CaF20 pages
Calcium fluoride (CaF?)
1. Crystallographic characteristics
Crystal system cjass | Lattice parameters | Cleavage | ||
group | a | c | ||
Cubic m 3 m | 5.462 a | Perfect along (111) |
2. Optical characteristics
ne | np' nc. | nio,5 | ng,o - ni2,5 | Internal transmittance coefficient | Refractive index | ||||
l. mkm | ti (1) | l, mkm | n(D | ||||||
1.4349 | 0.0043 1.2996 | 0.2 0.5 1.0 2.0 | 1.4951 1.4365 1.4289 1.4239 | ||||||
Attenuation coefficient m i less than | [l ), cm"1, | ||||||||
CF - U | CF | - V | CF | - I | 0.2 0.5 | 0.87 0.97 | |||
0.10 (0.2 mkm) | 0.01 (0.4 0,05 (7.5 mkm) mkm) | 1.0 3.0 5.0 6.0 7.0 8.0 9.0 10.0 | 0.99 0.99 0.99 0.98 0.87 0.88 0.59 0.19 | 3.0 4.0 5.0 6.0 | 1.4179 1.4098 1,3990 1.3856 1.3693 1.3498 1.3268 1.3002 1.2676 1.2299 | ||||
Thermal coefficient of refractive index at m =3.39 mkm, 10"5 0C_1 in range of ± 60°C | Transparency range, mkm (10 mm width) | 7.0 8.0 9.0 10.0 11.0 12,0 | |||||||
(-0.95) | ■ (-1.17) | 0.15 - 9.0 |