Physics
Scientific paper
Aug 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005spie.5899..286a&link_type=abstract
UV/Optical/IR Space Telescopes: Innovative Technologies and Concepts II. Edited by MacEwen, Howard A. Proceedings of the SPI
Physics
Scientific paper
The creation of next generation, ultra-large space telescopes (>20m diameter) will require novel technologies. Many current concepts involve curved membrane reflectors but the problem is creating a diffraction-limited, three-dimensional surface. Here we present the idea of using a flat diffractive element which requires no out-of-plane deformation and is thus much simpler to deploy. The primary is a photon sieve--a diffractive element consisting of a large number of precisely positioned holes distributed over a flat surface. Photon sieves can be simply designed to any conic, apodization and operating bandwidth. The photon sieve is easier to fabricate than the better known Fresnel zone plate as a single substrate can be used since there are no connected regions requiring support. Presented here are results of prototypes capable of diffraction-limited imaging over wide fields and useful bandwidths.
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