Littrow prisms

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Littrow prisms
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 reverting the image.
Angle Tolerance, arcmin <10 arcmin
Bevel 0.4 mm x 45 deg
Clear Aperture, % >80%
Dimension Tolerances, mm +0.0/-0.2 mm
Protective chamfers <0,25 mm x 45 deg
Surface Flatness λ/4 @ 632.8 nm
Surface Quality, S-D 40-20 S-D
Description

Details

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

1-PLP-1-0127-0

UncoatedBK7
US$83.20

1-PLP-1-0127-1

Al+SiO2 coatedBK7
US$109.20

1-PLP-1-0220-0

UncoatedBK7
US$101.40

1-PLP-1-0220-1

Al+SiO2 coatedBK7
US$124.80
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