Patent ID: 6055255
Filing Date: 2000-04-25
Classification: H01S

Abstract:
A semiconductor laser device, comprising:a semiconductor substrate of a first conductivity type;a layered structure including at least a first cladding layer of the first conductivity type, an active layer, and a second cladding layer of a second conductivity type, the layered structure being provided on the semiconductor substrate;a current blocking structure, having a striped concave portion therein, formed on the layered structure; anda third cladding layer of the second conductivity type provided so as to cover the striped concave portion and the current blocking structure,wherein the current blocking structure includes at least a saturable absorbing layer having a forbidden band width which is substantially equal to a forbidden band width of the active layer,wherein a forbidden band width of a portion of the current blocking structure other than the saturable absorbing layer is greater than the forbidden band width of the first and second cladding layers so as not to absorb a laser beam generated at the active layer.