Brewster Prisms
The Brewster dispersion prisms are used for dispersion
and 90° deviation of linearly polarized light (p-polarization), with
no reflection losses. It consists of one solid glass block with three polished
surfaces.
The angle α is calculated so that the wave polarized
parallel to the plane of incidence (p-polarization) completely enters the
prism and then exits it again without any reflection losses, when the total
deviation is 90°. This condition can only be achieved accurately for
one wavelength.
The three polished faces are plane to less than λ/10. The angle errors are less than 2'.
| δ | Rp (280 nm) | Rp (200 nm) | ||
| αB + δ | αB δ | αB + δ | αB δ | |
| 0.00 ° 0.05 ° 0.10 ° 0.30 ° 0.95 ° 3.00 ° |
0 % 0.00004 % 0.00015 % 0.00120 % 0.01201 % 0.12095 % |
0 % 0.00002 % 0.00011 % 0.00105 % 0.01062 % 0.09733 % |
0.01114 % 0.01004 % 0.00899 % 0.00537 % 0.00000 % 0.05711 % |
0.01114 % 0.01229 % 0.01350 % 0.01887 % 0.04193 % 0.16350 % |
The above table shows how reflectivity Rp of one surface is dependent upon small deviations δ from the Brewster angle αB. The material Suprasil and a wavelength of 280 nm have been chosen for this example. The two columns to the right similarly show which reflections occur when this prism is used at 200 nm.
| Beam cross-section | Ordernr. | Price 1 pc. | Price 2-5 pc. | Price 6-10 pc. |
| 10 x 10 mm 15 x 15 mm 20 x 20 mm |
DBR 10 DBR 15 DBR 20 |
€ 546 € 720 € 1040 |
€ 468 € 617 € 891 |
€ 364 € 480 € 693 |
Standard prisms are available in fused silica Suprasil.
Ordering information
When ordering, please enquire about prisms (wavelengths)
which are currently available from stock.
Other sizes or materials
→ on request
Data sheet