Making Tiny Fresnel Lenses during a Pandemic

Video Description

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: https://en.wikipedia.org/wiki/Shack%E2%80%93Hartmann_wavefront_sensor This is the download link for Windows installer for the Zone Plate app: http://www.huygensoptics.com/assets/zp_writer.zip YouTube does not like to redirect to this link. the file is (last part of the URL): huygensoptics.com/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: https://www.youtube.com/playlist?list=PLaLGh7vzNIRRuvbxZKHOUaeosIO4hpcsw Applied science video on photolithography: https://www.youtube.com/watch?v=YAPt_DcWAvw Reference for article on zone plate design: https://laser.physics.sunysb.edu/_pradyoth/Intel/Creating_dark_lines_in_space.pdf Wikipedia also explains this very clearly, but I just found this article first. Links to some commercially available Shack-Hartmann detectors: https://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=5287 https://www.optocraft.de/products-shslab/ @ 0.34m: four happy seconds with Deodato, listen to the full song at: https://www.youtube.com/watch?v=l79248iHjwI