Efficient, continuous-wave lasing operation of narrow-stripe, oxide-confine
d, long-wavelength InAs quantum dot lasers in the ground state (lambda simi
lar or equal to 1.28 mu m) has been achieved at temperatures up to 100 degr
ees C. The lasers have a very low threshold current density (J(th) = 24 A/m
(2)), high differential quantum efficiency (55), and very low internal loss
(alpha(i) = 0.77cm(-1)).