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journal article·2020-08-01Open access

Output facet heating mechanism for uncoated high power long wave infrared quantum cascade lasers

Dagan Hathaway, Monas Shahzad, Tamil S. Sakthivel, Matthew Suttinger, Rowel Go, Enrique Sanchez, Sudipta Seal, Hong Shu, Arkadiy Lyakh

AIP Advances· Volume 10· Issue 8
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Source abstract

Abstract

Output facet temperatures of an uncoated high power continuous-wave quantum cascade laser (QCL) emitting at 8.5 μm were measured by using micro-Raman thermometry. The rate of the measured temperature changes with the injected electrical power increased from 6.5 K/W below the laser threshold to 12.3 K/W above the threshold. In addition, the measured temperature rise exceeded 220 K at an optical power of 0.9 W, well above the model projections based only on Joule heating. Facet oxidation was characterized via x-ray photoelectron spectroscopy measurements at incremental etch depths. While the oxidation reactions of InP and Ga were observed only at the surface level, the measured penetration of native Al2O3 was ∼24 nm. COMSOL thermal modeling demonstrated that light reabsorption by the native Al2O3 layer could well explain the additional temperature rise above the threshold. These results suggest that facet oxidation must be addressed to ensure the reliability of high-power long wave infrared QCLs.
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Research context

OpenAlex topics: Spectroscopy and Laser Applications · Advanced Sensor Technologies Research · Laser Design and Applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

NanoScience Technology Center, University of Central Florida 1 , 12424 Research Pkwy, Orlando, Florida 32826, USA

College of Optics and Photonics, University of Central Florida 2 , 4304 Scorpius St., Orlando, Florida 32816, USA

Department of Materials Science and Engineering and Advanced Materials Processing and Analysis Center, University of Central Florida 3 , 12760 Pegasus Drive, Orlando, Florida 32816, USA

Department of Electrical & Computer Engineering, University of Central Florida 4 , 4328 Scorpius Street, Orlando, Florida 32816, USA

College of Medicine, University of Central Florida 5 , Orlando, Florida 32827, USA

IRGLARE, LLC 6 , 3259 Progress Drive, Orlando, Florida 32826, USA

Department of Physics, University of Central Florida 7 , 4111, Libra Dr., Orlando, Florida 32816, USA

Funding

National Science Foundation · Air Force Office of Scientific Research · Naval Air Warfare Center, Aircraft Division

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