Dispersion Prisms

Besides the Reflection Prisms, UPT also offers the Dispersion Prisms. The most typical dispersion prism is equilateral prism made of high difference of refaction indexes for different wavelengths. The dispersion prisms of special use are: Litrow prisms, Pellin-Broca prisms, Brewster prisms, Amici Prisms.

(1)EQUILATERAL dispersion prism
EQUILATERAL dispersion prisms have three equal 60® angles, which are made of optical materials with high difference of refraction indexes for different wavelength, such as the SF10.


(2)LITTROW prism
Light crossing the LITTROW prism is spectrally dispersed with simultaneous inversion of the path of rays caused by the reflection taking place on the back surface of the prism. The reflection surface has to be mirrored coating.


(3) AMICI prism (Direct Vision Prisms)
The AMICI prisms generate dispersion of polychromatic light with simulaneous correction of divergence. All the dispersed beam output from the prism are parallel to the input beam. These Prisms consist of three prisms, which are cemented together. Two of the three prisms (A prism in the left draft) are made of different material to the other prism (B prism in the left draft). Typical combination of materials are Flint galss for A and Crown glass for B.



Specifications:
Material:
BK7, Fused silica,N-SF10, MgfF2 or other optical glass upon request
Dimension (mm):
4-280mm upon request.
Dimension Tolerance (mm):
+/-0.1
Angle Tolerance:
¯ 3 arc minutes
Pyramid error:
¯ 5 arc minutes
Flatness (per 25mm@633nm):
λ(General), λ/8 (High Precision)
Clear Aperture:
>80% (small size),>90%(large size)
Bevel (mm):
0.1-0.3
Surface Quality:
60/40 (General), 20/10 (High Precision)
Coating:
Uncoated ,AR,HR,PR coating upon request



Note:
According to Customer's requirement, we can make non-standard Dispersion Prisms with significantly higher optical parameters. Surface quality better than 10/5, flatness better than λ/10, angle tolerance better than +/-10 arc sec is available. Prism in mounting is also available.