High-performance, homogeneous broad-gain quantum cascade lasers based on dual-upper-state design

Fujita, Kazuue; Edamura, Tadataka; Furuta, Shinichi; Yamanishi, Masamichi
June 2010
Applied Physics Letters;6/14/2010, Vol. 96 Issue 24, p241107
Academic Journal
A broad-gain quantum cascade laser design with dual-upper-state is proposed to clarify its own feasibility. Devices employing the proposed active region design exhibit homogeneously wide (>330 cm-1) electroluminescence spectra of which shapes are insensitive to voltage changes. A buried heterostructure laser, emitting at λ∼8.4 μm, demonstrates a high continuous-wave output power of 152 mW together with a high constant slope efficiency of 518 W/A at room temperature. In addition, the device performance is observed to be very insensitive to temperature change; T0-values of ∼306 K and constant slope efficiency over the wide temperature range, 280–400 K.


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