the refractive index(nd) of h-zlaf54a is 1.81600 while the abbe number(υd) is 46.55. comparing with h-zlaf50 material，h-zlaf54a material has the higher refractive index. and h-zlaf54a material has the lower cost than h-zlaf54 material.
material name | h-zlaf50 | h-zlaf54 | h-zlaf54a | |
refractive index | nd | 1.80400 | 1.81600 | 1.81600 |
abbe number | υd | 46.58 | 46.55 | 46.55 |
relative partial dispersion | pg,f | 0.5567 | 0.5551 | 0.5574 |
anomalous dispersion | ⊿pg,f | -0.0095 | -0.0112 | -0.0089 |
internal transmittance | 460 | 0.991 | 0.996 | 0.992 |
400 | 0.973 | 0.966 | 0.971 | |
370 | 0.918 | 0.942 | 0.908 | |
chemical stability | rc | 1 | 1 | 1 |
ra | 2 | 2 | 1 | |
dw | 1 | 1 | 1 | |
da | 3 | 3 | 3 | |
roh | 1 | 1 | 1 | |
rp | 1 | 1 | 1 | |
density | ρ(g/cm3) | 4.47 | 5.04 | 4.99 |