The 10B20NP.23 Laser Line Non-Polarizing Beamsplitter is insensitive to the polarization of an incoming beam. Unlike broadband dielectric beamsplitters, which are extremely polarization sensitive, this beamsplitter provides a true 50/50 split regardless of the incoming polarization. The polarization components are matched to within 5%. Near zero absorption in these dielectric beamsplitters results in true 50/50 split of the beam and high damage threshold. They are especially useful for higher power applications where cemented cube beamsplitters may fail. This 25.4 mm diameter beamsplitter is manufactured using a high-precision BK 7 substrate to minimize wavefront distortion. A slight wedge in the substrate helps eliminate back reflections to the laser. The front surface is coated with a multilayer all-dielectric non-polarizing beamsplitter coating optimized for 514.5 nm. The back surface is coated with a multilayer dielectric antireflection coating to minimize surface reflection losses and eliminate ghost images.
| Model | 10B20NP.23 |
|---|---|
| Shape | Spherical |
| Type | Laser Line Beamsplitter |
| Material | Grade A BK7 |
| Diameter | 1.0 in. (25.4 mm) |
| Thickness | 0.24 in. (6.1 mm) |
| Surface Quality | 15-5 scratch-dig |
| Angle of Incidence | 45 ±3 ° |
| Diameter Tolerance | +0/-0.13 mm |
| Thickness Tolerance | ±0.38 mm |
| Wavelength | 514.5 nm |
| Wedge | 30 ±15 arc min |
| Transmission | 50 ±5%, independent of polarization |
| Wavefront Distortion | ≤λ/10 at 632.8 nm over the clear aperture |
| Polarization | S- and P-polarization components matched to within 5% |
| Orientation | Beam should enter surface marked with an arrow |
| Chamfers | 0.5 mm face width |
| Chamfers Angle/Tolerance | 45° ±15° |
| Clear Aperture | >central 80% of diameter |
| Cleaning | Non-abrasive method, acetone or isopropyl alcohol on lens tissue recommended |
