INVESTIGATION OF LIQUID CRYSTAL TUNABLE FILTERS FOR NEAR-INFRARED SCANNING

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Authors
  1. LaRochelle, S.
  2. Dubois, J.
Corporate Authors
Defence Research Establishment Valcartier, Valcartier QUE (CAN)
Abstract
Narrowband tunable optical filters can be used to reduce the background induced noise in laser detectors covering near-infrared wavelengths. This memorandum presents a review of classical birefringent filters that could be made using tunable liquid crystal elements. The relationships between the number of elements, the optical bandwidth and the free spectral range are presented. Calculations of the transmission of an ideal filter are presented for several different designs and the required tuning of optical path difference of each element is considered. A two-element filter assembly made of a liquid crystal filled Fabry-Perot and a single element Lyot Filter is proposed as the first step to explore this technology.
Keywords
Fabry-Perot scanning interferometers;Lyot filters;Liquid Crystal Tunable Filters (LCTF)
Report Number
DREV-TM-9605 — Technical Memorandum
Date of publication
01 Aug 1996
Number of Pages
15
DSTKIM No
96-02541
CANDIS No
499195
Format(s):
Document Image stored on Optical Disk;Hardcopy

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