Liquid crystal cells – elements and systems – Liquid crystal optical element – Liquid crystal diffraction element
Reexamination Certificate
2004-09-21
2009-02-17
Lee, Hwa (Andrew) S (Department: 2886)
Liquid crystal cells, elements and systems
Liquid crystal optical element
Liquid crystal diffraction element
Reexamination Certificate
active
07492439
ABSTRACT:
Liquid crystal point diffraction interferometer (LCPDI) systems that can provide real-time, phase-shifting interferograms that are useful in the characterization of static optical properties (wavefront aberrations, lensing, or wedge) in optical elements or dynamic, time-resolved events (temperature fluctuations and gradients, motion) in physical systems use improved LCPDI cells that employ a “structured” substrate or substrates in which the structural features are produced by thin film deposition or photo resist processing to provide a diffractive element that is an integral part of the cell substrate(s). The LC material used in the device may be doped with a “contrast-compensated” mixture of positive and negative dichroic dyes.
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Marshall, K. et al., Recent advances in the development of phase-shifting liquid crystal interferometers for visible and near-IR applications, Proceedings of SPIE vol. 5188 Advanced Characterization Techniques for Optics, Semiconductors, and Nanotechnologies, pp. 48-60, Aug. 3-5, 2003.
Lee Hwa (Andrew) S
Lukacher Kenneth J.
Lukacher Martin
The University of Rochester
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