Abstract

Multilevel phase holograms for monochromatic radiation at a wavelength of 10.6 μm are recorded as surface relief gratings with multilevel discrete binary steps. Our experiments show that diffraction efficiencies close to 90% can be achieved both for transmissive and reflective elements. The reduction of efficiency due to errors in the depth and the width of the step levels is considered.

© 1991 Optical Society of America

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