High Refractive Index Glass Hits 2.1 With 97% Transmittance, Raising Eyebrows for AR Optics
jwt0625 · x · 2026-10-24
jwt0625 shared an M100-series glass spec sheet with a astonished note: refractive index now reaches 2.1. The M200 grade offers n=2.10, Abbe number 18, while keeping ≥97% internal transmittance at 460nm, in 6/8/12-inch sizes, ≥0.3mm thick, with <0.5nm surface roughness and AR coating options.
Such high-index optical glass is typically destined for precision optics like AR waveguides — hitting this index-transmittance combination is a remarkable process feat.
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