This video is a follow-up from the video on spherical radius grinding. In this video I explain briefly the grinding process (using sIlicon carbide, SiC) and polishing process (using Cerium oxide, CeO and optical pitch. If you want to know more about the properties of optical pitch, this video is entertaining:

   • We’ve Watched This Droplet For 91 Yea...  

The surface is inspected using a simple Foucault tester made of a smart phone and a razor blade. More information on the Foucault test can be found at:

https://en.wikipedia.org/wiki/Foucaul...
or
https://stellafane.org/tm/atm/test/un...

A very good book on optical manufacturing techniques is "Fabrication Methods for Precision Optics" by Hank H. Karow. A good book on optical testing is " Optical Shop Testing" by Daniel Malacara.

Gordon Waite has a great series of video's on polishing and grinding of large telescope mirrors:    / gordonwaite  

It is now possible to contribute financially to the Huygens Optics Youtube channel. Please refer to the "About"-page of the channel for details.