Patent ID: 6160829
Filing Date: 2000-12-12
Classification: B82Y,H01S

Abstract:
A semiconductor laser device comprising a first conductivity-type semiconductor substrate, and a first conductivity-type cladding layer, active layer and a second conductivity-type cladding layer consecutively formed on said semiconductor substrate, at least one of said first conductivity-type cladding layer and said second conductivity-type cladding layer including therein a saturable absorbing layer having first and second surfaces, a first buffer layer disposed in contact with said first surface of said saturable absorbing layer, and first and second cladding layer portions sandwiching therebetween said saturable absorbing layer and said first buffer layer, a semiconductor material for said saturable absorbing layer having a first bandgap energy which is lower than a second bandgap energy of a semiconductor material for said first and second cladding layer portions, a semiconductor material for said first buffer layer having an intermediate valence band energy between first valence band energy and second valence band energy.