Optical glass type S-LAH99W: Improved internal transmittance in the 360-550nm range.

Optical Glass with 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
Type Code nc nd nF ng vd s.g. Coloring
S-LAH99W 001291 1.99105 2.00100 2.02540 2.04600 29.14 5.02 (405)/360
S-LAH99W Transmittance Curve
S-LAH99W (New Product)
Eco Optical Glass
Refractive index nd 2.00100
Abbe number vd 29.14
CTE α(10 -7 K-1) -30 ~ +70°C 75
+100 ~ +300°C 88
Eco Optical Glass 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
Available Shapes ・Pressings ・Polished Preforms ・Polished Lenses ・Aspherical Glass Mold Lenses