Schott RG830

The 3mm thickness is exactly what I needed for my optical setup, and the 830nm cutoff is sharp and clean. My spectrometer readings are noticeably more precise now.

I needed a 3mm thick filter for a laser cleanup project, and this RG830 cuts off everything below 830nm just as expected. The optical quality is clean with no visible scratches or defects right out of the box.

Snapped this into my filter holder for IR pass imaging and the cut-on is right where it should be around 830nm, blocking everything below cleanly. Solid 3mm glass with no visible striations or coating defects.