Polarization-independent trap detectors, in which light is strongly absorbed through multiple reflections, are generically described in terms of the symmetry planes of a cube. The detailed design of a four-element transmission trap with coaxial input and output beams is presented. It is shown that such a trap retains polarization-dependent loss and that six detectors are required for a polarization independent transmission trap with coaxial beams.
© 1994 Optical Society of America
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