Electrically Tunable Fabry-Perot Spectral Filter

Award Information
Agency: Department of Defense
Branch: Air Force
Contract: N/A
Agency Tracking Number: 20023
Amount: $50,852.00
Phase: Phase I
Program: SBIR
Awards Year: 1993
Solicitation Year: N/A
Solicitation Topic Code: N/A
Solicitation Number: N/A
Small Business Information
Cambridge Research &
21 Erie Street, Cambridge, MA, 02139
DUNS: N/A
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Peter Miller
 (617) 491-2627
Business Contact
Phone: () -
Research Institution
N/A
Abstract
Frequency-agile Fabry-Perot etalons have been built using the electro-optic actin of nematic and ferro-electric liquid crystals to tune the pass wavelength. Also, techniques exist for constructing liquid crystall elements in 1-D and 2-D arrays. The combination of these technologies would yield spatially addressable, tunable spectral filter elements useful for wavelength-domain optical signal processing. These devices would be compact, rugged, and require very low drive power. However, present commercial and research etalons exhibit unacceptably low finesse (F <= 20) and poor throughput in the visible range. In Phase I, we propose to build an etalon using liquid crystal material, and to assess those factors which limit the optical performance of practical 1-D and 2-D arrays in the visible and near-IR. Also, reliable spectral tuning and characterization of the array elements ot __/100 or better must also be demonstrated. Other concerns include the well-known thermal bowing of liquid crystal cells, and temperature effects of the liquid crystal tuning. These performance-limiting factors will be studied, and approaches developed for implementation in Phase II. We will also characterize the etalon's finess, transmission, extinction, useful spectral range, and response time, when filled with various liquid crystal materials to determine how liquid crystal paramaters (delta-n, ___, k33, Tc) affect overall performance, and to allow use of optimum materials.

* information listed above is at the time of submission.

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