Optical: systems and elements – Polarization without modulation – Polarizarion by dichroism
Patent
1993-12-03
1997-08-12
Shafer, Ricky D.
Optical: systems and elements
Polarization without modulation
Polarizarion by dichroism
359488, 359583, 359589, 359834, G02B 530, G02B 2728
Patent
active
056571607
ABSTRACT:
A polarization plane rotator, for executing rotation of the plane of polarization of linearly polarized light that is incident thereon with a predetermined angle of incidence, is formed of a transparent prism or an array of such prisms, each prism having a triangular cross-sectional shape, with first, second and third surfaces having respective lines of intersection that are mutually parallel. The linearly polarized light is incident on the first surface, to be reflected twice in succession at the second and third surfaces, to be emitted from the first surface with the plane of polarization rotated by 90.degree. and the direction of propagation altered. An optical thin film is formed on the second and third surfaces, for substantially reducing an amount of phase difference between the P and S polarization components which results from reflection, thereby ensuring that the emitted light is substantially completely linearly polarized. The polarization plane rotator can be combined with a polarizing beam splitter to form a polarization converter to implement a polarized light source having very high efficiency, suitable for use in a projection display system employing a polarization-dependent light valve.
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"Principles of Optics", Max Born et al., pp. 46-50, 1959.
Miyatake Yoshito
Sannohe Shinya
Matsushita Electric - Industrial Co., Ltd.
Shafer Ricky D.
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