Coherent beam superposition of ten diode lasers with a Dammann grating.
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.
Paboeuf
David
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Laboratoire Charles Fabry de l'Institut d'Optique, CNRS, Université Paris-Sud,Campus Polytechnique--RD128--91127 Palaiseau Cedex, France.
Emaury
Florian
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de Rossi
Sébastien
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Mercier
Raymond
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Lucas-Leclin
Gaëlle
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Georges
Patrick
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