Polarization beam splitter and combiner
First Claim
Patent Images
1. A polarization beam splitter comprising:
- a first prism including a first surface on which light is incident and a second surface that makes an acute angle with the first surface;
a second prism disposed so as to face the second surface of the first prism;
a multilayer birefringent stack adjacent to the second surface of the first prism; and
a dichroic coating between the multilayer birefringent stack and the second prism.
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Abstract
A polarization beam splitter (PBS) and combiner includes a multilayer birefringent stack adjacent to a dichroic coating, sandwiched between glass prisms. This configuration overcomes the reflected wave distortion associated with a conventional multilayer birefringent cube PBS while maintaining excellent polarization performance. An exemplary application of the PBS and combiner is in a four-port LCOS imaging system. LCOS projection architectures based on the PBS are also disclosed.
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Citations
20 Claims
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1. A polarization beam splitter comprising:
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a first prism including a first surface on which light is incident and a second surface that makes an acute angle with the first surface;
a second prism disposed so as to face the second surface of the first prism;
a multilayer birefringent stack adjacent to the second surface of the first prism; and
a dichroic coating between the multilayer birefringent stack and the second prism. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A polarization beam splitter (PBS) having an optical interface for selectively reflecting and transmitting polarized light, the optical interface comprising:
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a multi layer birefringent stack; and
a dichroic coating adjacent to the multilayer birefringent stack, wherein the multilayer birefringent stack is operable to reflect incident s-polarized light toward a first direction and transmit incident p-polarized light toward a second direction, wherein the dichroic coating is operable to reflect s-polarized light toward a third direction. - View Dependent Claims (14, 15)
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16. A projection system, comprising:
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a first polarization beam splitter (PBS) having an optical interface comprising;
a multilayer birefringent stack, and a dichroic coating adjacent to the multilayer birefringent stack;
a second PBS; and
a third PBS operable to combine light from the first PBS and the second PBS, and operable to output the combined light through an output port. - View Dependent Claims (17, 18, 19, 20)
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Specification