Abstract

The design and construction of a hexagonal interferometer beam splitting prism is described in which the light falls onto the all-dielectric partially reflecting coating at an angle of 30° with respect to the normal. For a beam that undergoes one transmission and one reflection by the device, the average effective transmittance ½(T^‖R^‖ +T^⊥R^⊥) in the 0.55–0.75-μm spectral region is ∼0.23. This quantity is not strongly dependent on the plane of polarization of the incident light, nor on small changes of the angle of incidence from the design angle of 30°. Ways to improve further the performance of the beam splitter are indicated. Coating designs for other angles of incidence are also given.

© 1985 Optical Society of America

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