Scattering liquid crystal in optical attenuator applications

Ari Karppinen, Harri Kopola, Risto Myllylä

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

7 Citations (Scopus)

Abstract

Several possibilities based on the principles of the scattering and polarization of light in liquid crystals and PLZT ceramics were studied for the replacement of mechanical shutters and attenuators in optical instruments. A scatter mode liquid crystal was selected as the active material, and two modules were developed for fiber optic attenuator applications. In the first, the light transmitted through an optical fiber (input fiber, (phi) 100/140 micrometers ) is collimated to a beam using a Selfoc microlens (0.25 P, (phi) 1.8 mm). This beam penetrates two LC cells (7 X 12 mm2) and is received by a Selfoc microlens at the output fiber. The second, for large-diameter fibers ((phi) 400 micrometers ), employed conventional aspherical lenses to optimize the fiber-to-fiber coupling instead of microlenses. Components were built for both (phi) 100 micrometers and (phi) 400 micrometers fibers. The maximum transmission is up to 70% and maximum contrasts 10,000:1 (632.8 nm), 3000:1 (830 nm) and 1200:1 (905 nm). The rise time is typically under 1 ms and the decay time under 5 ms, given a temperature above +20 degree(s)C. The contrast remains high from 0 degree(s)C to +50 degree(s)C. Both components function with +/- 100 VAC.
Original languageEnglish
Title of host publicationLiquid-Crystal Devices and Materials
PublisherInternational Society for Optics and Photonics SPIE
Pages179-189
DOIs
Publication statusPublished - 1991
MoE publication typeA4 Article in a conference publication
EventElectronic Imaging '91 - San Jose, United States
Duration: 1 Feb 19917 Feb 1991

Publication series

SeriesProceedings of SPIE
Volume1455
ISSN0277-786X

Conference

ConferenceElectronic Imaging '91
CountryUnited States
CitySan Jose
Period1/02/917/02/91

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attenuators
liquid crystals
fibers
micrometers
scattering
shutters
fiber optics
modules
optical fibers
lenses
ceramics
output
decay
polarization
cells

Cite this

Karppinen, A., Kopola, H., & Myllylä, R. (1991). Scattering liquid crystal in optical attenuator applications. In Liquid-Crystal Devices and Materials (pp. 179-189). International Society for Optics and Photonics SPIE. Proceedings of SPIE, Vol.. 1455 https://doi.org/10.1117/12.44690
Karppinen, Ari ; Kopola, Harri ; Myllylä, Risto. / Scattering liquid crystal in optical attenuator applications. Liquid-Crystal Devices and Materials. International Society for Optics and Photonics SPIE, 1991. pp. 179-189 (Proceedings of SPIE, Vol. 1455).
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abstract = "Several possibilities based on the principles of the scattering and polarization of light in liquid crystals and PLZT ceramics were studied for the replacement of mechanical shutters and attenuators in optical instruments. A scatter mode liquid crystal was selected as the active material, and two modules were developed for fiber optic attenuator applications. In the first, the light transmitted through an optical fiber (input fiber, (phi) 100/140 micrometers ) is collimated to a beam using a Selfoc microlens (0.25 P, (phi) 1.8 mm). This beam penetrates two LC cells (7 X 12 mm2) and is received by a Selfoc microlens at the output fiber. The second, for large-diameter fibers ((phi) 400 micrometers ), employed conventional aspherical lenses to optimize the fiber-to-fiber coupling instead of microlenses. Components were built for both (phi) 100 micrometers and (phi) 400 micrometers fibers. The maximum transmission is up to 70{\%} and maximum contrasts 10,000:1 (632.8 nm), 3000:1 (830 nm) and 1200:1 (905 nm). The rise time is typically under 1 ms and the decay time under 5 ms, given a temperature above +20 degree(s)C. The contrast remains high from 0 degree(s)C to +50 degree(s)C. Both components function with +/- 100 VAC.",
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Karppinen, A, Kopola, H & Myllylä, R 1991, Scattering liquid crystal in optical attenuator applications. in Liquid-Crystal Devices and Materials. International Society for Optics and Photonics SPIE, Proceedings of SPIE, vol. 1455, pp. 179-189, Electronic Imaging '91, San Jose, United States, 1/02/91. https://doi.org/10.1117/12.44690

Scattering liquid crystal in optical attenuator applications. / Karppinen, Ari; Kopola, Harri; Myllylä, Risto.

Liquid-Crystal Devices and Materials. International Society for Optics and Photonics SPIE, 1991. p. 179-189 (Proceedings of SPIE, Vol. 1455).

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

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N2 - Several possibilities based on the principles of the scattering and polarization of light in liquid crystals and PLZT ceramics were studied for the replacement of mechanical shutters and attenuators in optical instruments. A scatter mode liquid crystal was selected as the active material, and two modules were developed for fiber optic attenuator applications. In the first, the light transmitted through an optical fiber (input fiber, (phi) 100/140 micrometers ) is collimated to a beam using a Selfoc microlens (0.25 P, (phi) 1.8 mm). This beam penetrates two LC cells (7 X 12 mm2) and is received by a Selfoc microlens at the output fiber. The second, for large-diameter fibers ((phi) 400 micrometers ), employed conventional aspherical lenses to optimize the fiber-to-fiber coupling instead of microlenses. Components were built for both (phi) 100 micrometers and (phi) 400 micrometers fibers. The maximum transmission is up to 70% and maximum contrasts 10,000:1 (632.8 nm), 3000:1 (830 nm) and 1200:1 (905 nm). The rise time is typically under 1 ms and the decay time under 5 ms, given a temperature above +20 degree(s)C. The contrast remains high from 0 degree(s)C to +50 degree(s)C. Both components function with +/- 100 VAC.

AB - Several possibilities based on the principles of the scattering and polarization of light in liquid crystals and PLZT ceramics were studied for the replacement of mechanical shutters and attenuators in optical instruments. A scatter mode liquid crystal was selected as the active material, and two modules were developed for fiber optic attenuator applications. In the first, the light transmitted through an optical fiber (input fiber, (phi) 100/140 micrometers ) is collimated to a beam using a Selfoc microlens (0.25 P, (phi) 1.8 mm). This beam penetrates two LC cells (7 X 12 mm2) and is received by a Selfoc microlens at the output fiber. The second, for large-diameter fibers ((phi) 400 micrometers ), employed conventional aspherical lenses to optimize the fiber-to-fiber coupling instead of microlenses. Components were built for both (phi) 100 micrometers and (phi) 400 micrometers fibers. The maximum transmission is up to 70% and maximum contrasts 10,000:1 (632.8 nm), 3000:1 (830 nm) and 1200:1 (905 nm). The rise time is typically under 1 ms and the decay time under 5 ms, given a temperature above +20 degree(s)C. The contrast remains high from 0 degree(s)C to +50 degree(s)C. Both components function with +/- 100 VAC.

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Karppinen A, Kopola H, Myllylä R. Scattering liquid crystal in optical attenuator applications. In Liquid-Crystal Devices and Materials. International Society for Optics and Photonics SPIE. 1991. p. 179-189. (Proceedings of SPIE, Vol. 1455). https://doi.org/10.1117/12.44690