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

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

doi:10.1117/12.906717

8 February 2012 Passive coherent beam combining of quantum-cascade lasers with a Dammann grating

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

Author Affiliations +

Proceedings Volume 8277, Novel In-Plane Semiconductor Lasers XI; 82771U (2012) https://doi.org/10.1117/12.906717
Event: SPIE OPTO, 2012, San Francisco, California, United States

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 ~ 0.65 W corresponding to a combining efficiency of 70% 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, and Patrick Georges "Passive coherent beam combining of quantum-cascade lasers with a Dammann grating", Proc. SPIE 8277, Novel In-Plane Semiconductor Lasers XI, 82771U (8 February 2012); https://doi.org/10.1117/12.906717

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