Patent ID: 6668001
Filing Date: 2003-12-23
Classification: H01S

Abstract:
A semiconductor laser device comprising:a semiconductor substrate; a resonator structure including a first facet having a reflective coating, a second facet having an antireflective coating, and a propagation direction which extends from the first facet to the second facet; and an active region configured to generate light and including a linear section extending from the first facet along the propagation direction of the resonator structure and having a width â€œdâ€  which is substantially uniform along the propagation direction, and a flared section extending from the linear section toward the second facet, the flared section having a tapered width increasing toward the second facet, wherein the relation of tanâˆ’1 {(&Dgr;W/2)/L}<0.25Â° holds, in which â€œLâ€  is a length of the flared section in the propagation direction of the resonator structure, and &Dgr;W is a difference between a width (W2) of the flared section at the second facet and a width (W1) of the linear section.