Pentra Prisms

We are engaged in offering excellent quality Pentra Prisms to our valuable clients. The deviation angle of 90A is thus independent of the orientation of the prism, making it especially important in applications in which the prism orientation cannot be precisely controlled. Due to geometry that total internal reflection cannot be used, the reflecting surfaces must be coated with a metallic or dielectric coating. The standard Penta Prism reflecting surfaces are coated with aluminum or enhanced aluminum. Sometimes, the coated surfaces are with black painting.

Specifications:
Material: N-BK7 or other optical glass
Dimension Tolerance: +0.0, -0.2mm
Surface quality: 60-40 S/D
Surface flatness: I /4 @ 632.8nm
Angle Tolerance: A 30 arc sec(Standard); A 5 arc sec(High Precision)
Clear Aperture: >85% of dimension
Bevel: <0.25mmA 45A
Coating: Surfaces S1 & S2 :Single layer MgF2 coating
Surfaces S3 & S4: Aluminized and painted black