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S-LAL20 has negative dn/dT
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S-LAL20 is an optical glass with negative dn/dT. In Automotive camera lens systems, the focal length is often a fixed distance. Refractive index fluctuations within the optical system should certainly be a consideration, as cars are used in environments where the temperature range can vary widely from below zero in colder climates to more that 50°C inside a car on a summer day. Since many optical glasses have positive dn/dT values, the refractive indices fluctuations due to temperature change can be adjusted efficiently when these materials are combined with S-LAL20. In addition to Automotive camera lens systems, S-LAL20 can also be used for Projectors, Interchangeable Photographic lenses, and various other applications.
Advantages
- Negative dn/dT
- The highest refractive index among glasses with negative dn/dT in LAL optical region
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Details
Type |
Code |
nc |
nd |
nF |
ng |
vd |
s.g. |
Coloring |
S-LAL20 |
699511 |
1.69520 |
1.69930 |
1.70888 |
1.71647 |
51.11 |
4.38 |
370/310 |



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