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CaF2 is a low index (1.40 @ 4 microns) material which is used in a wide variety of commercial applications. In spectroscopy it is a substitute for SiO2 materials, fused quartz, fused silica, BK-7, Suprasil®, Infrasil®, etc. In near-IR applications it is superior to these materials because it has no OH absorption to limit the accuracy of quantitative results. Since it is easy to polish to tight specifications it is the material of choice for near-IR beamsplitters and windows.
Advantages
Disadvantages
Melting Point: 1360 °C
Density: 3.18 g/cm3
Solubility in H2O: 0.05 g/100 g at 20 °C
Hardness: 158.3 kg/mm2
Appearance: Crystalline clear
Mid-IR Transmission – 3 mm thick CaF2 window
WAVELENGTH (Microns) | INDEX |
---|---|
0.48615 | 1.43704 |
0.58758 | 1.43388 |
0.58932 | 1.43384 |
0.6563 | 1.43249 |
0.68671 | 1.432 |
0.72818 | 1.43143 |
0.76653 | 1.4276 |
0.884 | 1.4298 |
1.014 | 1.42884 |
1.08304 | 1.42843 |
1.1 | 1.42834 |
1.1786 | 0.42789 |
1.25 | 0.42752 |
1.3756 | 1.42689 |
1.4733 | 0.42642 |
1.5715 | 1.42596 |
1.65 | 0.42558 |
1.768 | 1.42502 |
1.84 | 1.42468 |
1.8688 | 0.42454 |
1.9 | 1.42439 |
1.9153 | 1.42431 |
1.9644 | 1.42407 |
2.0582 | 1.4236 |
2.0626 | 1.42357 |
2.1608 | 0.42306 |
2.25 | 1.42258 |
2.3573 | 1.42198 |
2.45 | 0.42143 |
WAVELENGTH (Microns) | INDEX |
---|---|
2.5537 | 1.4208 |
2.6519 | 0.42018 |
2.7 | 1.41988 |
2.75 | 0.41956 |
2.800 | 0.41923 |
2.88 | 1.4189 |
2.9466 | 0.41823 |
3.05 | 1.4175 |
3.098 | 0.41714 |
3.2413 | 1.4161 |
3.4 | 1.41487 |
3.5359 | 1.41376 |
3.8306 | 1.41119 |
4.0 | 1.40963 |
4.1252 | 1.40847 |
4.25 | 1.40722 |
4.4 | 1.40568 |
4.6 | 1.40357 |
4.7146 | 1.40233 |
4.8 | 1.4013 |
5.0 | 1.39908 |
5.3036 | 1.39522 |
5.8932 | 1.38712 |
6.4825 | 1.37824 |
7.0718 | 1.36805 |
7.6612 | 1.35675 |
8.2505 | 1.3444 |
8.8398 | 1.33075 |
9.4291 | 1.31605 |
Specific index listed; Generic: 1.40 @ 5 microns
Short Wavelength Limit: 79,500 cm-1 (1 mm)
Long Wavelength Limit: 896 cm-1 (2 mm), 1025 cm-1 (4 mm)
Broad band (visible to 8 microns) beamsplitters for FT near-IR spectrometers are in routine production. Narrow band anti-reflective (AR) coatings for laser applications can also be done. CaF2 is often used as a substrate for interference filters.
Short and Long Wavelength Ranges defined for which transmissivity is greater than 50% of stated crystal thickness.
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