FIG. 04.01

Beam Splitters · Type 03 / 03
A mounted beam splitter with an adjustable split ratio.

A variable beam splitter lets you change the ratio between the transmitted and reflected beams instead of fixing it at manufacture. Supplied in a mount, it drops straight into an existing set-up. Use it to divide, combine or attenuate beams, and to balance power between two arms of an experiment.
Start from a catalogue part or from your own drawing, in the material, coating and tolerance grade you need.
| Parameter | Commercial | Precision |
|---|---|---|
| Thickness | ±0.1 mm | ±0.01 mm |
| Radius | 1% | 0.5% |
| Refractive index | 0.001 | 0.0001 |
| Abbe (V-number) | 1% | 0.1% |
| Centration | 3 arc-min | 30 arc-sec |
| Tilt / wedge | 1 arc-min | 10 arc-sec |
| Surface irregularity | 1 fringe | λ/4 (0.25 fringe) |
| Surface quality (scratch-dig) | 60-40 | 10-5 |
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