An optical device as claimed in claim 6, wherein said polarizing devices each comprise a rhomboidal prism split along a median plane to provide said thin film coating, said prisms providing a back surface to redirect said split beams into a parallel arrangement.ĩ. An optical device as claimed in claim 6, wherein said polarizing devices each comprise a rectangular prism split along a diagonal to provide said thin film coating, and mirrors are provided to redirect said split beams into a parallel arrangement.Ĩ. An optical device as claimed in claim 3, wherein said polarization-rotating device is selectively operative according to its rotational state to change the plane of polarization of light passing therethrough, whereby the second polarizing device outputs said combined unpolarized output beam at said second port or a further port depending on the rotational state of said polarization-rotating device such that said optical device functions as an optical switch.ħ. An optical device as claimed in claim 3, wherein said polarization-rotating device is a Faraday rotator associated with a waveplate plate.Ħ. An optical device as claimed in claim 3, wherein said polarization-rotating device is a non-reciprocal device affecting beams travelling in opposite directions differently.ĥ. An optical device as claimed in claim 2, further comprising a polarization-rotating device in which each of said p-polarized and s-polarized beams capable of changing its plane of polarization.Ĥ. An optical device as claimed in claim 1, wherein in a first direction a first of said pair of polarizing devices splits a light beam incident at a first port into a reflected p-polarized beam and a transmitted s-polarized beam, and a second of said polarizing devices combines a p-polarized beam and a s-polarized into a combined unpolarized output beam at a second port.ģ. In an optical device for controlling the flow of light between ports, comprising a pair of polarizing devices, the improvement wherein said polarizing devices employ frustrated total internal reflection and interference in a thin film coating to reflect p-polarized light and to transmit s-polarized light.Ģ.
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