Room-temperature “W” diode lasers emitting at λ≈4.0μm

Abstract
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 145Acm2 and slope efficiency of 47mWA per facet at 78K , and displayed a characteristic temperature T046K in the range 78300K .