Windows | Crystal Structure | Transmission Range (μm)
| Refractive index (μm) (n) | Absorption coefficient | Density (g/cm3) | Melting Point (K) | Hardness (Mohs) | Max. size (Inch) |
1 | Al2O3 | Hexagonal | 0.17 ~ 5 | 1.0 2.0 3.0 4.0 1.7545 1.7374 1.7015 1.6748 1.7460 1.7299 1.6920 1.6679 | 0.2 @ 0.2 μm 0.02 @ 0.4 μm 0.46 @ 5 μm | 3.98 | 2030 | 9 | 6 |
2 | BaF2 | Cubic | 0.18 ~ 12 | 0.2 0.5 1.0 5.0 1.5573 1.4779 1.4686 1.4511 10.0 12.0 1.4014 1.3696 | 0.2 @ 0.2 μm 0.08 @ 0.4 μm 0.13 @ 10.6 μm | 4.83 | 1354 | 3 | 6 |
3 | CaF2 | Cubic | 0.15 ~ 9 | 0.2 0.5 1.0 5.0 1.4951 1.4365 1.4289 1.3990 10.0 12.0 1.3002 1.2299 | 0.1 @ 0.2 μm 0.01 @ 0.4 μm 0.03 @ 2.6~2.9 μm | 3.18 | 1418 | 4 | 8 |
4 | Ge | Cubic | 2 ~ 18 | 2 5 8.0 10.0 4.1079 4.0153 4.0053 4.0040 11.0 15.0 4.0031 4.0017 | 0.02 @ 10.6 μm | 5.33 | 937 | 6 | 8 |
5 | LiF | Cubic | 0.12 ~ 6.5 | 0.2 0.5 1.0 3.0 1.4390 1.3943 1.3871 1.3666 5.0 6.0 1.3266 1.2975 | 0.05 @ 0.2 μm 0.02 @ 0.4 μm 0.03 @ 2.6~2.9 μm | 2.60 | 870 | 4 | 6 |
6 | LiNbO3 | Trigonal | 0.4 ~ 5 | 0.633 1.064 1.3 2.286 2.232 2.220 2.203 2.156 2.146 | 0.1 @ 1.064 μm | 4.64 | 1253 | 5 | 3 |
7 | MgF2 | Tetragonal | 0.13 ~ 7 | 0.2 0.5 1.0 3.0 1.4231 1.3797 1.3736 1.3618 5.0 7.0 1.3400 1.3044 | 0.07 @ 0.2 μm 0.02 @ 5 μm | 3.18 | 1255 | 6 | 3.6 |
8 | MgO | Cubic | 0.3 ~ 7 | 0.5 1.0 3.0 5.0 1.74 1.72 1.68 1.63
| - | 3.58 | 2800 | 5.8 | 2 |
9 | Si | Cubic | 1.2 ~ 15 | 3 5 6 7 3.432 3.422 3.420 3.419 8 10 3.418 3.417 | 0.01 @ 5 μm | 2.329 | 1410 | 7 | 6 |
10 | TiO2 | Tetragonal | 0.43 ~ 6 | 0.6 2.61 2.90 | - | 4.25 | 1840 | 7 | 1 |
11 | Y3Al5O12 | Cubic | 0.3 ~ 5 | 0.5 1.0 2.0 3.0 1.8450 1.8197 1.8035 1.7855 4.0 1.7602 | 0.06 @ 0.36 μm 0.02 @ 0.4 μm 0.01 @ 1.15 μm
| 4.55 | 1950 | 8.5 | 3.2 |
12 | YVO4 | Tetragonal | 0.4 ~ 5 | 0.63 1.3 1.55 1.9929 1.9500 1.9477 2.2154 2.1554 2.1486 | - | 4.22 | 1825 | 5 | 1 |
13 | ZrO2:Y | Cubic | 0.43 ~ 5 | 4 2.24 | - | 5.92 | 2780 | 8.7 | 2 |
14 | ZnSe | Cubic | 0.55 ~ 18 | 1.0 3.0 5.0 2.4376 2.4296 2.4067 10 12.0 15.0 2.4894 2.3936 2.3662 | 1.005 @ 10.64 μm | 5.26 | 1520 | 4 | 4 |
15 | ZnS | Cubic | 1 ~ 13 | 1.0 3.0 6.0 2.292 2.257 2.239 8.0 10.0 12.0 2.222 2.200 2.179 | 0.2 @ 10 μm | 4.09 | 1830 | 4.5 | 6 |
16 | ZnS | Cubic | 0.4 ~ 12.5 | 0.5 0.7 1.0 2.419 2.332 2.292 10 11 12 2.201 2.186 2.161 | 0.001 @ 2.7 μm | 4.09 | 1830 | 4.5 | 7.2 |
