Laser Line Beamsplitting Polarizer

Right-angle prisms are matched in pairs to produce high quality laser line beamsplitting polarizers with superior wavefront quality in both transmission and reflection. The hypotenuse face of one prism is coated with a multilayer dielectric beamsplitting coating optimized for laser performance. Two prisms are cemented together, protecting the critical coating from performance-degrading environmental factors.

Each cube separates an unpolarized incident beam into two orthogonal, linearly polarized components with negligible absorption. Following the principle of pile-of-plates polarizers, p-polarized light is transmitted with approximately 1000:1 contrast and s-polarization is reflected with approximately 20:1 contrast. These polarizers perform best with collimated or near-collimated light.

COMMON SPECIFICATIONS

• Substrate: N-BK7
• Surface Flatness (P-V @ 632.8 nm): ≤ λ/4 for p-polarized beam
• Surface Quality: 40 –20 scratch-dig
• Beam Deviation: Transmitted ≤ 3 arc-min
• Reflectance (per surface): ≤ 0.25%
• Contrast Ratio, Transmitted: ≥1,000:1
  Transmission: p-polarized light ≥ 95% transmitted, s-polarized light ≥ 99.8% reflected
• Storage Temperature: -50˚C to + 80˚C
• Operating Temperature: -50˚C to + 80˚C
• Laser Damage Threshold: ≥ 0.5 J / cm2, 10 ns