Overview: Equilateral dispersing prisms have three equal length sides. They are used for wavelength
separation applications such as refracting white light into a
rainbow pattern effect. Depending on the material used equilateral dispersion prisms can be
used over a wide range of wavelengths. We offer UV Fused silica
prisms for use in the ultra-violet wavelength, N-BK7 and other high
index materials like SF11 are used for visible applications. Star
Optic offers equilateral dispersing prims uncoated and AR coated.
Antireflective coatings help to improve output of the light as they
prevent light loss due to surface reflection. The exit beam is in general at an angle to the input beam, this
angle depending on the prism material, the wavelength and the
incidence angle. General Specifications of Equilateral Prism: | Material | BK7, UV grade Fused Silica, SF11 | | | Dimension Tolerance | +0/-0.2mm | | Flatness | λ/4@632.8nm | | 60° Angle Tolerance | <3 arc minutes | | Polished Surface | Three side surfaces polished | | Surface Quality | 60/40 scratch and dig | | Clear Aperture | >90% | | Chamfer | Protective<0.5mm@45° | | Coating | No coating, available |
Standard Products of Equilateral Prism: | PN. | Material | Length of Foce (mm) | Length (mm) | Apex Angle (°) | Coating | | ELP1212-BK7 | N-BK7 | 12.7 | 12.7 | 60 | Uncoated | | ELP2525-BK7 | N-BK7 | 25.4 | 25.4 | 60 | Uncoated | | ELP1212-FS | UVFS | 12.7 | 12.7 | 60 | Uncoated | | ELP2525-FS | UVFS | 25.4 | 25.4 | 60 | Uncoated | | ELP2525-SF11 | SF11 | 12.7 | 12.7 | 60 | Uncoated | | ELP2525-SF11 | SF11 | 25.4 | 25.4 | 60 | Uncoated |
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