Patent ID: 8995482
Filing Date: 2015-03-31
Classification: H01S

Abstract:
1. A semiconductor laser comprising: a master oscillator configured to emit a first stage laser beam, an optical amplifier configured to receive and add optical power to the first stage laser beam producing a second stage beam, a plurality of ring resonators, each configured as a regenerative amplifier to receive a portion of the second stage laser beam along a first direction, add optical power to the portion of the second stage laser beam, and emit a third stage laser beam along a second direction, wherein the second stage laser beam and the third stage laser beam have substantially identical wavelengths and phase, each ring resonator comprising a gain region of at least one semiconductor laser diode, a semireflective mirror configured to receive an input beam along the first direction and emit an output beam along the second direction, a plurality of reflecting mirrors wherein each gain medium is disposed between two of the reflecting mirrors, wherein the semireflective mirror and reflective mirror form a circulating optical path which passes through at least one gain medium, and a beam combiner configured to receive and coherently combine into a single monochromatic laser beam at least two of the third stage laser beams.