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Proceedings Paper

Coherent combining of quantum-cascade lasers with a binary phase grating
Author(s): 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
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Paper 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.

Paper Details

Date Published: 5 October 2011
PDF: 6 pages
Proc. SPIE 8187, Technologies for Optical Countermeasures VIII, 81870D (5 October 2011); doi: 10.1117/12.902136
Show Author Affiliations
Guillaume Bloom, Thales Research & Technology (France)
Christian Larat, Thales Research & Technology (France)
Eric Lallier, Thales Research & Technology (France)
Gaëlle Lehoucq, Thales Research & Technology (France)
Shailendra Bansropun, Thales Research & Technology (France)
Mane-Si Laure Lee-Bouhours, Thales Research & Technology (France)
Brigitte Loiseaux, Thales Research & Technology (France)
Mathieu Carras, Alcatel Thales III-V Lab. (France)
Xavier Marcadet, Alcatel Thales III-V Lab. (France)
Gaëlle Lucas-Leclin, Lab. Charles Fabry, CNRS, Univ. Paris-Sud (France)
Patrick Georges, Lab. Charles Fabry, CNRS, Univ. Paris-Sud (France)

Published in SPIE Proceedings Vol. 8187:
Technologies for Optical Countermeasures VIII
David H. Titterton; Mark A. Richardson, Editor(s)

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