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Chapter 8: Optino/Puntino test configurations
8.9 Test of flat mirror: double pass
Optino
Beamsplitter
DSH
Test flat mirror
To SH
system
Dinput
C1
Flat mirror
Light source with
pinhole
Setup
In the above configuration, light is made parallel by the collimating lens C1, and passes through the
beam-splitter. It then illuminates the Test flat mirror, is reflected to the (reference) flat mirror, and
then back into Optino.
Instrument
Optino.
Beam expander
A beam expander can be used to expand (or compress) the size of the output beam.
Calibration
The aberrations of the SH system itself are removed taking a calibration image of a high quality flat
reference mirror instead of the test mirror. This determines the accuracy of the test.
Input Values for wavefront analysis
Dinput (input diameter of beam from Optino), Dtest (diameter of test element), M (magnification or
compression factor of beam expander, if used).
Output information
Sensoft gives the Zernike coefficient, the wavefront and optical quality of the flat mirror.
Single or double pass
Double pass.
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