Littrow Prisms

Littrow Prisms

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Material BK7
Dimension tolerances +0/-0,2 mm
Surface Flatness < λ/4 @ 633 nm
Angle Tolerance +/- 10 arcmin
Bevel 0.4 mm x 45o
Surface Quality < 40/20 scratch & dig
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Attention! You can customise this product to your needs.
Littrow prisms can also be used as retro-reflecting Brewster prisms, as shown in the picture. They are arranged to that a beam entering at the Brewster angle 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.
varna Uncoated prisms can be used to disperse the light into spectrum
varna Aluminium coated (B face) prisms diverts the beam at a 60deg angle without inverting or reverting the image

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