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Beam coupling in nanotube-doped nematic liquid-crystal films

Wei Lee, Sheng-Long Yeh, Chih-Chao Chang, and Chien-Chih Lee

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Abstract

Diffraction gratings written in films of nematic liquid crystals doped with multiwall carbon nanotubes were investigated by measurements of exponential beam-coupling coefficients. These phase gratings were induced by the interference modulation of two coherent optical beams, in conjunction with an externally applied dc field. Systematic and consistent results of the gain properties indicate that the observed coherent-beam amplification depends strongly on the pump-to-probe intensity ratio.

©2001 Optical Society of America

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Figures (4)
Fig. 1.
Fig. 1. Energy exchange between two incident beams of 45 mW at V dc=3 V.

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Fig. 2.
Fig. 2. Net exponential gain coefficient of the 1-mW probe beam as a function of the applied voltage. The incident pump-beam power is fixed at ◈ 60 mW, ● 100 mW, △ 140 mW, and ▼ 200 mW.

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Fig. 3.
Fig. 3. Voltage dependence of the gain coefficient for the 5-mW probe beam coupled with the input pump beam of various powers: ◈25 mW, ●75 mW, △125 mW, and ▼175 mW.

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Fig. 4.
Fig. 4. Comparison between different total writing powers of identical pump-to-probe ratio. The incident pump and probe powers are ◈ 20 and 1 mW, ● 100 and 5 mW, △ 40 and 1 mW, and ▼ 200 and 5 mW, respectively.

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Equations (1)

Equations on this page are rendered with MathJax. Learn more.

Γ = ln [ g m / ( m − g + 1 ) ] / L − α ,
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