A frequency-doubled, edge-emitting semiconductor laser includes a separate
confinement heterostructure surmounted by a waveguide including a
converting layer of a periodically poled, optically nonlinear material.
Fundamental radiation generated in the heterostructure is directionally
coupled from the heterostructure into the waveguide, is converted to
second-harmonic radiation in the converting layer and is delivered from
the waveguide as output radiation. In one example, a distributed Bragg
grating is included at an interface between the heterostructure and the
waveguide for facilitating coupling of fundamental radiation from the
heterostructure into the waveguide.