6533b7ddfe1ef96bd1273627

RESEARCH PRODUCT

Optical System For Measuring The Spectral Retardance Function In An Extended Range

Pascuala García-martínezMaría Del Mar Sánchez-lópezAsticio VargasAbdelghafour MessaadiIgnacio Moreno

subject

BirefringenceMaterials sciencebusiness.industryNear-infrared spectroscopy02 engineering and technologyPolarizerPhysics::Classical PhysicsPolarization (waves)01 natural sciencesAtomic and Molecular Physics and OpticsSpectral linelaw.invention010309 opticsWavelength020210 optoelectronics & photonicsOpticsAchromatic lenslaw0103 physical sciences0202 electrical engineering electronic engineering information engineeringSpectroscopybusiness

description

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. 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. 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. 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.

yearjournalcountryeditionlanguage
2016-11-09
10.1186/s41476-016-0023-7