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An optical glass with an improved transmittance version of S-LAH99

We are pleased to announce the release of a new optical glass type named S-LAH99W, which has improved internal transmittance in the 360 – 550 nm range while maintaining the high refractive index (Nd 2.001), low specific gravity and excellent polishing characteristics of S-LAH99. This new industry-leading, high index, glass provides an exciting new choice for optical designers and is very well suited for use in applications such Augmented Reality waveguides and other devices.


  • Improved internal transmittance in the 360 – 550 nm range
  • Maintains the high refractive index (Nd 2.001)
  • Low specific gravity
  • Excellent polishing characteristics of S-LAH99

s-lah99w transmittance curve

  S-LAH99W (New product)
Eco Optical Glass
Refractive index nd 2.00100
Abbe number vd 29.14
(10 -7 K-1)
-30 ~ +70°C 75
+100 ~ +300°C 88
Transition point Tg (℃) 725
Yield point At (℃) 761
Coloring degree λ 70 405
λ 5 360
Chemical durability RW (P) 1
RA(P) 1
W(S) 1
SR 2.0
PR 1.0
Specific Gravity 5.02
Knoop hardness Hk 720〔7〕
Abrasion degree Aa 55
Catalog data details Download PDF
Available Shapes

・Polished Preforms
・Polished Lenses
・Aspherical Glass Mold Lenses



Glass Products