Polarizing beam combiner is composed by one Polarization Beam Splitter bonding with one half true zero order waveplate. Half waveplate converse P-polarized into S-polarized, and Polarizing beamsplitter cubes combine two polarized beams into one beam. With a dielectric coating on the hypotenuse of one of the prisms, S-polarized light is reflected at a 90 deg angle while P-polarized light is transmitted. A multi-layer antireflective coating has been applied to each outer face in order to produce maximum transmission efficiency. The bonding method is either cemented or diffusion bonding.
| ATTRIBUTE | SPECIFICATIONS |
| material | N-BK7, Fused Silica or Specified |
| DIAMETER TOLERANCE | +0.1, -0.1mm |
| flatness | Per 25.4mm λ/4 @ 632.8nm |
| CLEAR APERTURE | >90% |
| SURFACE QUALITY | 40/20 scratch and dig |
| beam deviation | <3 arc minutes |
| transmission | Tp > 95% |
| reflection | Rs > 99.5% |
| extinction ratio | 1000:1 or better |
| retardation tolerance | λ/500 |
| COATING | PBS coating on hypotenuse surface, and with AR coating on outside surfaces |
