Abstract

With the Shack-Hartmann Sensor (SHS) an optical wave-front is measured by sampling it with a microlens array. The lateral spot positions produced by each microlens are detected by a CCD-camera (Fig. 1) and are interpreted as a two-dimensional derivative field of the wave-front. By LSQ-fitting to the discrete derivative fields the wave-front can be reconstructed. Our SHS utilizes a refractive microlens array with a pitch of P=0.15mm and a focal length of f=4.5mm. A special algorithm for the attachment of the spots to their reference points allows for the measurement of strong spherical and non-spherical wave-front aberrations (Fig. 2a) [1]. The measured wave-front has an radius of curvature of about R=30mm, the peak-to-valley value of the shown field is about 130λ.

© 2000 IEEE