Coherent beam superposition of ten diode lasers with a Dammann grating

David Pabœuf (1) , Florian Emaury (1) , Sébastien de Rossi (2) , Raymond Mercier (2) , Gaëlle Lucas-Leclin (1) , Patrick Georges (1)

1 Laboratoire Charles Fabry de l'Institut d'Optique / Elsa
2 Laboratoire Charles Fabry de l'Institut d'Optique / Scop

We demonstrate the use of a binary diffractive optical element in a very simple setup to convert the multi- lobed 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.

Domaines: Optique [physics.optics]

David Pabœuf, Florian Emaury, Sébastien de Rossi, Raymond Mercier, Gaëlle Lucas-Leclin, et al.. Coherent beam superposition of ten diode lasers with a Dammann grating. Optics Letters, 2010, 35 (10), pp.1515-1517. ⟨hal-00533598⟩