Abstract
The demand for space-borne telescopes with an aperture of 20 m is
forcing the development of large diameter diffractive Fresnel zone lenses
(FZLs) on membranes. However, due to the fabrication errors of multi-level
microstructures, the real diffraction efficiency is always significantly
smaller than the theoretical value. In this Letter, the effects of a set
of fabrication errors on the diffraction efficiency for a diffractive
membrane are studied. In order to verify the proposed models, a 4-level
membrane FZL with a diameter of 320 mm is fabricated. The fabrication
errors of the membrane FZL are measured, and its diffraction efficiency in
the +1 order is also tested. The results show that the tested diffraction
efficiency is very close to the calculated value based on the proposed
models. It is expected that the present work could play a theoretical
guiding role in the future development of space-borne diffractive
telescopes.
© 2016 Chinese Laser Press
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