Spectroscopic study of transparency current in mid-infrared quantum cascade lasers.
OPTICS EXPRESS(2012)
摘要
We report measurements which give direct insight into the origins of the transparency current for lambda similar to 5 mu 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. (C) 2012 Optical Society of America
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关键词
transparency current,lasers,spectroscopic study,mid-infrared
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