Patent ID: 7388894

Claim:
A waveguide to waveguide coupled hybrid master oscillator power amplifier (MOPA), comprising: a wavelength locked laser master oscillator (MO) first chip comprising a semiconductor substrate including a waveguide region having a gain section, one side of said MO including an integrated wavelength selective feedback element and the other side of said MO including an integrated reflective or coupling element on one side said waveguide and an emitting surface opposite said integrated reflective or coupling element for emitting light; a power amplifier (PA) second chip stacked above or below said MO comprising a semiconductor substrate including a waveguide region having a gain section, said PA including an integrated reflective or coupling element on a side of said PA aligned with light emitted from said emitting surface and a coupling grating or turning mirror and integrated lens on an opposite side of said PA for emitting an output beam.