Beamsplitters & Fold Mirror

The AR coating on these beamsplitters is noticeably better than the cheap ones I used before; my interferometer fringes are finally crisp and stable. Setup was straightforward with the fold mirror aligning perfectly on the first try.

The split ratio held steady across my entire alignment process, which saved me a lot of tweaking. Even after hours of use, the beam quality didn't degrade at all.

Routed a 532 nm beam through the fold mirror and the alignment held rock-solid over a two-hour interferometry run; the clear aperture on this unit is genuinely generous. Exactly the kind of repeatable, drift-free performance you need when the fringes start moving.