Brewster windows are used in laser cavities to reject the s-polarized beam and to allow only linearly p-polarized light to be emitted. They are designed for use at the Brewster angle where the reflective polarization effect is most efficient.
These windows are cut at the appropriate angle so that they present a circular cross-section to the laser cavity. They are made either of BK7 with a Brewster angle of 56.5°or UV fused silica with a Brewster angle of 56.0°. Brewster windows are polished to 20/10 or better to be of intra-cavity laser quality. Flatness is not so critical, so they can be made to a flatness of between λ/2 and λ/4. This enables them to be kept relatively thin, between 1.5 and 2.0 mm.
These windows are uncoated, but we will be pleased to offer coatings to meet your special requirements.
| Standard Specifications: || |
see the table
±5 are minutes
λ/4 at 632nm
<0.25mm X 45°
available upon request
| Standard Brewster Windows|
Minor Diameter D (mm)