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Opt."],"published-print":{"date-parts":[[2026,5,10]]},"abstract":"<jats:p>We report the design and implementation of a compact external-cavity\n\t\t\t\t\tdiode laser (ECDL) for wavelength-tunable excitation around the GaAs\n\t\t\t\t\tbandgap. By modifying a commercial laser kit and redesigning key\n\t\t\t\t\toptomechanics, we achieve wide wavelength tunability over\n\t\t\t\t\t790\u2013870\u00a0nm. We describe a geometrical-optics design\n\t\t\t\t\tprocedure that accounts for the tuning-mirror pivot constraint,\n\t\t\t\t\ttogether with practical assembly and interference-mitigation measures\n\t\t\t\t\tfor wavelength-scanned operation. The ECDL operates in a single\n\t\t\t\t\tlongitudinal mode with a linewidth below several tens of MHz\n\t\t\t\t\t(measurement-limited) and delivers an optical output power of tens of\n\t\t\t\t\tmW across the tuning range. Free-running frequency drifts are on the\n\t\t\t\t\torder of 50\u00a0MHz over tens of seconds and 500\u00a0MHz over\n\t\t\t\t\ttens of minutes without active feedback.<\/jats:p>","DOI":"10.1364\/ao.588509","type":"journal-article","created":{"date-parts":[[2026,4,13]],"date-time":"2026-04-13T15:00:06Z","timestamp":1776092406000},"page":"4535","update-policy":"https:\/\/doi.org\/10.1364\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Wide-tuning-range Littman-type external-cavity diode laser for spectroscopy of GaAs band-edge and impurity-level transitions"],"prefix":"10.1364","volume":"65","author":[{"given":"Takayuki","family":"Ishida","sequence":"first","affiliation":[{"name":"University of Tsukuba"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Michio","family":"Ikezawa","sequence":"additional","affiliation":[{"name":"University of Tsukuba"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"285","published-online":{"date-parts":[[2026,4,30]]},"reference":[{"key":"ao-65-14-4535-R1","doi-asserted-by":"publisher","first-page":"44","DOI":"10.1109\/JQE.1981.1070634","type":"journal-article","volume":"17","author":"Fleming","year":"1981","journal-title":"IEEE J. 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