Patent ID: 6996149
Filing Date: 2006-02-07
Classification: B82Y,H01S

Abstract:
1. A semiconductor laser device, comprising: an active layer having at least one quantum well structure and a width of larger than 1.8 μm; a plurality of optical confinement layers each having a graded-index-separate confinement heterostructure (GRIN-SCH structure) formed on upper and lower sides of the active layer to sandwich the active layer between the optical confinement layers; and a plurality of current blocking layers formed on both lateral sides of the active layer and the plurality of optical confinement layers so as to sandwich the active layer and the plurality of optical confinement layers between the current blocking layers, each of the current blocking layers being formed by at least InP, wherein a refractive index difference between an equivalent refractive index in a region including the active layer and an equivalent refractive index in a region including the current blocking layers, is not more than 0.02.