{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,5]],"date-time":"2026-10-05T14:50:44Z","timestamp":1791211844669,"version":"4.1.0"},"reference-count":24,"publisher":"Optica Publishing Group","issue":"19","license":[{"start":{"date-parts":[[2026,9,30]],"date-time":"2026-09-30T00:00:00Z","timestamp":1790726400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/doi.org\/10.1364\/OA_License_v2#VOR-OA"},{"start":{"date-parts":[[2026,9,30]],"date-time":"2026-09-30T00:00:00Z","timestamp":1790726400000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/opg.optica.org\/policies\/opg-tdm-policy.json"}],"content-domain":{"domain":["opg.optica.org"],"crossmark-restriction":false},"short-container-title":["Opt. Lett."],"published-print":{"date-parts":[[2026,10,1]]},"abstract":"<jats:p>We demonstrate blue-shifted few-cycle pulse generation in a short\n\t\t\t\t\tKrypton-filled capillary fiber operated near the self-focusing\n\t\t\t\t\tthreshold. Using a 25\u2009cm capillary, the propagation remains\n\t\t\t\t\tsufficiently short to limit the buildup of accumulated nonlinear\n\t\t\t\t\teffects and to access the early self-focusing-driven dynamics.\n\t\t\t\t\tExperimentally, the onset of weak self-focusing is accompanied by\n\t\t\t\t\tstable sideband generation, spatial confinement of the blue-shifted\n\t\t\t\t\tfrequencies, and progressive temporal self-compression as the spectrum\n\t\t\t\t\tbroadens. Multimode simulations support a short-distance self-action\n\t\t\t\t\tpicture in which energy is redistributed from the fundamental mode\n\t\t\t\t\tinto low-order radially symmetric modes, followed by rapid,\n\t\t\t\t\tblue-shifted spectral broadening. These results demonstrate that\n\t\t\t\t\tnear-threshold self-focusing in weakly confined gas-filled capillary\n\t\t\t\t\tfibers can be used as a controllable route to energetic few-cycle\n\t\t\t\t\tvisible\/ultraviolet pulses and as a platform for studying multimode\n\t\t\t\t\tnonlinear dynamics.<\/jats:p>","DOI":"10.1364\/ol.608520","type":"journal-article","created":{"date-parts":[[2026,9,8]],"date-time":"2026-09-08T12:00:11Z","timestamp":1788868811000},"page":"5573","update-policy":"https:\/\/doi.org\/10.1364\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Spatially confined self-compressed blue-shifted few-cycle pulses from gas-filled capillary fibers"],"prefix":"10.1364","volume":"51","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2848-4196","authenticated-orcid":true,"given":"Bahareh Hosseini","family":"Fakhar","sequence":"first","affiliation":[{"id":[{"id":"https:\/\/ror.org\/04td37d32","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Behnam","family":"Azizi","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/04td37d32","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zeinab","family":"Norouzinik","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/04td37d32","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hossein","family":"Soltanian","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/04td37d32","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0000-5485-1490","authenticated-orcid":true,"given":"Samuel","family":"Brochu","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/04td37d32","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Logan G.","family":"Wright","sequence":"additional","affiliation":[{"name":"Yale University"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3065-7156","authenticated-orcid":true,"given":"Fran\u00e7ois","family":"L\u00e9gar\u00e9","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/04td37d32","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Reza","family":"Safaei","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/04td37d32","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"285","published-online":{"date-parts":[[2026,9,30]]},"reference":[{"key":"ol-51-19-5573-R1","doi-asserted-by":"publisher","first-page":"2793","DOI":"10.1063\/1.116609","type":"journal-article","volume":"68","author":"Nisoli","year":"1996","journal-title":"Appl. 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