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X-Cube Prisms, Three-port, 10 to 50 mm, S or P Polarization

  • RGB X-cube in separation arrangement
  • RGB X-cube layout showing coated faces
Send your specification to sales@alt-vision.com
1.00 LBS
Typically 8-12 weeks

Product Description

What is an X-Cube Prism?

An x-cube prism is a glass cube beamsplitter with coatings on both diagonals. Most cube beamsplitters have a coating on only one diagonal so that part of the incoming illumination passes straight through and part is diverted to one of the side faces. These beamsplitters are made of two right-angle prisms joined at their bases. One of these faces is coated.

X-cubes are made from four right-angle prisms bonded on both sides adjacent to the right angle. Both faces of each prism are coated. With the coatings arranged so that two continuous coatings make up the two diagonals.

Why Coat Both Diagonals?

With both diagonals coated, light can be directed to all four faces. In the prism above, the left diagonal is coated to reflect blue light and the right diagonal is coated to reflect red light. The result is that when white light is projected into the face identified by the dot, the blue goes left, the red goes right and the leftover green goes straight through.

Alternatively, red, green and blue light can be projected into the appropriate faces and the output is the combination of the three.

The coatings are not limited to visible wavelengths. Any set of non-overlapping wavelengths from about 300 to 1700 nm could be used with common glasses. Other wavelengths require different materials.

X-cubes can also be built as neutral 3-channel splitters but some light returns to the input.

Cautions When Using X-Cubes

Since the internal reflectors are at 45 degrees from the input, the polarization of the incoming light will be affected. For most X-cube applications, use of S-polarized light provides the best control. If other polarizations are required, these must be specified.

The four prisms are glued together. This results is a thin vertical line in the center of the prism where unfiltered light can pass through. The width of this line is in the range of 5-10 microns depending on the size and construction of the prism. If pure colors are required, trim filters should be added at the color faces.

X-cubes are not intended for imaging. The center line can cause contrast loss and the effects of off-normal rays from typical imaging lenses would cause large spectral shifts from center to corner. In addition, the straight-through channel image would be inverted relative to the others.

Specifying X-Cubes

If an X-cube prism seems right for your illumination separating or combining application, send us an e-mail at sales@alt-vision.com so we can send you our comprehensive guide to specifying an X-cube and a sample sepcification of a real X-cube we have supplied.  

Additional Product Data

X-cude data - pdf here







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