Self-organised InAs quantum dots inserted in an (In, Ga)As matrix latt
ice matched to an InP substrate are used as an active region in an inj
ection laser. Low threshold (11.4A/cm(2)) lasing at 1.894 mu m (77K) v
ia the states of the quantum dots is obtained. A material gain of the
order of 10(4)cm(-1) is estimated.