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Home  > Products and Service  > Optical products  > New Glass Types  > S-LAH52Q
New Glass Types


S-LAH52Q is an optical glass which has extremely large positive dn/dT. Cars are used in environments where the temperature change is large from below zero (cold district) to 50 C or above (inside car in summer). In the optical system of Automotive camera lenses, it's common that the focal length is fixed. Optical design considering refractive index fluctuations due to temperature change is necessary. By using S-LAH52Q among an optical system that includes glass lenses with low dispersion and negative dn/dT, it is expected that refractive index fluctuations can be modified efficiently. In addition, S-LAH52Q can be used for not only Automotive camera lenses but also projectors, photographic interchangeable lenses and various applications.

1.The largest positive dn/dT among OHARA glasses dn/dT (Dline 40℃~60℃) 10.3
2.Equivalent to S-LAH52 for nd and νd Different dn/dT can be selected from glasses with the
    same refractive index. 

(New Product)
(Current Product)
Eco Optical Glass
Refractive Index nd 1.79952 1.79952
Abbe Number νd 42.24 42.22
dn/dT relative
D Line 40~60°C
10.3 6.7
-30~70°C 60 60
+100~300°C 73 73
Transformation Point Tg(°C) 598 618
Yield Point At(°C) 622 636
Coloring λ80 390 395
λ5 335 330
Chemical ResistanceRW(P) 1 1
RA(P) 3 3
W(S) 2 1
SR 52.2 51.2
PR 2.0 2.0
Specific Gravity 4.47 4.41
Knoop Hardness Hk 620[6] 640[6]
Abrasion Aa 54 82
Detail Catalog DATA PDF PDF
Available shapes •pressing
•saw cut center-less
groundcylindrical blanks
•cut blanks
•saw cut center-less
groundcylindrical blanks
•cut blanks
Please consult us about available size and tolerance.

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