DocumentCode :
748888
Title :
Characterization of Quantum-Cascade Lasers Using Single-Pass Transmission Spectroscopy
Author :
Dirisu, Afusat O. ; Revin, Dmitry G. ; Liu, Zhijun ; Kennedy, Kenneth ; Cockburn, John W. ; Gmachl, Claire F.
Author_Institution :
Dept. of Electr. Eng., Princeton Univ., Princeton, NJ
Volume :
45
Issue :
6
fYear :
2009
fDate :
6/1/2009 12:00:00 AM
Firstpage :
586
Lastpage :
593
Abstract :
The study of the electron distribution and intersubband transitions in quantum cascade (QC) lasers provides fundamental insights into the laser operation. Measurements on intersubband transitions are often performed on QC lasers under nonoperating conditions, i.e., at zero electric field. In this study, a single-pass transmission technique that allows for probing of QC lasers under operating conditions was used. The measurements and analysis were done on QC lasers with vertical and diagonal transition active region designs operating at lambda ~ 10 mum. The single-pass modal gain coefficients, extracted for the vertical transition design, were 24.04 cm/kA at 100 K, 21.36 cm/kA at 125 K, 14.25 cm/kA at 150 K, and 5.26 cm/kA at 175 K.
Keywords :
light absorption; quantum cascade lasers; spectroscopy; electron distribution; intersubband transitions; quantum cascade lasers; single pass transmission spectroscopy; temperature 100 K; temperature 125 K; temperature 150 K; temperature 175 K; Extraterrestrial measurements; Laser transitions; Magnetic field measurement; Optical design; Optical refraction; Optical waveguides; Quantum cascade lasers; Semiconductor waveguides; Spectroscopy; Waveguide lasers; Intersubband (ISB) absorption; optical gain; quantum cascade (QC) laser; spectroscopy;
fLanguage :
English
Journal_Title :
Quantum Electronics, IEEE Journal of
Publisher :
ieee
ISSN :
0018-9197
Type :
jour
DOI :
10.1109/JQE.2009.2013108
Filename :
4838889
Link To Document :
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