5 October 2011 Coherent combining of quantum-cascade lasers with a binary phase grating
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Abstract
An external cavity with a binary phase grating has been developed to achieve the coherent beam addition of five quantum-cascade lasers emitting at 4.65 μm. The combining of these five emitters is achieved by a binary phase grating or Dammann grating able to separate an incident beam into five beams of equal intensities with a 75% efficiency. A CW output power of ~ 0.5 W corresponding to a combining efficiency of 66% with a good beam quality is obtained. More results concerning output power, combining, efficiency stability and beam quality and spectrum are exposed.
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Guillaume Bloom, Christian Larat, Eric Lallier, Gaëlle Lehoucq, Shailendra Bansropun, Mane-Si Laure Lee-Bouhours, Brigitte Loiseaux, Mathieu Carras, Xavier Marcadet, Gaëlle Lucas-Leclin, Patrick Georges, "Coherent combining of quantum-cascade lasers with a binary phase grating", Proc. SPIE 8187, Technologies for Optical Countermeasures VIII, 81870D (5 October 2011); doi: 10.1117/12.902136; https://doi.org/10.1117/12.902136
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