Brewster Windows

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 10/5 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.

  We offer standard Brewster windows in elliptical shapes with a minor axis of 12.7, 15.0, 19.1 or 25.4 mm:  Other sizes  can be quoted on request.

These windows are uncoated, but we will be pleased to offer coatings to meet your special requirements.

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