SUB-LENS SPATIAL RESOLUTION SHACK-HARTMANN WAVEFRONT SENSING

摘要

Traditionally the spatial resolution of Shack-Hartmann wavefront sensing has been limited by the size of the lenses used in the array. To see features smaller than a lens diameter the wavefront had to be magnified before entering the sensor with a lens or set of lenses. The disadvantage of this technique is that the magnifying lenses then impose their own aberrations and the field of view of the wavefront sensor is reduced. We present a technique for increasing spatial resolution using the hard aperture of the lens to limit the wavefront area being sensed. Diffraction modeling and experimental results using this technique are presented.