Patent ID: 6075801
Filing Date: 2000-06-13
Classification: H01S,Y10S

Abstract:
A semiconductor laser comprising a first conductivity type buffer layer and an active layer, said active layer being formed of one of two structures, one of said two structures being a multi-quantum well structure and the other of said two structures sandwiched by SCH layers being a multi-quantum well structure and a second conductivity type cladding layer, said active layer and said second conductivity type cladding layer being sequentially positioned on a first conductivity type semiconductor substrate, at least said active layer and said second conductivity type cladding layer being in a tapered ridge shape such that a width of said active layer is defined by said ridge shape, said width of said active layer varying linearly along a resonating direction, said tapered ridge shape defining a laser gain region comprising:a relatively high reflection film provided on a facet of a relatively wide side of said laser gain region of the active layer; anda relatively low reflection film provided on a facet of a relatively narrow side of said laser gain region of the active layer, said facet of the narrow side being for outputting oscillation beams of a high-order mode.