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Functional testing of varifocals

A wavefront sensor with enhanced measurement range based on application of micro-mirror arrays
: Stürwald, S.

Optik & Photonik 9 (2014), No.2, pp.38-40
ISSN: 1863-1460
Journal Article
Fraunhofer IPT ()

For functional testing of optical systems, typically Shack-Hartmann-based sensors consisting of a combination of a micro lens matrix and a CCD/CMOS sensor are utilized. Their lateral resolution is restricted to the size of the micro-lenses, and the maximum measurable wavefront slope is usually significantly limited to avoid ambiguous signals on the detector. Here, we present a similar measurement method which is, however, based on a digital micro-mirror matrix for selecting subapertures in reflection. This leads to enhanced measurement capabilities in functional testing of optics.