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Unpolarized Beamsplitter Cubes

Useful for natural, incoherent or unpolarized light. It is advised not to use these cubes in polarized optical systems.

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.

For proper functioning, the incoming light should be one of the following:

– natural light

– circularly polarized

– 45° linearly polarized

This means that the s-polarized and p-polarized components should be roughly equal to each other in intensity. The outgoing beams are two partially polarized beams of approximately equal intensities.

SpecificationAvailable Quality
Range of dimensions0.8mm-100mm
Range of splitting ratios10/90 (R/T*) to 90/10 (R/T)
Highest 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)

*: T=(Ts+Tp)/2, R=(Rs+Rp)/2

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