Pellicle Beamsplitters
- No change in optical path length between reflected and transmitted light
- Pellicles eliminate second surface reflections
- Available in 1, 2 and 4 inch clear apertures
- Thickness uniformity is held to 2 waves per inch
Pellicles are thin nitrocellulose films which are stretched over a metal frame. Since they are less than 2 microns thick the reflected beams from both surfaces are essentially superimposed upon each other. Uncoated pellicles reflect 10% of the incident light when used at 45 degrees, thus providing a useful, low-intensity side beam. These pellicles can also be coated with various thin films in order to change the reflectivity and provide for a range of useful splitting ratios.
The pellicles are offered in three sizes 1 inch, 2 inch, 4 inch clear aperture.
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| Frame Diameter (mm) | Frame Thickness (mm) | Aperture (mm) | Split Ratio R:T | Surface Quality | Frame Diameter tolerance | Frame Thickness tolerance | Thickness Uniformity | Frame Material | Temperature Range | Material |
|---|---|---|---|---|---|---|---|---|---|---|
| 34.9 | 4.8 | 25.4 | 10:90 | 40 - 20 | +0, -0.5mm | ±0.1mm | 2λ/inch | Balck Anodized Aluminum | -40C to 150C | Nitrocellulose: nominal index 1.5 |
| 63.5 | 6.4 | 50.8 | 10:90 | 40 - 20 | +0, -0.5mm | ±0.1mm | 2λ/inch | Balck Anodized Aluminum | -40C to 150C | Nitrocellulose: nominal index 1.5 |
| 114.3 | 6.4 | 101.6 | 10:90 | 40 - 20 | +0, -0.5mm | ±0.1mm | 2λ/inch | Balck Anodized Aluminum | -40C to 150C | Nitrocellulose: nominal index 1.5 |
| 34.9 | 4.8 | 25.4 | 50:50 | 40 - 20 | +0, -0.5mm | ±0.1mm | 2λ/inch | Balck Anodized Aluminum | -40C to 150C | Nitrocellulose: nominal index 1.5 |
| 63.5 | 6.4 | 50.8 | 50:50 | 40 - 20 | +0, -0.5mm | ±0.1mm | 2λ/inch | Balck Anodized Aluminum | -40C to 150C | Nitrocellulose: nominal index 1.5 |
| 114.3 | 6.4 | 101.6 | 50:50 | 40 - 20 | +0, -0.5mm | ±0.1mm | 2λ/inch | Balck Anodized Aluminum | -40C to 150C | Nitrocellulose: nominal index 1.5 |
| 34.9 | 4.8 | 25.4 | 33:67 | 40 - 20 | +0, -0.5mm | ±0.1mm | 2λ/inch | Balck Anodized Aluminum | -40C to 150C | Nitrocellulose: nominal index 1.5 |
| 63.5 | 6.4 | 50.8 | 33:67 | 40 - 20 | +0, -0.5mm | ±0.1mm | 2λ/inch | Balck Anodized Aluminum | -40C to 150C | Nitrocellulose: nominal index 1.5 |
| 114.3 | 6.4 | 101.6 | 33:67 | 40 - 20 | +0, -0.5mm | ±0.1mm | 2λ/inch | Balck Anodized Aluminum | -40C to 150C | Nitrocellulose: nominal index 1.5 |
| 34.9 | 4.8 | 25.4 | 40:40 | 40 - 20 | +0, -0.5mm | ±0.1mm | 2λ/inch | Balck Anodized Aluminum | -40C to 150C | Nitrocellulose: nominal index 1.5 |