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Abstract
Room-temperature operation of GaSb-based type-I lasers with emission wavelength of 3.73 µm 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.
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