Demonstration of a Quick Process to Achieve Buried Heterostructure QCL Leading to High Power and Wall Plug Efficiency
2014 (English)In: LASER TECHNOLOGY FOR DEFENSE AND SECURITY X, 2014, Vol. 9081, 90810O- p.Conference paper (Refereed)
Together with the optimal basic design, buried heterostructure quantum cascade laser (BH-QCL) with semi-insulating regrowth offers unique possibility to achieve an effective thermal dissipation and lateral single mode. We demonstrate here for the first time realization of BH-QCLs with a single step regrowth of highly resistive (>1x10(8) ohm.cm) semi-insulating InP:Fe in less than 45 minutes in a flexible hydride vapour phase epitaxy process for burying ridges etched down to 10-15 mu m deep both with and without mask overhang. The fabricated BH-QCLs emitting at similar to 4.7 mu m and similar to 5.5 mu m were characterized. 2 mm long 5.5 mu m lasers with ridge width 17-22 mu m, regrown with mask overhang, exhibited no leakage current. Large width and high doping in the structure did not permit high current density for CW operation. 5 mm long 4.7 mu m BH-QCLs of ridge widths varying from 6-14 mu m regrown without mask overhang, besides being spatially monomode, TM00, exhibited WPE of similar to 8-9% with an output power of 1.5 - 2.5 W at room temperature and under CW operation. Thus, we demonstrate a simple, flexible, quick, stable and single-step regrowth process with extremely good planarization for realizing buried QCLs leading to monomode, high power and high WPE.
Place, publisher, year, edition, pages
2014. Vol. 9081, 90810O- p.
, Proceedings of SPIE, ISSN 0277-786X ; 9081
Buried heterostructure quantum cascade lasers, high power QCL, High WPE QCL, HVPE regrowth
Electrical Engineering, Electronic Engineering, Information Engineering
IdentifiersURN: urn:nbn:se:kth:diva-154777DOI: 10.1117/12.2053003ISI: 000342289500013ScopusID: 2-s2.0-84904759280OAI: oai:DiVA.org:kth-154777DiVA: diva2:759589
Conference on Laser Technology for Defense and Security X, MAY 06-07, 2014, Baltimore, MD, United States
QC 201410302014-10-302014-10-272014-10-30Bibliographically approved