US 5,499,262 A · Semiconductor laser light source unit

Abstract

A rod lens or a cylindrical lens is disposed in front of a semiconductor laser to increase a divergence angle of a laser beam emitted from the semiconductor laser so as to form a substantially circular far field pattern. In another constitution, there is disposed in front of a semiconductor laser a composite lens having two cylindrical surfaces whose cylindrical axes are perpendicular to each other. The cylindrical surface on the side of the semiconductor laser is a convex surface and the other cylindrical surface is a convex or concave surface. In still another constitution, two semiconductor lasers emitting the same optical signal are arranged adjacent each other so that respective light emitting portions of two pn junction planes are located in the same plane and perpendicular to each other, and that laser beams form orthogonal spots at a single predetermined position.

Claims19

Dependent claims

A semiconductor laser light source unit comprising:

a semiconductor laser for emitting a laser beam having an elliptical sectional shape;
and
optical means having orthogonal axes of different curvature with the axis of greater curvature being disposed parallel to the major axis of the elliptical sectional shape for increasing a divergence angle of the laser beam in a direction parallel with a minor-axis of the elliptical sectional shape so as to produce a substantially circular far field pattern of the laser beam.

Dependencies are inferred from the claim text.

Semiconductor laser light source unit

Life of this patent

Semiconductor laser light source unit

Life of this patent

Abstract

Claims19