Uncoated prisms can be used to disperse the light into spectrum Aluminium coated (B face) prisms diverts the beam at a 60 deg angle without inverting or reverting the image

Standard Specifications Material BK7 Dimension Tolerances +0.0, -0.2 mm Surface Flatness <λ/4 @ 632.8 nm Angle Tolerance +/- 10 arcmin Bevel 0.4 mm x 45 deg Surface Quality 40-20 scratch & dig

Littrow prisms usually are 30 - 60 - 90 deg prisms. The uncoated Littrow prism can disperse white light into its spectrum; the coated Littrow prism diverts the beam at a 60 deg angle without inverting or reversing the image. Littrow prisms can also be used as retro-reflecting Brewster prisms, as shown in the picture. They are positioned so that beam which enters front side of prism suffers Brewster anlge and falls normal to the flat surface and is reflected back along the same path. They are useful in laser cavities where the wavelength of the return beam can be selected by tilting the prism slightly. In this way the gain of the cavity can be tuned to a specific laser line.

5PM131 Prism/Optics Mount	5PMF57 Universal Prism/Optics Mount	6PT169 Three Angle Prism/Beamsplitter Table
6PT110 Tilt/Rotation Stage	5OM37-50 Two Angular Fine Adjustment Mounts	7FA3 Roll & Pitch Tilt Platform

BK7 Littrow Prisms14LP-1-014LP-1-114LP-2-014LP-2-1