Beamsplitter cube for white light interferometry

Keith B. Farr; Nicholas George

doi:10.1117/12.59886

1 October 1992 Beamsplitter cube for white light interferometry

Keith B. Farr, Nicholas George

Author Affiliations +

Optical Engineering, Vol. 31, Issue 10, (October 1992). https://doi.org/10.1117/12.59886

Abstract

Beamsplitter cubes are widely used in white light interferometers to ensure that each interferometer path is balanced with equal amounts of glass. However, commercially available beamsplitter cubes can have alignment errors and size deviations that introduce path differences into the interferometer. A technique for constructing a beamsplitter cube that has extremely well balanced paths is described. Using a tunable dye laser with rhodimine 6G, we have readily measured path differences less than 0.5 μm. By monitoring the beamsplitter path difference with the dye laser, we can adjust the path difference during assembly, thereby sliding the prisms into proper alignment on a layer of UV-cured cement.

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Keith B. Farr and Nicholas George "Beamsplitter cube for white light interferometry," Optical Engineering 31(10), (1 October 1992). https://doi.org/10.1117/12.59886

Published: 1 October 1992

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