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Non-Polarizing Beamsplitter (NPBS)

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敘述

Non-Polarizing Beamsplitters are available in two forms: plates and cubes. The low polarization dependence of the metallic-dielectric coating allows the transmission and reflection for S- and P-polarization states to be within 3% of each other. This means that they will not change the state of polarization of the incident beam.

Keysight NPBS diagram

Keysight NPBS line drawing

Main Specifications

  • Material BK7, fused silica, other optical glass
  • Dimension Tolerance ±0.2 mm
  • Flatness λ /20 @ 632.8 nm per 25 mm
  • Surface Quality 20/10 scratches and dig
  • Transmitted Wavefront λ /8 @ 632.8 nm per 25 mm
  • T/R ratios1 0/100, 15/85, 33/67, 40/60, 50/50, 60/40, 67/33 , 100/0 ±2%, for random polarization
  • Beam Deviation <20 arc seconds

1 T=(Ts+Tp)/2, R=(Rs+Rp)/2 with small differences between Ts-Tp and Rs-Rp

For typical characteristics and examples of non-polarizing beamsplitters click on Transmission- Reflection graphs and photo