S-LAM73 is an optical glass which has negative dn/dT at the region of LAM.
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-LAM73. In addition to Automotive camera lens systems, S-LAM73 can also be used for Projectors, Interchangeable Photographic lenses, and various other applications.
Negative dn/dT at the region of LAM
dn/dT(Dline 40℃~60℃) -0.8
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)