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Interferometric test setup for lens alignment
![Fig. 8. Interferometric test setup for lens alignment (sketch and pictures)](/6873143/original-1517424336.jpg?t=eyJ3aWR0aCI6MjQ2LCJvYmpfaWQiOjY4NzMxNDN9--c8a2e756d4db5e9e33c1e63d43b34ed41a2c0e32)
Fig. 8. Interferometric test setup for lens alignment (sketch and pictures)
For various measurement and adjustment tasks, computer-generated holograms (CGHs) with several zones (MZ-CGHs) are used. These are diffractive optical elements with the ability to form almost arbitrarily shaped wave fronts. The figure shows a setup for a measurement systems analysis of the applied CGHs. For example, the straightness of the axis, defined by the series of spots, is verified with an accuracy in the sub-micron region, which is essential for the lens adjustment.
![Fig. 9. Alignment of the scaled lens L2](/6873153/original-1517424336.jpg?t=eyJ3aWR0aCI6MjQ2LCJvYmpfaWQiOjY4NzMxNTN9--9e2b2df2aeb700eb40990eb9c63f489d792df3ab)
Fig. 9. Alignment of the scaled lens L2