Characterization of Quantum-Cascade Lasers Using Single-Pass Transmission Spectroscopy

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 st...

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Bibliographic Details
Published in:IEEE journal of quantum electronics 2009-06, Vol.45 (6), p.586-593
Main Authors: Dirisu, A.O., Revin, D.G., Zhijun Liu, Kennedy, K., Cockburn, J.W., Gmachl, C.F.
Format: Article
Language:English
Subjects:
Cascades
Design engineering
Exact sciences and technology
Extraterrestrial measurements
Fundamental areas of phenomenology (including applications)
Gain
Intersubband (ISB) absorption
Intersubband transitions
Laser materials
Laser transitions
Lasers
Magnetic field measurement
Optical design
optical gain
Optical materials
Optical refraction
Optical waveguides
Optics
Physics
Quality control
quantum cascade (QC) laser
Quantum cascade lasers
Quantum electronics
Semiconductor lasers
laser diodes
Semiconductor waveguides
Spectroscopy
Waveguide lasers
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Summary: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.
ISSN:0018-9197
1558-1713
DOI:10.1109/JQE.2009.2013108