Abstract
A broad-area midinfrared interband cascade (IC) laser has been demonstrated with a threshold current as low as ∼630A∕cm2 at 300K. Despite exhibiting a large specific thermal resistance (∼56Kcm2∕kW at 172K), the device delivered cw power near 200mW/facet at 500mA and at 83K and lased in cw mode up to 172K. A 0.5-mm-long laser delivered cw power of ∼253mW/facet at 400mA and at 82K, and had power efficiency as high as 26% at ∼80K. Narrow mesa stripe IC lasers had relatively higher threshold current density, yet lased at temperatures up to 237 and 350K in cw and pulsed modes, respectively. The feasibility of cw operation at higher temperatures and directions for improving IC laser performance are discussed based on the experimental data.
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