Making a Mirror with a Variable Surface Shape
Huygens Optics
@huygensopticsAbout
Hi, my name is Jeroen and on the Huygens Optics channel I publish videos on personal projects. My main fields of interest are optics, mechanics and photolithography. The videos aren't targeted towards a general audience but for people with a passion for science and technology (e.g. my fellow nerds). The channel is named after the famous Dutch mathematician, astronomer and inventor Christiaan Huygens (1629-1695). He was the first to publish a mathematical description of the wave properties of light, and also discovered Saturn's rings. I make these videos for fun, without a financial motivation. Please don't contact me for sponsoring contracts or in-video advertisement. Neither me nor my viewers are interested. If you want to contribute as a viewer, you can do so by either donating using the Paypal link or by using the Patreon account: https://www.patreon.com/huygens_optics Your donation helps me to make better videos.
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Video Description
Some concepts in this video have been pictured in a somewhat simplified manner to make it more accessible to a less specialized audience. Contents: 00:00 General intro 00:56 Conic constant explained 10:00 Explanation of the manufacturing process 12:25 Testing the mirror 15:32 interferometric evaluation using DFTfringe Additional info on clips/subjects featured in this video (in the order of appearance): The fire clips were taken from the news site regio14.nl: https://www.youtube.com/watch?v=Xwjank7ZM_0 The short clip of (Ralph) grinding a telescope mirror is taken from: https://www.youtube.com/watch?v=QbJIFQ-o4Nw The "mirror test" for animals actually has little to do with optics: https://en.wikipedia.org/wiki/Mirror_test#Animals_that_have_passed If you want a more detailed story on conics: https://www.telescope-optics.net/conics_and_aberrations.htm. Telescope-optics.net is a great source for theory on optics. Clip of making the ellipse using a rope demonstrating constant path length is taken from the following video: https://www.youtube.com/watch?v=0maahsJQOJE Astroforum link to 610mm flex mirror by forum user Firstlight (in Dutch): https://www.astroforum.nl/forum/instrumenten/zelfbouw-atm/1398665-61cm-flex-mijlpaaltje Document with a description of how to making a "Ceravolo" type interferometer yourslf: http://www.ceravolo.com/Interferometry.pdf Links to DFTfringe software: interferometry groups: https://groups.io/g/Interferometry. In this community Dale Eason answers all the questions on technical subjects about the software. Download the latest version of DFTfringe here: https://github.com/githubdoe/DFTFringe/releases DFTfringe walk through, displaying most of the basic functionality: https://www.youtube.com/watch?v=LU8PQGzEpQs With the interferometric tests I considered astigmatism in the mirror and only left the following zernike coefficients unticked: Piston X-tilt, Ytilt, Defocus, Xcoma, Ycoma.
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