| Standard Specifications |
| Material: |
BK7 grade A, fused silica |
| Dimensional Tolerance: |
+ 0.0/- 0.2mm |
| Wavefront Distortion: |
l/4 at 632.8nm |
| Surface Quality: |
40-20 scratch-dig |
| Clear Aperture: |
90% central |
| Transmission: |
50% ± 5%; independent of polarization
|Ts-Tp| < 5% |
| Reflection: |
50% ± 5%; independent of polarization
|Rs-Rp| < 5% |
| Beam Deviation: |
± 5 arc minutes for transmitted
± 5 arc minutes for reflected |
| Angle of Incidence: |
± 2o |
| AR coating: |
R < 0.25% |
| Temperature Range: |
-40oC to 100oC |
| Damage Threshold: |
2kW/cm2CW, 1J/cm2 with 10 ns |
