Emission wavelength tuning of interband cascade lasers in the 3–4 μm spectral range

Bauer, A.; Langer, F.; Dallner, M.; Kamp, M.; Motyka, M.; Sęk, G.; Ryczko, K.; Misiewicz, J.; Höfling, S.; Forchel, A.
December 2009
Applied Physics Letters;12/21/2009, Vol. 95 Issue 25, p251103
Academic Journal
GaSb-based type-II quantum well (QW) structures and interband cascade lasers (ICLs) are investigated with regards to the dependence of emission wavelength on active QW thicknesses. Experimentally derived photoluminescence data and electrically driven ICL device data accompanied by theoretical calculations yield an average tuning rate of 0.55 μm per monolayer InAs in the range between 2.97 and 4.16 μm. Together with a temperature dependent ICL tuning behavior of 1.88 nm/K, the presented results provide the means for reliable and accurate emission wavelength control of ICLs in the 3–4 μm wavelength span which is of major importance for gas sensing applications.


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