NDLI: Measurement of internal quantum efficiency and temperature dependence of gain and loss in interband cascade lasers near room-temperature

Content Provider	IEEE Xplore Digital Library
Author	Chryssis, A. Geunmin Ryu Dagenais, M.
Copyright Year	2010
Description	Author affiliation: Department of Electrical and Computer Engineering, University of Maryland, College Park, 20742, USA (Chryssis, A.; Geunmin Ryu; Dagenais, M.)
Abstract	Recently, type-II interband cascade (IC) lasers operating around 3.5 µm have demonstrated continuous wave (cw) operation at room temperature [1]. Even though getting room-temperature operation was an important achievement, a cw power of only 10 mW was reported. It is very important to be able to substantially increase this power in order to meet the requirements for several applications of these lasers in spectroscopy, environment monitoring, medicine and counter measures. This can be done by increasing the modal gain in these lasers, at the same time reducing the cavity losses. It is important to understand if there is any temperature dependence of the losses and internal quantum efficiency in these lasers. In contrast to previous reports [2–3], we demonstrate that the loss coefficient of 6 and 12 cascade IC lasers is temperature independent over the temperature range of 240 to 300 K. These lasers have an n-doped 200 nm symmetrical separate confinement region. A loss coefficient of 7–8 $cm^{−1}$ is demonstrated, which compares to the best loss results obtained so far. Measurement on a 12 cascade IC laser with a p-doped separate confinement region indicates a cavity loss of 14 $cm^{−1},$ in agreement with the expectation of higher losses for p-doped layers. An internal quantum efficiency of 80 % is measured at 240 K. A temperature dependence of the gain coefficient given by T = 44.5 K is measured and is in agreement with the known threshold dependence on temperature in these lasers. This suggests that Auger recombination is playing an important role in these lasers.
Starting Page	43
Ending Page	44
File Size	116342
Page Count	2
File Format	PDF
ISBN	9781424456833
ISSN	08999406
e-ISBN	9781424456840
DOI	10.1109/ISLC.2010.5642762
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-09-26
Publisher Place	Japan
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Quantum cascade lasers Temperature measurement Measurement by laser beam Loss measurement Current measurement Integrated circuits Semiconductor device measurement
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Electrical and Electronic Engineering

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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