Wavefront correction system based on an equilateral triangular arrangement of actuators

Details Wavefront correction system based on an equilateral triangular arrangement of actuators Wavefront correction system based on an equilateral triangular arrangement of actuators

Aug 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993spie.1920...20s&link_type=abstract

Proc. SPIE Vol. 1920, p. 20-28, Active and Adaptive Optical Components and Systems II, Mark A. Ealey; Ed.

Physics

Optics

Scientific paper

We are developing an adaptive optics system that is based on an array of actuators arranged with subapertures that are equilateral triangles. The wavefront sensor is a video Hartmann sensor that also uses an equilateral array of lenslets. The controller hardware uses a VME bus. The design minimizes the generation of reflected wavefronts higher than first order across each lenslet for large excursions of actuators from positions where the mirror is flat and, thus maximizes the precision of the slopes measured by the Hartmann sensor. The design is also immune to the waffle mode that is present in the reconstructors of adaptive optics systems where actuators are arranged in a square array.

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