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Optical Engineering

Microlens arrays for Shack-Hartmann wavefront sensors
Author(s): Guy Edouard Artzner
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Paper Abstract

Microlens arrays are a component of atmospheric wavefront sensors used recently with success by ground-based astronomers to obtain diffraction-limited images of stars in spite of wavefront disturbances introduced by the earth's atmosphere. Typical requirements for individual lenses are a size measured in tenths of millimeters, a sag measured in micrometers, and no room left between lenses, i.e., square or hexagonal lenses rather than circular lenses. Actual monolithic square microlens arrays up to 20 x 20 mm in size for 0.18- to 1.5-mm individual contiguous lenses of 0.0035-mm maximum sag are engraved in photoresist coatings by a two-axes rastering process. These arrays have been used for diurnal and nocturnal atmospheric wavefront measurements.

Paper Details

Date Published: 1 June 1992
PDF: 12 pages
Opt. Eng. 31(6) doi: 10.1117/12.56178
Published in: Optical Engineering Volume 31, Issue 6
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