| Material | Transmission Range | Refraction Index Range | Reflection Loss | Thermal Expansion Coefficient |
Density (g/cm3) | (kg/mm2) |
| BAK1 | 280 nm to 2.5 µm | 1.545 to 1.613 | <2% @ 365 nm to1.53 µm | 8.6 x10-6/K @ 300 K | 3.19 | 530 |
| Barium fluoride (BaF2) |
150 nm to 12 µ | 1.41 to 1.82 | 6.5% @ 5 µm(1.45 @ 5 µm) | 18.1 x10-6/ °C @ 273 K | 4.893 | 82 |
| BK7 | 350 nm to 2.5 µm |
1.513 to 1.536 (1.517 @ ~587 nm) |
8.1% @ ~587 nm | 7.1 x 10-6/ K | 2.51 | 610 |
| Calcium fluoride (CaF ) |
130 nm to 10 µm |
1.31 to 1.58 (1.399 @ 5 µm) |
5.4% @ 5 µm | 18.85 x 10-6/ °C | 3.18 | 158.3 |
| Cadmium telluride (CdTe) |
850 nm to 20 µm |
2.57 to 2.88 (2.653 @ 10 µm) |
32% @ 10 µm | 5.9 x 10-6/ K @ 293 K | 6.2 | 45 |
| Cesium bromide (CsBr) |
250 nm to 40 µm | 1.56 to 1.71 | 11.6% @ 11 µm | 47.9 x 10-6/ °C @ 273 K | 4.44 | 19.5 |
| Crystal quartz (SiO2) |
180 nm to 3.5 µm; >40 µm | 1.521 to 1.661 | 8.8% @ 600 nm | 7.1 x 10-6 to 13.2 x10-6/ °C | 2.649 | 741 |
| Fused-silica (SiO2) |
180 nm to 2.2 µm |
1.41 to 1.55 (1.47 @ 4 µm) |
7% @ 400 nm | 0.55 x 10-6/ °C @ 300 K | 2.203 | 500 |
| Gallium arsenide (GaAs) |
0.9 to 16 µm |
3.19 to 3.49 (3.2727 @ 10.33 µm) |
44% @ 10.33 µm | 5.7 x 10-6/ °C @ 300 K | 5.315 | 750 |
| Germanium (Ge) |
1.8 to 23 µm |
4.0021 to 4.1020 (4.0026 @ 11 µm) |
53% @ 11 µm | 6.1 x 10-6/ °C @ 298 K | 5.33 | 780 |
| Lithium fluoride (LiF) |
120 nm to 6 µm |
1.30 to 1.91 (1.392 @ 600 nm) |
5.2% @ 600 nm | 37 x 10-6/ K @ 283 K | 2.639 | 102 |
| Magnesium fluoride (MgF2) |
120 nm to 7 µm |
1.31 to 1.78 (1.413 @ 220 nm) |
5.7% @ 220 nm | 8.9 x10-6 to 13.7 x10/ K | 3.18 | 415 |
| Potassium bromide (KBr) |
230 nm to 25 µm |
1.425 to 1.589 (1.527 @ 10 µm) |
8.3% @ 10 µm | 43 x 10-6/ K @ 300 K | 2.753 | 7 |
| Pyrex | 290 nm to 2.8 µm | 1.473 @ 589 nm | 10% @ 340 nm to 2.2 µm | 3.3 x 10-6/ °C | 2.23 | 481 |
| Sapphire (Al2O3) |
170 nm to 5.5 µm |
1.607 to 1.929 (1.754 @ 1.06 µm) |
14% @ 1.06 µm | 5.0 x 10-6 to 5.6 x10-6/ K | 3.97 | 2000 |
| Silicon (Si) |
1.2 to 15 µm |
3.417 to 3.497 (3.422 @ 5 µm) |
46.2% @ 5 µm | 2.6 x 10-6/ °C @ 20 °C | 2.33 | 1150 |
| Titanium oxide (TiO2) |
430 nm to 5 µm |
2.24 to 2.853 (2.555 @ 690 nm) |
30% @ 2 µm | 7.1 x 10-6 to 9.2 x 10-6/ °C | 4.26 | 879 |
| Zerodur | 400 nm to 2.5 µm |
1.513 to 1.559 (1.542 @ 587.6 nm) |
4.6% @ 587.6 nm | 0.2 x 10-6 to 0.10 x10-6/ K | 2.53 | 620 |
| Zinc selenide (ZnSe) |
600 nm to 21 µm |
2.327 to 2.675 (2.403 @ 10.6 µm) |
29.1% @ 10.6 µm | 7.1 x 10-6/ °C @ 273 K | 5.27 | 120 |
| Zinc sulfide (ZnS) |
1 to 13 µm |
1.998 to 2.516 (2.192 @ 10.6 µm) |
24.6% @ 10.6 µm | 6.6 x 10-6/ °C @ 273 K | 4.08 | 160 |
