title: Coherent beam superposition of ten diode lasers with a Dammann grating.
abstract: We demonstrate the use of a binary diffractive optical element in a very simple setup to convert the multilobed beam from a low fill factor array of coherent laser diodes into a quasi-Gaussian beam. The phase profile of the grating is determined with a phase retrieval algorithm. Experimentally, the conversion efficiency reaches more than 44%. We also establish that this setup can be used to make an effective measurement of the coherency of the laser array.
authors.affiliation: Laboratoire Charles Fabry de l'Institut d'Optique, CNRS, Université Paris-Sud,Campus Polytechnique--RD128--91127 Palaiseau Cedex, France.
authors.forename: David
authors.initials: D
authors.lastname: Paboeuf
authors.forename: Florian
authors.initials: F
authors.lastname: Emaury
authors.forename: Sébastien
authors.initials: S
authors.lastname: de Rossi
authors.forename: Raymond
authors.initials: R
authors.lastname: Mercier
authors.forename: Gaëlle
authors.initials: G
authors.lastname: Lucas-Leclin
authors.forename: Patrick
authors.initials: P
authors.lastname: Georges