نوافذ تجارية مربعة من السيليكا المنصهرة من الدرجة S1-UV

The parallelism spec (<10') made alignment dead simple for my optical setup, no shimming needed. Edges were clean too, which saved me from having to rework anything before mounting.

Surface quality is what sold me — no scratches or digs anywhere near the 60-40 spec, and the edges came clean and unchipped. Both squares mic'd within a hair of the stated diameter too, so I didn't have to shim anything in my mount.

I was worried about thickness consistency for my UV setup, but these came in right at +/- 0.125 mm and mated perfectly with my existing mounts. Parallelism under 10 arcminutes is way tighter than the last batch I bought elsewhere.