Dispersing prism
Dispersion prisms separate wavelengths because material refractive index varies with wavelength, resolving spectral lines after two refractions. They split white light into constituent colors, generally using collimated input and forming a spectrum at a lens or curved-mirror focal plane. In lasers, they separate two wavelengths sharing a path, with sufficient propagation distance for spatial separation. Different entrance and exit angles produce magnification in the dispersion plane for one-dimensional anamorphic expansion/compression or asymmetric beam shaping. Equilateral dispersion prisms have three 60° angles and use strongly dispersive materials such as SF10. Isosceles dispersion prisms have 30°–60°–90° angles and also use materials such as SF10. Littrow prisms disperse light and reverse the path using a mirror-coated rear surface. Pellin–Broca prisms combine dispersion with 90° deflection; rotation about axis A selects wavelength. Brewster prisms work with polarized light: at Brewster incidence, P polarization transmits without loss and S polarization reflects. Amici/direct-vision prisms disperse polychromatic light while correcting beam divergence, with dispersed outputs parallel to the input. Three prisms are cemented together; the two A prisms differ in material from the B prism, typically flint glass for A and crown glass for B.
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Overview
Specifications
| Parameter | Value |
|---|---|
| Material | Selectable as required, e.g. UV fused silica, MgF₂, SF-10, BK7, etc. |
| Machining dimensions | 4～100 mm |
| Dimensional tolerance | ±0.1mm |
| Clear aperture | >90% |
| Surface imperfections | 60/40 |
| Surface figure λ [@632.8 nm] | λ/2 @ 632.8 nm |
| Angle Tolerance | ±3′ |
| Pyramidal angle tolerance | ±5′ |
| Coating | Uncoated 、 Antireflection, polarizing, high-reflection, and other coatings |
Datasheet
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Supplier Information
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