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The frequency noise is measured using a cross-correlated self-heterodyne frequency discriminator, and two estimations of integrated linewidth are evaluated using 1\/\n                    <jats:italic toggle=\"yes\">\u03c0<\/jats:italic>\n                    integration and\n                    <jats:italic toggle=\"yes\">\u03b2<\/jats:italic>\n                    -separation line integration methods.\n                  <\/jats:p>","DOI":"10.1364\/oe.525498","type":"journal-article","created":{"date-parts":[[2024,5,29]],"date-time":"2024-05-29T04:00:42Z","timestamp":1716955242000},"page":"23372","update-policy":"https:\/\/doi.org\/10.1364\/crossmark_policy","source":"Crossref","is-referenced-by-count":26,"title":["Blue GaN-based DFB laser diode with sub-MHz linewidth"],"prefix":"10.1364","volume":"32","author":[{"ORCID":"https:\/\/orcid.org\/0009-0008-1112-243X","authenticated-orcid":true,"given":"Emily","family":"Trageser","sequence":"first","affiliation":[{"id":[{"id":"https:\/\/ror.org\/02t274463","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Haojun","family":"Zhang","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/02t274463","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sonya","family":"Palmer","sequence":"additional","affiliation":[{"name":"RMIT University"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9861-7065","authenticated-orcid":true,"given":"Theodore","family":"Morin","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/02t274463","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0203-5170","authenticated-orcid":true,"given":"Joel","family":"Guo","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/02t274463","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7207-8515","authenticated-orcid":true,"given":"Jiaao","family":"Zhang","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/02t274463","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Evan","family":"Geske","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/02t274463","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Heming","family":"Wang","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/02t274463","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8443-3396","authenticated-orcid":true,"given":"Andreas","family":"Boes","sequence":"additional","affiliation":[{"name":"RMIT University"},{"name":"The University of Adelaide"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shuji","family":"Nakamura","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/02t274463","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4270-8296","authenticated-orcid":true,"given":"John E.","family":"Bowers","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/02t274463","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Steven P.","family":"DenBaars","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/02t274463","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"285","published-online":{"date-parts":[[2024,6,11]]},"reference":[{"key":"oe-32-13-23372-R1","doi-asserted-by":"publisher","first-page":"063101","DOI":"10.1063\/1.4808246","volume":"84","author":"Shimada","year":"2013","journal-title":"Rev. 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