Field-assisted fiber spinning for the preparation of optical fib

Details Field-assisted fiber spinning for the preparation of optical fib Field-assisted fiber spinning for the preparation of optical fib

1987-09-18

1990-04-17

Sikes, William L.

350 9629, 350 9630, G02B 600, G02B 610

Patent

active

049174550

ABSTRACT:
A method for the preparation of polymer-based optical fibers with nonlinear optical activity using a field-assisted fiber spinning technique has been developed. A homogeneous mixture of high-glass-transition-temperature polymer and a rigid-rodlike noncentrosymmetric molecule with nonlinear optical activity is employed in a specialized fiber-spinning operation. Equivalently, the noncentrosymmetric moieties can be chemically attached to the polymer backbone. A special spinneret is designed in such a manner as to allow a strong electric or magnetic field to be externally applied in the die (extrudate) swell region prior to fiber draw-down. In the die swell region, the imposed electric or magnetic field imparts a preferential orientation to the rod-like molecules (segments), where the molecular dipoles acquire an anistropic spatial orientational accentuated and trapped in fiber draw-down, where the mixture cools and vitrifies. Hence, the final product is nonlinearly-active polymer optical fibers doped with non-centrosymmetric rod-like molecules (segments) whose molecular axis is aligned with the fiber axis. In addition, the alignment is such that the net dipole moment of the system as a whole is non-zero due to the strong electromagnetic field imposed prior to fiber draw-down. This invention is useful in a wide variety of electro-optic and opto-electronic applications.

REFERENCES:
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"Angewandte Chemie", vol. 23, No. 9, pp. 690-703, Sep. 1984.
"Nonlinear Optical Properties of Organic and Polymeric Materials", Ed-D. J. Williams, ACS Symposium Series 233, American.
R. J. Twieg and K. Jain in "Nonlinear Optical Properties of Organic and Polymeric Materials".
D. J. Williams, ed.-, ACS Symposium Series 233, American Chemical Society, Washington, D.C., 1983, p. 57.
Chemical Society, Washington, D.C., 1983, p. 57.
K. D. Singer, J. E. Sohn, and S. J. Lalama, Appl. Phys. Lett., 49, 248 (1986).
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