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Knight Optical(UK) Ltd - - +44 (0)1622 859444

Polarising cube beamsplitters

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Polarising cube beamsplitters are designed to split incident light into its polarised components rather than by simple transmission and reflection. The cube allows P-polarised light to pass undeviated through the cube while S-polarised light is reflected at 90°. The quality of the cube is typically defined by the extent and accurate beam deviation of the transmitted and reflected polarised light and by the extinction ratio of the cube. Like standard non-polarising cubes, the outside faces are usually AR coated over the operating wavelength to reduce losses due to reflection.

Polarised beamsplitting cubes are manufactured by optically cementing two precision right angled prisms together along the hypotenuse length. The interior surface is dielectrically coated and controls the splitting characteristics of the optic.

Typical applications include use alongside wave plates. The half wave plate can be rotated which will in turn rotate the plane of polarisation of the light falling onto the cube. The splitter ratio of the cube will therefore depend on the rotation angle of the wave plate. This can be used to balance two beams, for example in an interferometer, or as a variable attenuator.

Knight Optical offers an extensive, cost effective custom beamsplitter cube service to supply the very highest quality products manufactured to your specification. We have many years of experience in this field and are an established supplier of custom beamsplitter cubes to industries worldwide. Speak to our experienced technical sales advisors to discuss your custom product and for advice on selecting the best product for your application.

Standard polarising type:

Standard range polarising beamsplitter cubes are designed as a cost effective solution to most common polarisation applications. Polarised cubes are suitable where the control needs to be maintained over the S and P polarisation of the optics inside a system. This includes applications where two polarisation dependent components are tested simultaneously. Standard range polarised beamsplitter cubes are manufactured with narrow bandwidths to suit clearly defined specifications such as individual laser wavelengths. If you are unsure about the polarisation requirements of your system our technical sales team will be happy to offer advice.

Broadband polarising type:

Broadband polarising beamsplitter cubes share similarities with the standard range, the key difference being the broad bandwidth over which the cube can operate. This makes broadband polarising cubes ideal for general UV, VIS and NIR use as well as polarisation dependant telecoms applications and are less restricted to individual applications. The transmitted and reflected polarised light is maintained at a constant level over the operating wavelength.

High power polarising type:

Knight Optical’s range of polarising high energy laser line beamsplitter cubes are designed for key laser applications in the visible and NIR spectrums and offer a superior laser damage threshold for high power systems. These beamsplitters operate in the same way as the standard type but are typically designed with precision tolerances and high laser damage thresholds.

These cube beamsplitters are not available as a stock item. Knight Optical supply precision, custom cube beamsplitters to industries worldwide. Please see our capabilities in the link above or contact our technical sales team for more information.

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