Littrow
Prisms
Littrow
prisms are retro-reflecting dispersing prisms which have been arranged so that a
beam entering at the Brewster angle undergoes minimum deviation and hence
maximum dispersion.
They are used in laser cavities to fine tune lasers by
selection of wavelength. By
altering the angle of incidence slightly it is possible to enhance certain
wavelengths and eliminate others. These
prisms have a very low loss for the p-polarized beam.
These prisms are made from UV fused silica. The apex angle, θ is
55°32’
The
accuracy of these prisms is controlled by the precision of the prism angles. They are made to an accuracy of 10 arc minutes.
We
offer Littrow prisms uncoated but special coatings can be applied on request.
We can supply Littrow prisms in the following standard sizes: 12.7, 19.1, 25.4
mm.
Other sizes will be considered on
special request.
