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Proceedings Paper

Passive coherent beam combining of quantum-cascade lasers with a Dammann 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 ~ 0.65 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.

Paper Details

Date Published: 8 February 2012
PDF: 6 pages
Proc. SPIE 8277, Novel In-Plane Semiconductor Lasers XI, 82771U (8 February 2012); doi: 10.1117/12.906717
Show Author Affiliations
Guillaume Bloom, Thales Research and Technology (France)
Christian Larat, Thales Research and Technology (France)
Eric Lallier, Thales Research and Technology (France)
Gaëlle Lehoucq, Thales Research and Technology (France)
Shailendra Bansropun, Thales Research and Technology (France)
Mane-Si Laure Lee-Bouhours, Thales Research and Technology (France)
Brigitte Loiseaux, Thales Research and 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. 8277:
Novel In-Plane Semiconductor Lasers XI
Alexey A. Belyanin; Peter M. Smowton, Editor(s)

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