Room-temperature 3.73 µm GaSb-based type-I quantum-well lasers with quinternary barriers

Room-temperature operation of GaSb-based type-I lasers with emission wavelength of 3.73 ?m is reported for the first time. Ridge-waveguide devices with five quantum wells and quinternary barriers for improved hole confinement lase in pulsed operation with a low transparency threshold current density of 676 A cm?2?for infinite stripe width. The presence of additional loss mechanism is observed above 20 ?C, changing the characteristic temperature from 38 K to 16 K and limiting the maximum operating temperature to 32 ?C.