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Lett."],"published-print":{"date-parts":[[2026,10,1]]},"abstract":"<jats:p>\n                    Hollow-core anti-resonant fibers (HC-ARFs) provide an attractive platform for high-power laser delivery because most of the optical field propagates in air, enabling high damage thresholds, weak light-silica interaction, and low optical nonlinearity. Here, we demonstrate all-fiber delivery of 1338\u2009W continuous-wave laser power through a 2-m HC-ARF with a 14-\u00b5m mode-field diameter and a coupling efficiency of 97.1%. Efficient coupling is achieved by fusion splicing a mode-matched solid-core delivery fiber to the HC-ARF with an anti-reflection-coated end face and optimized offset-arc parameters. The fiber shows negligible bend-induced loss for bend diameters down to 13\u2009cm, supporting compact and flexible deployment. Furthermore, the system enables passive beam cleaning, improving the beam quality factor (M\n                    <jats:sup>2<\/jats:sup>\n                    ) from 1.25 to 1.15 via the preferential attenuation of higher-order modes. This compact all-fiber HC-ARF system combines a small mode field, kilowatt-level power density, and near-diffraction-limited beam quality, offering stable and flexible delivery of high-quality beams.\n                  <\/jats:p>","DOI":"10.1364\/ol.615858","type":"journal-article","created":{"date-parts":[[2026,9,15]],"date-time":"2026-09-15T19:00:07Z","timestamp":1789498807000},"page":"5637","update-policy":"https:\/\/doi.org\/10.1364\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["All-fiber delivery of 1.3 kW laser power through a hollow-core anti-resonant fiber with a 14 \u03bcm mode field diameter"],"prefix":"10.1364","volume":"51","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6181-5965","authenticated-orcid":true,"given":"Weiqing","family":"Gao","sequence":"first","affiliation":[{"id":[{"id":"https:\/\/ror.org\/02czkny70","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tianhao","family":"Hu","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/02czkny70","id-type":"ROR","asserted-by":"publisher"}]},{"name":"Yangtze Optical Fiber and Cable Joint Stock Limited Company (YOFC)"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lu","family":"Dai","sequence":"additional","affiliation":[{"name":"Yangtze Optical Fiber and Cable Joint Stock Limited Company (YOFC)"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ziqi","family":"Zheng","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/02czkny70","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Haitao","family":"Tan","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/02czkny70","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jiayi","family":"Liu","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/02czkny70","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"YiFei","family":"Xu","sequence":"additional","affiliation":[{"name":"Yangtze Optical Fiber and Cable Joint Stock Limited Company (YOFC)"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jun","family":"Chu","sequence":"additional","affiliation":[{"name":"Yangtze Optical Fiber and Cable Joint Stock Limited Company (YOFC)"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lei","family":"Zhang","sequence":"additional","affiliation":[{"name":"Yangtze Optical Fiber and Cable Joint Stock Limited Company (YOFC)"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7402-2024","authenticated-orcid":true,"given":"Yong","family":"Zhou","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/02czkny70","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"285","published-online":{"date-parts":[[2026,10,1]]},"reference":[{"key":"ol-51-19-5637-R1","first-page":"24","author":"Mohammed","year":"2015"},{"key":"ol-51-19-5637-R2","doi-asserted-by":"publisher","first-page":"92940C","DOI":"10.1117\/12.2072617","type":"journal-article","volume":"92940C1","author":"Qu","year":"2014","journal-title":"Int. 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All rights, including for text and data mining (TDM), Artificial Intelligence (AI) training, and similar technologies, are reserved.","name":"copyright","label":"Copyright"}]}}