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Tunable optical filter having a large dynamic range

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Abstract

A novel (to our knowledge) concept for a tunable birefringent filter with a high dynamic range is proposed and demonstrated by using a stack of liquid-crystal retarders having different thicknesses following an arithmetic sequence. Each retarder is between crossed polarizers with its optic axis oriented azimuthally at 45° to the polarizer axis. The tunable filter was fabricated by using nematic liquid crystals demonstrating tunability over a range of 800nm, covering the visible and the near IR; hence it has a potential for use in biomedical optical imaging applications.

© 2009 Optical Society of America

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