CRYLINK’s grid polarization beam splitting cube consists of parallel metal wire arrays sandwiched between two N-BK7 prisms. The grid polarizer transmits the radiation of electric field vector perpendicular to the metal wire, and reflects the radiation of electric field vector parallel to the metal wire. The cube separates the s-polarization component from the p-polarization component by reflecting the s-polarization component at the wire grid and allowing the p-polarization component to pass through. Due to the surface reflection, the reflected light contains two kinds of polarization.
The AOI of the beam splitting cube is larger than that of the conventional broadband polarization beam splitting cube. In order to obtain the highest polarization extinction ratio, use the transmitted beam to provide TP: TS > 1000:1 extinction ratio for AOI from 0 ° to 5 °. For higher AOI (5 ° to 25 °), this cube can maintain the extinction ratio of TP: TS > 100:1.
The grid is sandwiched between the beveled edges of the two prisms that make up the cube. Next, the two semi prisms are bonded together with an optical adhesive (see above). Light can be input into any polished surface to separate s-polarization and p-polarization. However, for optimum performance, light should enter through an incident plane of the coated prism, which is indicated by a dot.
The beam splitting cube is coated with antireflective coatings from 400 nm to 700 nm (ravg < 0.5% at 0 ° incident angle).
|Design wavelength||400 – 700 nm|
|AR Coating||Ravg < 0.5% @ 0° AOI for 400 – 700 nm|
|Extinction ratio||Tp:Ts > 1000:1 @ 0° – 5° AOI|
Tp:Ts > 100:1 @ 0° – 25° AOI
|transmission||Tp > 75% (Avg.) @ 0° AOI for |
400 – 700 nm
|reflection||Rs > 70% @ 0° – 25° AOI for |
400 – 700 nm
|Transmitted Beam Deviation||< 5 arcmin|
|Reflected Beam Deviation||90° ± 5 arcmin|
|Clear Apertureb||>22.9 mm x 22.9 mm|
|Transmitted Wavefront Error||< λ/4 @ 633 nm|
|Surface Quality||40-20 Scratch-Dig|
(L = W = H)
|1″ (25.4 mm)|
|Dimensional Tolerance||+0.00 mm / -0.25 mm|
- Transmitted p-polarized light and reflected s-polarized light
- 1-inch uninstalled polarization beam splitting cube
- Large field of view
- High extinction ratio