Calibrating the wavefront sensor for the 6.5 m MMT with a phase-shifting interferometer

Details Calibrating the wavefront sensor for the 6.5 m MMT with a phase-shifting interferometer Calibrating the wavefront sensor for the 6.5 m MMT with a phase-shifting interferometer

Feb 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003spie.4839..206j&link_type=abstract

Adaptive Optical System Technologies II. Edited by Wizinowich, Peter L.; Bonaccini, Domenico. Proceedings of the SPIE, Volume 4

Physics

Scientific paper

In an adaptive optical system,it is essential that the wavefront sensor be accurately calibrated and aligned to the wavefront corrector. For the case of the Shack-Hartmann sensor, there are at least three quantities which must be measured: (a) the response of the subapertures to local wavefront tilt, (b) the location of the zero-point for each subaperture from a plane wave input, and (c) the spatial relationship between the wavefront sensor subapertures and the wavefront corrector actuators. This paper present a method which verifies the calibration of a Shack-Hartmann wavefront sensor by simultaneously measuring static wavefront with a phase-shifting interferometer. These measurements were made using an apparatus we constructed in the laboratory to build and test the adaptive optical ystem for the 6.5 m MMT.

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