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Proceedings Paper

Large dynamic range wavefront sensor based on a cylindrical microlens array
Author(s): M. Ares; S. Royo
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Paper Abstract

The trade-off between resolution and dynamic range must be managed in the design of a Shack-Hartmann wavefront sensor (SHWS). A relatively large f-number of the microlenses should be chosen to get good lateral and vertical resolutions, but the corresponding dynamic range of measurement is degraded. To extend the dynamic range while keeping a good resolution, we propose a novel SHWS based on a cylindrical microlens array. Instead of the conventional spot pattern, two orthogonal line patterns with the microcylinders oriented in the horizontal and vertical directions are detected on a conventional CCD array. Because the sampled data are now connected along continuous lines, a self-developed line-tracking algorithm unequivocally localizes them even if they are highly distorted. With the sensor constructed, a wavefront transmitted by a commercial progressive addition lens with more than 80&lgr; peak-to-valley height has been succesfully measured. The vertical resolution of the sensor was also calculated, resulting of &lgr;/25 at the wavelength used (&lgr;=635 nm).

Paper Details

Date Published: 16 May 2007
PDF: 9 pages
Proc. SPIE 6585, Optical Sensing Technology and Applications, 658529 (16 May 2007); doi: 10.1117/12.723644
Show Author Affiliations
M. Ares, Technical Univ. of Catalunya (Spain)
S. Royo, Technical Univ. of Catalunya (Spain)

Published in SPIE Proceedings Vol. 6585:
Optical Sensing Technology and Applications
Francesco Baldini; Jiri Homola; Robert A. Lieberman; Miroslav Miler, Editor(s)

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