Hacker News Reader

optical stages and alignment, sending beams of light to specific locations.

Optical suppliers are

https://www.edmundoptics.com/ (highly recommend ordering their catalog)

Youtube channels on optics

Man, Edmund Scientific is a throwback. They used to have an awesome surplus store in NJ full of all kinds of nerd stuff.

They are still around as

https://www.scientificsonline.com/ (Edmund's Scientific) though it is mostly k-8 science toys.

https://www.surplusgizmos.com/ (Intel and Portland electronics surplus)