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 The prism with the plane surfaces at slight angles(which divert the paths of light through angles by refraction instead of reflection) are called optical wedges. Optical wedges are used in fire control and optial alignment instruments; they may be used where the angle of deviation required is a matter of fractions of seconds. The angle at which a wedge diverts a path of light depends on the angle between the entrance and emergence faces and the index of refraction of the glass.
Material: Fused Silica
Design Wavelenght : 308nm n=1.48575
Diameter Tolerance: +0.0, -0.1mm
Thickness Tolerance: ±0.2mm
Surface Quality: 60/40
Wedge Angle: ±1 minute
Flatness: λ/4 @632.8nm
Bevel: <0.25mm X 45°

Part No.  φ(mm)  β (mm)  α (mm) 
WED2-101 25.4 2°4'
WED2-102 25.4 4°7'
WED2-103 25.4 8°14'
WED2-104 25.4 12°21'