Birefringent filter with amplitude beats |
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Authors: | Ignacio Moreno Pablo Velásquez Daniel Puerto Asticio Vargas |
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Institution: | a Departamento de Ciencia y Tecnología de Materiales, Universidad Miguel Hernández, Avda, Ferrocarril s/n, 03202 Elche, Spain b Instituto de Bioingeniería, Universidad Miguel Hernández, 03202 Elche, Spain c Departamento de Física y Arquitectura de Computadores, Universidad Miguel Hernández, 03202 Elche, Spain d Departamento de Ciencias Físicas, Universidad de La Frontera, Chile |
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Abstract: | In this work, we show a very simple birefringent filter useful to modulate a broadband light spectrum. We first show the generation of various oscillating spectra using two identical multiple-order waveplates. In particular a sinusoidal broadband spectrum with a rapid oscillation is obtained. This spectrum is amplitude modulated by adding another waveplate to the system. This waveplate has a small phase shift, and with the proper orientation generates amplitude beats on the broadband spectrum. Finally, we show how this system can be voltage controlled by means of a ferroelectric liquid crystal modulator. We experimentally demonstrate this behavior with the aid of a portable spectrophotometer, and we provide a theoretical explanation on the basis of the Jones matrix formalism. |
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Keywords: | 45 25 Ja 45 25 Lc 42 70 Df 42 79 Kr |
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