Facet temperature reduction by separate pumped window in high power laser diodes

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dc.citation.epage106822B-7en_US
dc.citation.spage106822B-1en_US
dc.contributor.authorArslan, Sevalen_US
dc.contributor.authorGündoğdu, Sinanen_US
dc.contributor.authorDemir, Abdullahen_US
dc.contributor.authorAydınlı, A.en_US
dc.coverage.spatialStrasbourg, Franceen_US
dc.date.accessioned2019-02-21T16:06:27Z
dc.date.available2019-02-21T16:06:27Z
dc.date.issued2018en_US
dc.departmentDepartment of Physicsen_US
dc.descriptionDate of Conference: 22-26 April 2018en_US
dc.descriptionConference Name: SPIE Photonics Europe, 2018en_US
dc.description.abstractThe main optical output power limitation in high power laser diodes is the catastrophic optical mirror damage (COMD) initiated by facet heating due to optical absorption, which limits the reliable power and lifetime of a single laser. Facet heating correlated with current injection near laser facets can be reduced by unpumped window structure. However, the high-power laser slope efficiency drops as the length of the window increases. In this work, separately pumped window (SPW) method is proposed and experimentally demonstrated to significantly reduce the facet temperature of the semiconductor lasers without compromising their performance. We used 5-mm long high-power laser diodes and compared its performance and facet temperature to the devices integrated with SPW facet sections, which are electrically isolated from the laser section. The slope efficiencies of the lasers with SPW and that of 5-mm lasers without SPW are comparable when SPW is pumped at its transparency current, illustrating that SPW integrated lasers preserve their slope efficiency. As the window pumping current increases, the threshold current of the laser with SPW decreases when the SPW approaches transparency. The facet temperature rise (ΔT) of the lasers were measured by the thermoreflectance method. The Î"T measured at waveguide regions of lasers was shown to be reduced by 42% implementing SPW region to conventional lasers. Therefore, SPW technique was shown to be a promising approach to increase the COMD level of the high-power laser diodes and it opens up a new avenue for reliable semiconductor laser operation at very high output power levels.en_US
dc.description.provenanceMade available in DSpace on 2019-02-21T16:06:27Z (GMT). No. of bitstreams: 1 Bilkent-research-paper.pdf: 222869 bytes, checksum: 842af2b9bd649e7f548593affdbafbb3 (MD5) Previous issue date: 2018en
dc.identifier.doi10.1117/12.2311642en_US
dc.identifier.issn0277-786Xen_US
dc.identifier.urihttp://hdl.handle.net/11693/50312en_US
dc.language.isoEnglishen_US
dc.publisherSPIEen_US
dc.relation.isversionofhttps://doi.org/10.1117/12.2311642en_US
dc.source.titleProceedings of the SPIE Vol. 10682, Semiconductor Lasers and Laser Dynamics VIIIen_US
dc.subjectCatastrophic optical mirror damageen_US
dc.subjectFacet temperatureen_US
dc.subjectHigh power laser diodesen_US
dc.subjectThermoreflectanceen_US
dc.titleFacet temperature reduction by separate pumped window in high power laser diodesen_US
dc.typeConference Paperen_US

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