the refractive index(nd) of h-bif200 is 2.00272 while the abbe number(υd) is 19.32. comparing with the glass with refractive index(nd) over 2.0 such as h-zlaf95, h-bif200 has the lower abbe number and higher dn/dt coefficient.
glass name | h-zlaf95 | h-zlaf80a | h-bif200 | |
refractive index | nd | 2.0509 | 2.00069 | 2.00272 |
abbe number | υd | 26.94 | 25.46 | 19.32 |
relative partial dispersion | pg,f | 0.604 | 0.6159 | 0.6419 |
anomalous dispersion | ⊿pg,f | 0.0052 | 0.0146 | 0.0304 |
internal transmittance | 460 | 0.944 | 0.945 | 0.915 |
420 | 0.854 | 0.857 | 0.675 | |
internal transmittance | 460 | 0.892 | 0.894 | 0.838 |
420 | 0.729 | 0.735 | 0.456 | |
relative | d(-60～-40) | 2.9 | 3.3 | 6.4 |
d(-40～-20) | 3.2 | 3.7 | 6.8 | |
d(-20～0) | 3.4 | 3.9 | 7.1 | |
d(0～20) | 3.6 | 4.1 | 7.5 | |
d(20～40) | 3.7 | 4.2 | 7.8 | |
d(40～60) | 3.9 | 4.5 | 8.2 | |
d(60～80) | 4.2 | 4.7 | 8.5 | |
d(80～100) | 4.4 | 4.9 | 8.7 | |
d(100～120) | 4.7 | 5.3 | 9.3 | |
d(120～140) | 5.1 | 5.5 | 9.6 | |
d(140～160) | 5.3 | 5.7 | 9.9 | |
density | ρ(g/cm3) | 5.27 | 4.76 | 5.1 |