eSource Optics offers both VUV Grade CaF2 Right-Angle Prisms and VUV Grade CaF2 Equilateral Dispersive Prisms.  

Calcium Fluoride:  Calcium Fluoride (CaF2) exhibits good transmission properties from ~ 140nm Vacuum UV (VUV) to ~ 8.0um in the Infrared.  CaF2 is a relatively soft crystalline material and care should be taken as CaF2 is sensitive to mechanical and thermal shock.  CaF2 is a cubic single crystal optical material.
 

eSource Optics VUV Grade CaF2 Right-Angle Prisms (RAP) are commonly used for image rotation and redirection of Vacuum Ultraviolet (VUV) through UV light.  VUV Grade CaF2 Right-Angle Prisms can be used to deviate a VUV through UV light path by 90° or 180°, depending on which surface is used as the input for the light source. Due to total internal reflection (TIR), our VUV Grade CaF2 Right-Angle Prisms can be used as a 90° bending prism or reflector. When the input VUV through UV light is incident on one of the prism's legs, it undergoes TIR at the glass/air boundary of the hypotenuse and exits via the other prism leg. This 90° deviation of the input light makes the right angle prism a suitable alternative for a UV mirror. 

eSource Optics VUV Grade CaF2 Equilateral Dispersive Prisms (EDP) are fabricated with three equal sides and angles with two opposite faces that are polished   These prisms are typically used to disperse (refract) white light into its component wavelengths and are typically used at the minimum angle of deviation. This is the angle for which the wavelength of interest will travel parallel to the base of the prism, and the angle of incidence is equal to the angle of refraction when measured with respect to the normal of the prism face at the respective interface (see the diagram). At the minimum angle of deviation, a maximum clear aperture is achieved and reflective loss of P-polarized light is reduced since the angle of incidence is nearly Brewster's angle. eSource Optics VUV Grade CaF2 Dispersive Prisms also create less stray UV light than diffraction gratings, thereby eliminating the higher order problems typically associated with gratings.
 

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More information can be found on our Material Properties Page.   For more information about Right Angle Prisms, refer to our Optics Tutorial page.