Beam Displacer

A Beam Displacer splits an unpolarized light beam into two orthogonally polarized beams which are parallel to each other. The most widely used materials for beam displacers are Yttrium Vanadate (YVO4) crystal, Barium Borate (α-BBO) crystal, Calcite crystal and Rutile crystal. Among the four materials, YVO4 crystal is the most popular material due to the thermal and mechanical properties, and large birefringence.


Specifications :




  • Optical Axis Orientation Tolerance: ± 0.5°
  • Flatness: λ/4 @ 633mm
  • Surface Quality: 20/10 scratch & dig
  • Dimension Tolerance: ±0.05mm
  • Parallelism: 15 arc seconds
  • Perpendicularity:10 arc minutes
  • Wavefront Distortion: λ/4 @ 633mm
  • Clear Aperture: ≥95%@central area
  • Coating: Based on customer require