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Equilateral Prisms

  • Equal sides and equal angle of 60°
  • Typically used in minimum deviation
  • Substrate materials: BK7, UV fused silica, SF11, CaF2, MgF2 and ZnSe
  • AR coating optional
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Material SF11, UVFS, BK7, CaF2, MgF2, ZnSe  Clear Aperture >90%
Dimension Tolerance +0.0/-0.2mm Surface Quality 60/40 S/D
Angle Tolerance 60°±3 arc minutes Flatness <λ/4@632.8nm
Polished Surface Three side surfaces polished Chamfer Protective<0.5mmx45°
Coating None,available

Equilateral prism is a kind of dispersion prisms which have three equal 60°angles, which is the most typical type made of high difference of refraction indexes for different wavelength. Equilateral prisms is typically used at minimum angle of deviation. When light beam travels parallel to the base of prisms, and the angle of incidence is equal to the angle of emergence when both angles measured with respect to the surface normal, the deviation would be minimized.

Hangzhou Shalom EO offers the equilateral prisms made from substrate materials of BK7, UV fused silica, SF11, CaF2, MgF2 and ZnSe, covers ultra-violet (UV) to infrared (IR) wavelength spectrum.