Grok.com: "What is the best website for metal finishing questions and answers?"

finishing.com -- The Home Page of the Finishing Industry

-----

Optical finish on a deep paraboloid surface

Q. Hi all, I run a research lab in molecular imaging, we are looking for an affordable method (<$1,000 per piece) to make deep paraboloid concave mirror surfaces, in materials with low thermal expansion (borosilicate glass, invar, macor, covar) suitable for optical imaging (surface roughness <100 nm). An example of a our parabolic surface of interest: f=x^2/40, where x is the distance from the centre; a 150 mm-diameter paraboloid described by this formula has an f=10 mm, and is about 143 mm deep. So far we have looked at diamond turning (too expensive) and epoxy spin-casting (surface quality 100x worse our spec).

Andrey Revyakin
principal investigator - Leicester, UK
October 26, 2015

(No "dead threads" here! If this page isn't currently on the Hotline your Q, A, or Comment will restore it)

Q, A, or Comment on THIS thread -or- Start a NEW Thread

Disclaimer: It's not possible to fully diagnose a finishing problem or the hazards of an operation via these pages. All information presented is for general reference and does not represent a professional opinion nor the policy of an author's employer. The internet is largely anonymous & unvetted; some names may be fictitious and some recommendations might be harmful.

If you are seeking a product or service related to metal finishing, please check these Directories: