Material: High grade BK7 or UV grade fused silica glass
Extremely low loss for p-polarized beam entering at the
  Brewster angle and exiting at the Brewster angle.
Entrance/exit faces may be S1/S2 or S2/S1
Incident beam deviated by 90o
Commonly used as a dispersion prism for beam separation

Pellin-Broca Prism Specifications

Geometry and beam dispersion

Dimension Tolerance:+0.0, - 0.2mm
Flatness: λ/4 at 632.8 nm
Surface Quality: 60-40 scratch and dig
Clear Aperture: >80%
Bevel:  0.2 mm to 0.5 mm x 45o
Designed wavelength: 546.1 nm