Abstract

An external cavity using a binary phase grating has been developed to achieve coherent combining of five quantum-cascade lasers emitting at 4.65μm. The grating phase profile is designed to combine five beams of equal intensities into a single beam with a good efficiency (75%). The performances of this cavity concerning output power, stability, combining efficiency and beam quality are detailed. We report a CW combining efficiency of 66% corresponding to an output power of 0.5W with a good beam quality (M2<1.6).

© 2011 Optical Society of America

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