Glan Prisms for High Power Applications

For the visible and UV

The prisms are produced from high-grade calcite almost free of any striae or bubbles. The spectral range is about 350 to 2700 nm (above 2 µm absorption bands of the deflected beam occur). The extinction ratio is 10^-6 for the undeviated ray.
Special attention has been given to the polishing of the surfaces to prevent stray light. The prisms are rated up to 300 MW/cm² for nsec-pulses.
The prisms have two side exit windows. The prism halves are separated by an air gap of approx. 0.07 mm and are supplied mounted in a holder as standard.
Flatness of the outer surfaces is around λ/2. Flatness of the side exit faces is around 3 λ. Prismatic deviation is less than 2'.
The usable field of view is about 8° and is symmetrical at 700 nm; in the IR and UV wavelengths the field of view is asymmetrical (see diagram at Glan-Polarizing Prisms).

For the UV

For high-performance applications in UV (λ < 350 nm) the prisms described in the above specifications are produced from the best calcite available which is also selected to be free of fluorescence. This material is chosen so that it yields the lowest attainable levels of absorption in UV.

Interferometer quality

Same specifications as above except that the light entrance, exit, and inner faces are polished to a flatness of λ/10 (flatness of side exit window around 3 λ). Deformation of a transmitted plane wave is less than λ/10.

Available on special order

• These prisms can be set in a box mount with a large air gap to direct the reflection on the inner surfaces out of the prism. → PGH 0
• Antireflection coatings → on request