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Calcium Fluoride is good choice for optical bk7-windowswindows in the 0.15 μm – 9 μm range,which is relatively soft and somewhat hygroscopic so polishing, coating and handling are more critical than UV Fused Silica windows. In addition, The quality of a UV window can be extremely critical, it should be of high purity and polish in order not to affect the optical system.
Calcium Fluoride Windows are also applicable for a wide range of spectrum. It is particularly useful for wavelength at 2980nm laser application.
Due to its low refractive index, Calcium Fluoride can be used without anti-reflection coating