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.
- diffractive optical element
- multilobed beam
- laser diodes
- quasi-Gaussian beam
Paboeuf, D., Emaury, F., de Rossi, S., Mercier, R., Lucas-Leclin, G., & Georges, P. (2010). Coherent beam superposition of ten diode lasers with a Dammann grating. Optics Letters, 35(10), 1515-1517. https://doi.org/10.1364/OL.35.001515