/jats:sup>\n                    -doped fluoro-sulfo-phosphate (FSP) fiber, distinguished by optimized spectral characteristics, superior stability, and a high gain coefficient of 5.6 dB\/cm. To suppress frequency noise without relying on complex electronic feedback, a self-injection locking technique was theoretically modeled and experimentally implemented. Furthermore, to circumvent the resolution limitations of traditional delayed self-heterodyne interferometry for sub-kHz sources, a precise linewidth determination method based on the coherent envelope of the signal was employed. Consequently, the linewidth of the Yb\n                    <jats:sup>3+<\/jats:sup>\n                    -doped FSP fiber SFFL was narrowed from 4 kHz to 512 Hz. The relative intensity noise was significantly suppressed to \u2212155 dB\/Hz, representing a 35 dB reduction compared to the free-running configuration while maintaining moderate output power and slope efficiency. These results demonstrate that combining high-gain FSP fiber with self-injection locking constitutes a robust, high-performance solution for precision laser sources.\n                  <\/jats:p>","DOI":"10.1364\/oe.592482","type":"journal-article","created":{"date-parts":[[2026,2,25]],"date-time":"2026-02-25T04:00:07Z","timestamp":1771992007000},"page":"12428","update-policy":"https:\/\/doi.org\/10.1364\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Sub-kHz linewidth, low noise single-frequency fiber laser based on Yb\n                    <sup>3+<\/sup>\n                    -doped fluoro-sulfo-phosphate fiber and self-injection locking"],"prefix":"10.1364","volume":"34","author":[{"given":"Jiaming","family":"Lin","sequence":"first","affiliation":[{"id":[{"id":"https:\/\/ror.org\/0530pts50","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xin","family":"Geng","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/0530pts50","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kaixuan","family":"Wu","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/0530pts50","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0005-3571-2221","authenticated-orcid":true,"given":"Yao","family":"Ji","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/0530pts50","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4597-3338","authenticated-orcid":true,"given":"Weichao","family":"Wang","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/0530pts50","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Qinyuan","family":"Zhang","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/0530pts50","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"285","published-online":{"date-parts":[[2026,3,26]]},"reference":[{"key":"oe-34-7-12428-R1","doi-asserted-by":"publisher","first-page":"30637","DOI":"10.1364\/OE.438787","type":"journal-article","volume":"29","author":"Fu","year":"2021","journal-title":"Opt. 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