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Equilateral dispersing prisms are used for wavelength separation applications. The three sides are of equal length. A light ray is twice refracted passing through the prism with total deviation denoted by qd in the figure below. Deviation is a function of refractive index, and hence wavelength. Angular dispersion Dqd is the difference in deviation for light rays having different wavelengths and varies with prism orientation.

  • Reflection losses are minimized for un-polarized rays traveling parallel to the base of the prism. This condition is called minimum deviation.
  • Minimum deviation occurs when the ray and wavelength angle of incidence at the entrance surface are equal to the angle of emergence (both angles measured with respect to the surface normal).
  • Antireflection coatings help reduce polarization at the prism surfaces by increasing total transmittance.

General Specifications:

Parameter Value
Material F2 glass
Dimension tolerance +/-0.2mm
Surface flatness l/2
Angle tolerance +/-3 arc min
Surface quality 60-40
Coating Optional

PN Description Size Length Volume Price
TRA010 Equilateral prism, F2, 10mm 10 10 Request Volume Quote
TRA015 Equilateral prism, F2, 15mm 15 15 Request Volume Quote
TRA020 Equilateral prism, F2, 20mm 20 20 Request Volume Quote
TRA025 Equilateral prism, F2, 25mm 25 25 Request Volume Quote
TRA030 Equilateral prism, F2, 30mm 30 30 Request Volume Quote


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