Mechanism of the temperature sensitivity of mid-infrared GaSb-based semiconductor lasers

Suchalkin, S.; Shterengas, L.; Kisin, M.; Luryi, S.; Belenky, G.; Kaspi, R.; Ongstad, A.; Kim, J. G.; Martinelli, R. U.
July 2005
Applied Physics Letters;7/25/2005, Vol. 87 Issue 4, p041102
Academic Journal
The sources of temperature sensitivity of the threshold current in type-I and type-II mid-infrared semiconductor lasers are investigated. Measurements of the interband optical absorption allow direct comparison of the optical matrix elements in laser structures with type-I and type-II band alignments and prove that the difference in the optical matrix elements is insignificant for these two groups of structures. We show that thermally-induced hole escape from the active quantum wells strongly deteriorates the optical emission in both type heterostructures. Experiments show that the temperature decay of PL is generally stronger for type-II samples.


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