Thermal characterisation of quantum cascade lasers with Fabry Perot modes

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buir.contributor.authorAydınlı, Atilla
dc.citation.volumeNumber10682en_US
dc.contributor.authorGündoğdu, Sinanen_US
dc.contributor.authorPisheh, Hadi Sedaghaten_US
dc.contributor.authorDemir, Abdullahen_US
dc.contributor.authorGünoven, M.en_US
dc.contributor.authorAydınlı, Atillaen_US
dc.contributor.authorSirtori, C.en_US
dc.coverage.spatialStrasbourg, Franceen_US
dc.date.accessioned2019-02-21T16:06:28Z
dc.date.available2019-02-21T16:06:28Z
dc.date.issued2018en_US
dc.departmentDepartment of Physicsen_US
dc.departmentDepartment of Mechanical Engineeringen_US
dc.departmentNanotechnology Research Center (NANOTAM)en_US
dc.descriptionConference name: Proceedings of SPIE, Semiconductor Lasers and Laser Dynamics VIIIen_US
dc.descriptionDate of Conference: 23–26 April 2018en_US
dc.description.abstractQuantum cascade lasers are coherent light sources that rely on intrersubband transition in periodic semiconductor quantum well structures. They operate at frequencies from mid-infrared to terahertz. In cases of long wavelength and typical low thermal conductivity of the active region, temperature rise in the active region during operation is a major concern. Thermal conductivity of QCL epi-layers differ significantly from the values of bulk semiconductors and measurement of the thermal conductivity of epi-layers is critical for design. It is well known that Fabry-Perot spectra of QCL cavities exhibit fine amplitude oscillations with frequency and can be used for real time in-situ temperature measurement. Phase of the modulation depends on the group refractive index of the cavity, which depends on the cavity temperature. We fabricated QCL devices with from 12, to 24 um mesa widths and 2mm cavity length and measured high resolution, high speed time resolved spectra using a FTIR spectrometer in step scan mode in a liquid nitrogen cooled, temperature controlled dewar. We used the time resolved spectra of QCLs to measure average temperature of the active region of the laser as a function of time. We examined the effect of pulse width and duty cycle on laser heating. We measured the temperature derivative of group refractive index of the cavity. Building a numerical model, we estimated the thermal conductivity of active region and calculated the heating of the QCL active region in pulsed mode for various waveguide widths.
dc.description.provenanceMade available in DSpace on 2019-02-21T16:06:28Z (GMT). No. of bitstreams: 1 Bilkent-research-paper.pdf: 222869 bytes, checksum: 842af2b9bd649e7f548593affdbafbb3 (MD5) Previous issue date: 2018en
dc.description.sponsorshipWe thank Turkish Scientific and Technological Research Agency (TUBITAK) for financial support under grant no: SANTEZ, 0573.STZ.2013-2
dc.identifier.doi10.1117/12.2311651
dc.identifier.isbn9781510618909
dc.identifier.issn0277-786X
dc.identifier.urihttp://hdl.handle.net/11693/50313
dc.language.isoEnglish
dc.publisherSPIEen_US
dc.relation.isversionofhttps://doi.org/10.1117/12.2311651
dc.source.titleProceedings of SPIE - The International Society for Optical Engineeringen_US
dc.subjectQuantum Cascade Lasersen_US
dc.subjectTemperatureen_US
dc.subjectThermal Conductivityen_US
dc.titleThermal characterisation of quantum cascade lasers with Fabry Perot modesen_US
dc.typeConference Paperen_US

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