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Passive coherent beam combining of quantum-cascade lasers with a Dammann grating

Abstract : An external cavity using a binary phase grating has been developed to achieve coherent combining of five quantum-cascade lasers emitting at 4.65 μm. 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 ~ 0.5 W with a good beam quality (M² < 1.6)
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Submitted on : Tuesday, March 27, 2012 - 2:23:45 PM
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Guillaume Bloom, Christian Larat, Eric Lallier, Gaëlle Lehoucq, S. Bansropun, et al.. Passive coherent beam combining of quantum-cascade lasers with a Dammann grating. Optics Letters, Optical Society of America, 2011, 36 (19), pp.3810-3812. ⟨hal-00625622⟩

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