Making a Fizeau Interferometer

This video is about making a Fizeau interferometer using a DPSS green laser similar to my Zygo GH. I used parts I've collected but the optics aren't all that expensive.

[@vizionthing]

Thank you Ed, always a pleasure when you upload.

[@russedmonds227]

Great video, I have noticed with my simple Michelson interferometer that fringe contrast varies with time for a DPSS green laser diode. Have you seen this ?

[@Opticsed]

I haven't seen it but can't say for sure. The worst I've seen is in warm up but fringes were still always visible.

[@russedmonds227]

@@Opticsed ok thanks. This probably varies with different laser diodes.

[@matthewbrown8679]

Thank you for the video.
Where can I get, or learn how to make a spherical reference?

[@haozheng6097]

Thank you Ed, was wondering if you have tested its performance? and compared with Zygo