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Type-II “W” diode lasers with ten quantum-well periods operated in pulsed mode to 315K, where the emission wavelength was 4.02μm. The devices with uncoated facets had a threshold current density of 145A∕cm2 and slope efficiency of 47mW∕A per facet at 78K, and displayed a characteristic temperature T0≈46K in the range 78–300K.
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Bewley et al. (2004) studied this question.
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