Making Tiny Fresnel Lenses during a Pandemic @HuygensOptics

Huygens Optics | Making Tiny Fresnel Lenses during a Pandemic @HuygensOptics | Uploaded April 2020 | Updated October 2024, 3 hours ago.
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:
en.wikipedia.org/wiki/Shack%E2%80%93Hartmann_wavefront_sensor

This is the download link for Windows installer for the Zone Plate app:

huygensoptics.com/assets/zp_writer.zip

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:
youtube.com/playlist?list=PLaLGh7vzNIRRuvbxZKHOUaeosIO4hpcsw

Applied science video on photolithography:
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:
thorlabs.com/newgrouppage9.cfm?objectgroup_id=5287
optocraft.de/products-shslab

@ 0.34m: four happy seconds with Deodato, listen to the full song at:
youtube.com/watch?v=l79248iHjwI

$Ray/Wave Racing Championships 2023 #light #physics This wave / lens simulation was made using the Python wave simulation script provided by @DiffractionLimited. The link to the source code on github can be found in the description of this particular video: https://www.youtube.com/watch?v=N5a06o3ghzU$

Camera Mirror Lenses Part 1: Visual and Interferometric Testing

$About Laser Speckle The video shows a simulation of a phenomenon called speckle. Its best known as the granular interference pattern observed if we shine a coherent light of a laser at a diffuser. You can also observe it from a medium that contains small scattering particles. The simulation shows that it is caused by small phase differences that are introduced in the light by non-uniformity of a medium The green laser speckle image is taken from Wikipedia (copyrights Steve Jurvetson) and shown here under the Creative Commons license 2.0 (https://creativecommons.org/licenses/by/2.0/) Simulations made using the Python code suplied by @DiffractionLimited #physics #light$ $Exploring White Light Interferometry! (WLI / CSI) Creating 3D-maps of reflective surfaces using White Light Interferometry (WLI, also known as Coherence Scanning interferometry). Content: 0:00 Intro 1:43 Building a White Light Interferometer 4:39 About spatial coherence 7:11 Observing interference in white light 10:37 Broad-band radiation interference explained in detail 21:11 WLI Microscope Zygo Newview 100 explored 23:16 Measurement examples 25:44 Michelson and Mireau objectives 26:56 Concave spherical mirror surface (measurement) 27:44 Granite surface structure (measurement) 28:47 Etched glass surface (measurement) 29:32 Turned stainless vacuum part surface roughness (measurement) The simulations starting from 5:12 have been made using the python script produced by @DiffractionLimited. This code can be downloaded from https://github.com/0x23/WaveSimulator2D$

Analog TV Equipment: R&S SFM test transmitter and CCVS video generator.