Interference birefringent filters fabricated with low cost commercial polymers

Velásquez, Pablo; Sánchez-López, Marı́a del Mar; Moreno, Ignacio; Puerto, D.; Mateos, F. Valenzuela

doi:10.1119/1.1834920

Cited by 41 publications

(28 citation statements)

References 13 publications

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“…The zero intensity transmission indicates that the incident polarization state is parallel to one of the neutral axes of the device. The relative intensity transmittance (i) of a wave-plate in between two crossed polarizers is given by the following relation [14]:…”

Section: Calibration Of the Phase Shift Spectral Dependencementioning

confidence: 99%

Optimization of optical switching with a ferroelectric liquid crystal modulator

Sánchez-López

García‐Martínez

Velásquez

2007

Optics and Photonics for Information Processing

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In this work we present a simple method for the characterization of a ferroelectric liquid crystal (FLC) optical modulator and the optimization of its contrast ratio. This device acts as switchable wave-plate, where the orientation of the principal axes rotates under the action of an applied bipolar voltage. It is designed to produce a binary intensity modulation when the phase shift introduced between the principal axes is equal to 180 degrees (half wave-plate). We present a simple technique to optimize its response when the phase shift differs from this ideal value, in order to produce a highly contrasted intensity modulation. The technique involves using elliptically polarized light and requires the use of an additional quarter wave-plate in front of the FLC modulator. We represent the polarization transformations on the Poincaré sphere to provide a physical explanation of the FLC optical performance, both in the standard operational mode as well as in the optimized configuration for non-ideal phase shifts. These situations are experimentally demonstrated using a commercially available ferroelectric liquid crystal cell and two He-Ne lasers with wavelengths of 543 nm and 633 nm respectively.

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Section: Calibration Of the Phase Shift Spectral Dependencementioning

confidence: 99%

Optimization of optical switching with a ferroelectric liquid crystal modulator

Sánchez-López

García‐Martínez

Velásquez

2007

Optics and Photonics for Information Processing

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“…11 The Solc filter waveplate arrangement is shown in Fig. It is possible to produce an approximate flattop response using three waveplates whose thicknesses are in the ratio ͑d ,2d ,2d͒ and whose orientations relative to the polarizer are ͑45°, −15°, 10°͒.…”

Section: A Solc Waveplatesmentioning

confidence: 99%

Imaging interferometers for analysis of Thomson scattered spectra

Howard

Hatae

2008

Review of Scientific Instruments

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Polarization interferometers have some potential efficiency advantages for imaging Thomson scattering spectral analysis. In this article we present a number of designs for high-efficiency imaging polarization interferometers for Thomson scattering spectral analysis. The use of high-efficiency crystal polarizing beamsplitters (both displacement and angle) results in low-loss complementary passbands (no edge losses), simple imaging systems, and wide field of view. The efficiency and relative merits of both multiple-filter and dispersive-type configurations are being assessed before installation on the JT-60U ruby-laser Thomson scattering system. Light is transferred from the viewing port via a linear array of optical fiber bundles which will be imaged through the interferometer onto the photocathode of an intensified charge coupled device camera. Because of the broadband nature of the Thomson light, the optical delays required to Fourier analyze the spectrum are quite small. This leads to compact multicolor or dispersive systems based on combinations of Wollaston and Savart splitters and traditional waveplates.

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“…The retarder is inserted between two parallel or crossed linear polarizers, with the principal c-axis oriented with a relative angle of 45°with respect the transmission axes of the polarizers. In this situation, the normalized transmission output is given by [4]:…”

Section: Methodsmentioning

confidence: 99%

“…However, characterization of their spectral retardance properties can be very valuable for several reasons: 1) the retarder can be used at wavelengths different to the original design; 2) the retarder can be applied to build spectral birefringent filters, which are based on the wavelength variation of the retardance [4], 3) it allows the simple identification of the ordinary and extraordinary neutral axes of the retarder [5], and 4) the retardance modulation of tunable LC retarders can be characterized [6,7].…”

Section: Introductionmentioning

confidence: 99%

Optical system for measuring the spectral retardance function in an extended range

Messaadi

Sánchez-López

García‐Martínez

et al. 2016

J. Eur. Opt. Soc.-Rapid Publ.

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Background: Optical retarders are key elements for the control of the state of polarization of light, and their wavelength dependance is of great importance in a number of applications. Methods: We apply a well-known technique for determinig the spectral retardance by measuring the transmission spectra between crossed or parallel polarizers. But we we develop an optical system to perform this measurement in a wide spectral range covering the visible (VIS) and near infrared (NIR) spectrum in the range from 400 to 1600 nm. Results: As a result we can measure the spectral retardance of different retarders and easily identify the kind of reterder (multiple order, zero-order, achromatic). We show results with tunable liquid-crystal retarders as well, where the technique is applied to determine the spectral retardance as a function of the applied voltage. Finally, the accuracy of the technique is verified by the generation of a birefringent spectral filter. Conclusions: A technique to measure the spectral retardance of a linear retarder in a wide spectral range is applied to identify different types of retarders, and provide an accurate description of the spectral polarization conversion properties of these elements.

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Interference birefringent filters fabricated with low cost commercial polymers

Cited by 41 publications

References 13 publications

Optimization of optical switching with a ferroelectric liquid crystal modulator

Optimization of optical switching with a ferroelectric liquid crystal modulator

Imaging interferometers for analysis of Thomson scattered spectra

Optical system for measuring the spectral retardance function in an extended range

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