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Express"],"published-print":{"date-parts":[[2026,3,23]]},"abstract":"<jats:p>\n                    A beam shaping approach employing a single spatial light modulator to generate uniform light sheets in an optical fiber is presented for the direct fabrication of fiber Bragg gratings using femtosecond laser radiation. A Gaussian beam is transformed into a narrow 700\u2009\n                    <jats:roman toggle=\"no\">nm<\/jats:roman>\n                    light sheet by uniquely combining astigmatism, a one-dimensional axicon, and higher-order phase corrections to enable aberration-free air focusing into the core of a standard telecommunications fiber for plane-by-plane grating inscription. First-order single-pulse devices targeting 1570\u2009\n                    <jats:roman toggle=\"no\">nm<\/jats:roman>\n                    and 863\u2009\n                    <jats:roman toggle=\"no\">nm<\/jats:roman>\n                    wavelengths are reported with minimal insertion losses and reduced cladding mode coupling, achieving a sub-300\u2009\n                    <jats:roman toggle=\"no\">nm<\/jats:roman>\n                    feature size and low birefringence. Comparison of single-pulse and multi-pulse formation of the grating elements indicates a further reduction in coupling to cladding modes with a 1000-pulse burst envelope.\n                  <\/jats:p>","DOI":"10.1364\/oe.587081","type":"journal-article","created":{"date-parts":[[2026,2,16]],"date-time":"2026-02-16T09:00:09Z","timestamp":1771232409000},"page":"9856","update-policy":"https:\/\/doi.org\/10.1364\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Shaping an ultrafast laser light sheet for inscription of fiber Bragg gratings"],"prefix":"10.1364","volume":"34","author":[{"given":"Polina","family":"Zavyalova","sequence":"first","affiliation":[{"id":[{"id":"https:\/\/ror.org\/03dbr7087","id-type":"ROR","asserted-by":"publisher"}]},{"name":"10 King\u2019s College Rd."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0767-8135","authenticated-orcid":true,"given":"Suresh","family":"Sivanandam","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/03dbr7087","id-type":"ROR","asserted-by":"publisher"}]},{"name":"University of Toronto"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Peter R.","family":"Herman","sequence":"additional","affiliation":[{"name":"10 King\u2019s College Rd."}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"285","published-online":{"date-parts":[[2026,3,11]]},"reference":[{"key":"oe-34-6-9856-R1","doi-asserted-by":"publisher","first-page":"995","DOI":"10.1364\/OL.28.000995","type":"journal-article","volume":"28","author":"Mihailov","year":"2003","journal-title":"Opt. 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