MWIR beam splitting cube

Example of specifications:
Material CaF2 optical grade
Cube: 1.0 x 1.0 x 1.0 inch
Angle: +/-10 arc min
Polishing: Scratch/Dig: 60/40
Surface Figure: 1 wave
Clear Aperture: 90%
Angle: +/-10 arc min
Scratch/Dig: 60/40
Coating: PR coating: R/T is 50/50 +/-20% at 45 degree AOI on the hypotenuse at 1.5-5.0 um

AR coating on the entrance and exit surfaces at 1.5-5.0 um