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Non-Polarizing Beamsplitter Cubes (NPBSC)

  • Minimal polarization sensitivity with some absorption
  • With multi-layer beamsplitter coating
  • With anti-reflection coating

These beamsplitters have minimal polarization sensitivity. Therefore they may be used in polarized optical systems.

Due to the metallic component of the hybrid coating, these beamsplitters are not intended for use with high power lasers since they show some absorption – typically about 8%. Non‑polarizing beamsplitters are less sensitive to changes in angle of incidence than pure dielectric unpolarized beamsplitters.

The beamsplitter cube consists of a pair of precision right-angle prisms carefully cemented together to minimize wavefront distortion and beam skewing. The hypotenuse of one prism is coated with a multilayer beamsplitter coating tuned to the application. The four outside surfaces of the prism are anti-reflection (AR) coated with “V” type or broadband coatings to minimize surface reflection losses over the specific wavelength range.

SpecificationAvailable Quality
Range of dimensions0.8mm-100mm
Range of splitting ratios50/50 (R/T*)
Accuracy of splitting ratio±3% (single wavelength); ±5% (broadband)
Highest available surface figureλ/10 (DIN: 3/0.2)
Highest available surface quality20-10 S/D (DIN: 5/2×0.06)
Wavelength rangesingle wavelength or broadband
Highest available tolerance of beam deviation5″ (arcsec)

*: |Ts-Tp|<5-15%; |Rs-Rp|<5-15% dependent on bandwidth

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