This video shows several types of micro-lenses that I made using a DIY maskless wafer stepper. The tiny lenses can for example be used for building a Shack-Hartmann wavefront detector.

Explanation of the Shack-Hartmann principle can be found on Wikipedia:
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This is the download link for Windows installer for the Zone Plate app:

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YouTube does not like to redirect to this link. the file is (last part of the URL): /assets/zp_writer.zip

For Windows 10 and for personal use only. Virus scanners and Windows will nag about it being a rare / unknown file and make installation sometimes difficult. Sorry about that. Install this app at your own risk.

Link to the maskless wafer stepper playlist:
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Applied science video on photolithography:
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Reference for article on zone plate design:
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Wikipedia also explains this very clearly, but I just found this article first.

Links to some commercially available Shack-Hartmann detectors:
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@ 0.34m: four happy seconds with Deodato, listen to the full song at:
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