Pellin-Broca prisms have an interesting property, the light at the required wavelength is deviated by 90° with the wavelength being selected by the angle of rotation of the prism.
The UV fused silica version shown below has its input and output faces at Brewster’s angle for a wavelength of 240nm. This gives a very high transmission for correctly polarized light.
||60-40 scratch/ dig
If you require wedge prisms up the 6” diameter.
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