Spectral characterization and tuning with liquid-crystal retarders

María del Mar Sánchez-López; Ignacio Moreno; Asticio Vargas; Pascuala García-Martínez

doi:10.1117/12.2188629

9 September 2015 Spectral characterization and tuning with liquid-crystal retarders

María del Mar Sánchez-López, Ignacio Moreno, Asticio Vargas, Pascuala García-Martínez

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Proceedings Volume 9598, Optics and Photonics for Information Processing IX; 95980E (2015) https://doi.org/10.1117/12.2188629
Event: SPIE Optical Engineering + Applications, 2015, San Diego, California, United States

Abstract

An accurate characterization of the retardance function of liquid-crystal retarders (LCR) is essential for a proper use of instruments that include these devices. In this paper a simple technique to characterize the retardance of a LCR, both as a function of wavelength and applied voltage, is presented. With the proposed analysis we can describe the spectral modulation properties of the device using few parameters. The method is then extended to the case of non-normal incidence, thus allowing to distinguish between the extraordinary and ordinary axes. The accounting of Fabry-Perot interference effects are used to obtain a very accurate determination of the spectral phase shifts. Finally, such a full characterization of the LCR retardance is applied to a liquid-crystal spatial light modulator and an optical architecture is designed where the spectral content of the light beam can be engineered at will.

Citation Download Citation

María del Mar Sánchez-López, Ignacio Moreno, Asticio Vargas, and Pascuala García-Martínez "Spectral characterization and tuning with liquid-crystal retarders", Proc. SPIE 9598, Optics and Photonics for Information Processing IX, 95980E (9 September 2015); https://doi.org/10.1117/12.2188629

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KEYWORDS

Wave plates

Polarizers

Liquid crystals

Phase shifts

Modulation

Fabry–Perot interferometers

Polarization

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