Calcium Fluoride (CaF2) single crystal is an optical material with high transmittance in ultraviolet, visible and infrared regions of the spectrum: 0.15 μm ~ 9 μm range. Calcium Fluoride is widespread used for optical windows, lenses and prisms in the IR application; especially pure grades find useful application in the UV and as UV Eximer (High power applications) laser windows.

Useful: This material has found wide use in high power laser optics due to its low absorption; polished surfaces are stable and will last several years under normal conditions; due to its low refractive index, Calcium Fluoride can be used without anti-reflection coating.

Main Properties

Crystal properties
Crystal Growth Method		Vacuum Stockbarger
Max. Size (mm)		<250
Optical properties
Transmission range (um)		0.15~9
Reflection Loss, % for two surfaces at 5 μm		5.4
Absorbance		1.7×10-4（3.8μm）
Refractive Index		See below
Wavelength (um)	Refractive Index (n)	Wavelength (um)	Refractive Index (n)
0.1495	1.5800	4.0000	1.4069
0.1612	1.5490	5.0000	1.3990
0.2000	1.4951	6.0000	1.3856
0.3000	1.4540	7.0000	1.3693
0.4000	1.4419	8.0000	1.3498
0.5000	1.4365	9.0000	1.3268
1.0000	1.4289	10.0000	1.3002
2.0000	1.4239	11.0000	1.2676
3.0000	1.4179	12.0000	1.2299
Transmission Curve		See below