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Beamsplitters

Beam splitters are available in various designs such as plates, cubes and pentaprisms. Our production can manufacture almost any design.

In addition, there are three different types of beam splitter functions. These are called “unpolarized”, “non-polarizing” and “polarizing”. These are therefore differences in the way the polarization of the light to be split is handled.

If you are uncertain which beam splitter you need for your application, our short selection guide can help you or simply contact us instead. A specialist will help you make the right choice.

Unpolarized

Useful for natural, incoherent or unpolarized light. It is advised not to use these cubes in polarized optical systems.
For proper functioning, the incoming light should be one of the following:
– natural light
– circularly polarized
– 45° linearly polarized
This means that the s-polarized and p-polarized components should be roughly equal to each other in intensity. The outgoing beams are two partially polarized beams of approximately equal intensities.

Range of splitting ratios:
10/90 (R/T) to 90/10 (R/T) with T=(Ts+Tp)/2, R=(Rs+Rp)/2

Non-Polarizing

These beamsplitters have minimal polarization sensitivity. Therefore they may be used in polarized optical systems.

Due to the metallic component of the hybrid coating, these beamsplitters are not intended for use with high power lasers since they show some absorption – typically about 8%.

Non‑polarizing beamsplitters are less sensitive to changes in angle of incidence than pure dielectric unpolarized beamsplitters.

Range of splitting ratios:
50/50 (R/T) with
|Ts-Tp|<5-15%; |Rs-Rp|<5-15% dependant on bandwidth

Polarizing

These beamsplitters separate the “s” and “p” polarization components of a light beam. These two polarization components are reflected (“s”) and transmitted (“p”) respectively. Thus, both components are well separated (90°) and available for further use.

When non-polarized light is normally incident upon the entrance face, it is separated into two polarized beams, emerging through two adjacent faces in perpendicular directions and polarized orthogonally to each other.
When linearly polarized light is incident, it is similarly divided into two beams in a ratio depending upon the orientation of the polarization of the incident light beam.

Range of splitting ratios:
Typically Tp:Ts > 1000:1

Dr. Steven Wright

CUSTOMIZED SOLUTIONS

Hannes Heppner

OptiCS

Anja Weets

OPTICS

Rolf Jaspers

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