Microlens arrays for Shack-Hartmann wavefront sensors

Details Microlens arrays for Shack-Hartmann wavefront sensors Microlens arrays for Shack-Hartmann wavefront sensors

Jun 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992opten..31.1311a&link_type=abstract

Optical Engineering (ISSN 0091-3286), vol. 31, no. 6, June 1992, p. 1311-1322.

Astronomy and Astrophysics

Astronomy

9

Diffraction Limited Cameras, Gravitational Lenses, Wave Fronts, Atmospheric Turbulence, Calibrating, Gratings (Spectra), Seeing (Astronomy), Telescopes

Scientific paper

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.

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