Etched pattern of a diffractive optical element for generation of a higher order Laguerre-Gauss laser beam.

From the article:

Higher-Order Laguerre-Gauss Mode Generation and Interferometry for Gravitational Wave Detectors
M. Granata, C. Buy, R. Ward, and M. Barsuglia
Phys. Rev. Lett. 105, 231102 (2010)

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