issue date:2016-3-31 15:35:44 visit frequency:3051
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 |
|
Tp>95% |
||
Principal Reflectance |
Rs>99% |
|
Coatings |
Polarization beamsplitter coating on hypotenuse face, pAR-coatings(R<0.25%) on all unput and output face |