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Polarizing Beamsplitter Cubes

issue date:2016-3-31 15:35:44 visit frequency:1345

Polarizing Beamsplitter Cubes

A polarizing cube beamsplitter consists of a pair of right angle prisms cemented together. The hypotenuse face of one prism is coated with a special multilayer dielectric coating. When non-polarized light is normally incident upon the entrance face, it is separated into two polarized beams, emerging through two adjacent faces in perpendicular directions and polarized orthogonally to each other. The transmitted beam is p-polarized while the reflected beam is s-polarized. When linearly polarized light is incident, it is similarly divided into two beams in a ratio depending upon the orientation of the polarization of the incident light beam. These polarizing beamsplitters are available for many common laser wavelengths and broadband ranges.


Material

N-SF1 or others

Dimension Tolerance

+0/-0.2mm

Flatness

λ/4 @ 632.8 nm

Surface Quality

40/20 scratches and dig

Extinction Ratio

Tp:Ts>1,500:1(VIS)  2,000:1(NIR)

Acceptance Angle

+/-5 deg

Transmitted Beam Deviation

<5 arc min

Reflected Beam Deviation

90 deg +/-5 arc min

Wavefront Distortion

Lambda/4@632.8nm

PrincipalTransmittance

Tp>95%

Principal Reflectance

Rs>99%

Coatings

Polarization beamsplitter coating on hypotenuse face,

pAR-coatings(R<0.25%) on all unput and output face