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Coherent beam superposition of ten diode lasers with a Dammann grating

Paboeuf, David and Emaury, Florian and de Rossi, Sébastien and Mercier, Raymond and Lucas-Leclin, Gaëlle and Georges, Patrick (2010) Coherent beam superposition of ten diode lasers with a Dammann grating. Optics Letters, 35 (10). pp. 1515-1517. ISSN 0146-9592

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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.