| Shack-Hartmann wavefront sensor test of a flat mirror |
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Setup:
The Ritchey-Common configuration is used for testing a flat mirror, in conjunction with a spherical mirror.
First the SH frame of the spherical mirror is obtained directly: this becomes the calibration frame. Then the SH frame of the flat + spherical
mirror is obtained, using the configuration shown above. Then the analysis proceeds in the usual way, thus giving the optical quality of the
flat mirror alone.
Clearly, since the aberrations of the spherical mirror are removed by the calibration process, it does not need to be of a very high quality.
In the above configuration, the spherical mirror has been placed at an angle of 90 degrees. Other angles can be also used.
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| Lenses |
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| Mirrors |
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 flat mirror |
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Ophthalmic lenses |
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| Human eye |
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| Astronomical Telescopes |
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