Spectroscopic study of transparency current in mid-infrared quantum cascade lasers. Academic Article

abstract

• We report measurements which give direct insight into the origins of the transparency current for ~5 m In0.6Ga0.4As/In0.42Al0.58As quantum cascade lasers in the temperature range of 80-280 K. The transparency current values have been found from broadband transmission measurements through the laser waveguides under sub-threshold operating conditions. Two active region designs were compared. The active region of the first laser is based on double-LO-phonon relaxation approach, while the second device has only one lower level, without specially designed resonant LO-phonon assisted depopulation. It is shown that transparency current contributes more than 70% to the magnitude of threshold current at high temperatures for both designs.

authors

• Belyanin, Alexey

published proceedings

• Opt Express

author list (cited authors)

• Revin, D. G., Hassan, R. S., Krysa, A. B., Wang, Y., Belyanin, A., Kennedy, K., Atkins, C. N., & Cockburn, J. W.

citation count

• 2

complete list of authors

• Revin, Dmitry G||Hassan, Randa S||Krysa, Andrey B||Wang, Yongrui||Belyanin, Alexey||Kennedy, Kenneth||Atkins, Chris N||Cockburn, John W

publication date

• August 2012

publisher

• Optica Publishing Group  Publisher

keywords

• Computer-Aided Design
• Equipment Design
• Equipment Failure Analysis
• Infrared Rays
• Lasers
• Quantum Theory
• Spectrophotometry, Infrared
• Surface Plasmon Resonance

Digital Object Identifier (DOI)

• 10.1364/OE.20.018925

start page

• 18925

end page

• 18930

volume

• 20

issue

• 17

URL

• http%3A%2F%2Fdx.doi.org%2F10.1364%2Foe.20.018925