Coherent combining of quantum-cascade lasers with a binary phase 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:10.1117/12.902136

5 October 2011 Coherent combining of quantum-cascade lasers with a binary phase 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 8187, Technologies for Optical Countermeasures VIII; 81870D (2011) https://doi.org/10.1117/12.902136
Event: SPIE Security + Defence, 2011, Prague, Czech Republic

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, and 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); https://doi.org/10.1117/12.902136

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