• High Refractive Index
• Low Abbe Number for Maximum Dispersion
• Material: F2

This Thorlabs’ Dispersive Equilateral Prism, which is fabricated from F2, is 20 mm in size. This prism creates less stray light than diffraction gratings, thereby eliminating the higher order problems typically associated with gratings. Dispersive prisms are typically used at the minimum angle of deviation. This is the angle for which the wavelength of interest will travel parallel to the base of the prism, and the angle of incidence is equal to the angle of refraction when measured with respect to the normal of the prism face at the respective interface. At the minimum angle of deviation, a maximum clear aperture is achieved and reflective loss of P-polarized light is reduced since the angle of incidence is nearly Brewster's angle.

• Clear Aperture: 70%
• Surface Quality (Scratch-Dig): 40-20
• Angular Tolerance: ±5 arcmin
• Number of Polished Faces: 2 (one face and the bases are fine ground)
• A=B=C=H (mm): 50 ± 0.1
• Material: F2
• Minimum Angle of Deviation: 47.9° @ 633 nm
• V_d: 36.37
• Surface Flattness @ 633 nm: λ/10