Plate beam splitter consists of thin window. When using it, the two partial beams travel different optical paths. And the optical paths are decided on the thickness of plates and the incident angle. Beamsplitter plates can be used with high power lasers. When using beamsplitter plates, it is important to bear in mind that the two partial beams travel different optical paths. The optical paths depend on the incident angle and the thickness of the plates.
| ATTRIBUTE | SPECIFICATIONS |
| material | N-BK7 or Specified |
| DIAMETER TOLERANCE | +0.1, -0.1mm |
| thickness | +0.1, -0.1mm |
| parallelism | < 3 arc minutes |
| CLEAR APERTURE | >90% |
| flatness | λ/4@632.8nm |
| SURFACE QUALITY | 40/20 scratch and dig |
| t/r | T=(Ts+Tp)/2, R=(Rs+Rp)/2 |
| BEVEL | < 0.2 mm x 45° |
| COATING | Beamsplitter coating on one surface and AR coating on the other |
