When using a beamsplitter in an optical
system it is very important that all of the light which is incident
upon the coating be either transmitted or reflected with a minimal
loss due to absorption in the coating. Unlike metal beamsplitters,
which have a large loss due to absorption, these beamsplitters
are constructed of all dielectric, low-absorption materials.
The resultant absorption is approximately 0.5% to 1.0%, depending
upon the R/T
ratio. All of the beamsplitters listed in this section are
designed for use at a 45° angle of incidence in randomly
polarized
light. Custom beamsplitters are available for specific angles
and polarization states, and will be quoted upon request. Please
contact one of our technical sales representatives for assistance.
To minimize any second surface reflections, all uncoated surfaces
are broadband anti-reflected coated. All coatings are hard and
durable, and will meet or exceed the following environmental
specifications:
| General Specifications |
| Substrate Material: |
Schott® BK-7 |
| Thickness: |
3mm ±0.5mm |
| O.D. Tolerance: |
+0.00/-0.25mm |
| Coating Quality: |
60/40 Per MIL-O-13830B |
| Surface Quality: |
80/50 Per MIL-M-13508 |
| Humidity and
Abrasion: |
Per MIL-STD-810C |
| Max Operating
Temp: |
+100°C |
| Flatness: |
1 wave per 25mm
or better |
| Parallelism: |
3 arc minutes or
better |
| Angle of incidence |
45° random polarization |
| Min. Clear Aperture |
85% of Ø |
|
