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16 May 2007 Adaptive optics system to accurately measure highly aberrated wavefronts
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Abstract
Due to the improvements in design and manufacturing technologies, new lenses with complex shapes are continuously appearing in the market. The fabrication of free-form lenses depends mainly on the possibility of measurement. A sensor with simultaneously a large dynamic range and good resolution becomes essential to be able to produce complexshaped lenses with high quality. Regarding this purpose, we propose an adaptive optics (AO) system to measure with a good resolution lenses that have a complex shape. The AO system consists in a novel Shack-Hartmann wavefront sensor based on a cylindrical microlens array, and a liquid crystal programmable phase modulator (PPM) as an active device within an open-loop configuration. The original wavefront from the lens to test is compensated with the PPM in order to decrease its complexity. Subsequently, the compensated wavefront can be measured by the sensor with good accuracy. The wavefront generation performance of the PPM was analyzed in order to evaluate its suitability for open-loop compensation, and a very good correlation between the theoretical wavefront written on the PPM and the measured wavefronts has been obtained for the different amounts of aberration studied. To validate the working principle of the complete setup, an spherical ophthalmic lens with a strong curvature that exceeds the dynamic range of the sensor was successfully measured.
© (2007) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
M. Ares and S. Royo "Adaptive optics system to accurately measure highly aberrated wavefronts", Proc. SPIE 6584, Adaptive Optics for Laser Systems and Other Applications, 65840F (16 May 2007); https://doi.org/10.1117/12.723647
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