| Substrate Material: | BK7 Optical Glass | 
| Outer Diameter: | 25.4mm | 
| Thickness: | 3.0mm | 
| Tolerance: | +/-0.1mm | 
| Surface Quality: | 40/20 S/D per MIL Standard | 
| Flatness: | <Lambda/10 at 633nm over surface | 
| Parallelism: | <1 arc minute | 
| Coating Wavelength: | 400-700nm, Non-polarization coating design | 
| Angle of Incedence: | 45-deg | 
| Splitting Ratio: | R10%:T90% | 
| Splitting Ratio Tolerance: | |Ts-Tp|<15% and |Rs-Rp|<15% over 400-700nm | 
|  |  | 
| Front Surface Transmission at 45-Deg AOI:
 |  T=90% at 400-700nm (+/-5%) | 
| Front Surface Reflection at 45-Deg AOI:
 | R=10% at 400-700nm (+/-5%) | 
| Back Surface AR Coating: | Ravg<0.5% max at 400-700nm,45-deg AOI | 
| Temperature Range: | -50 to +80 deg |