Open AccessThree-stage Fabry–Perot liquid crystal tunable filter with extended spectral range
Author(s) -
Zhenrong Zheng,
Guowei Yang,
Haifeng Li,
Lu Xu
Publication year - 2011
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.19.002158
Subject(s) - fabry–pérot interferometer , free spectral range , optics , liquid crystal tunable filter , materials science , filter (signal processing) , optical filter , range (aeronautics) , spectral line , optoelectronics , liquid crystal , physics , wavelength , computer science , astronomy , composite material , computer vision
A method to extend spectral range of tunable optical filter is proposed in this paper. Two same tunable Fabry-Perot filters and an additional tunable filter with different free spectral range are cascaded to extend spectral range and reduce sidelobes. Over 400 nm of free spectral range and 4 nm of full width at half maximum of the filter were achieved. Design procedure and simulation are described in detail. An experimental 3-stage tunable Fabry-Perot filter with visible and infrared spectra is demonstrated. The experimental results and the theoretical analysis are presented in detail to verify this method. The results revealed that a compact and extended tunable spectral range of Fabry-Perot filter can be easily attainable by this method.