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S-LAM73 is an optical glass which has negative dn/dT at the region of LAM.
Cars are used in environments where the temperature change is large from below zero (cold district) to more than 50 C (inside car in summer). In the optical system of Automotive camera lenses, it's common that the focal length is fixed. Since many optical glasses have positive dn/dT, by combining these optical glasses with S-LAM73, it is expected that refractive index fluctuations due to temperature change can be adjusted efficiently. In addition, S-LAM73 can be used for not only Automotive camera lenses but also projectors, photographic interchangeable lenses and various applications.

1.Negative dn/dT at the region of LAM
    dn/dT(Dline 40℃~60℃)      -0.8
2.The highest refractive index among glasses with negative dn/dT at the region of low dispersion
    nd approximately    1.8
   (Until now S-LAL20 had the highest nd.    The nd value is approximately 1.7)  

Eco Optical Glass
Refractive Index nd 1.79360
Abbe Number νd 37.09
dn/dT relative
D line 40~60°C
-30~70°C 89
+100~300°C 105
Transformation Point Tg(°C) 623
Yield Point At(°C) 658
Coloring λ80 415
λ5 350
Chemical ResistanceRW(P) 1
RA(P) 4
W(S) 3
SR 52.2
PR 2.2
Specific Gravity 4.45
Knoop Hardness Hk 570[6]
Abrasion Aa 182
Detail Catalog DATA PDF
Available shapes •pressing
•saw cut center-less ground
cylindrical blanks
•cut blanks
Please consult us about available size and tolerance.

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