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Highly efficient phase locking and extracavity coherent combination of two diode-pumped Nd:YAG laser beams

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Abstract

Intracavity phase locking and extracavity combination of the two emitted beams generated by a Nd:YAG laser longitudinally pumped by two fiber-coupled diode lasers are investigated. Phase locking is performed by a diffractive component located inside a confocal Fabry–Perot resonator. The coherent addition of the two synchronized beams in a single TEM00 wave is made by a birefringent interferometer, with 96.8% energy yield. 610-mW output power was obtained in a single-lobed beam profile with 30.5% optical-to-optical conversion efficiency in the continuous-wave regime.

© 1996 Optical Society of America

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