Nonlinear optical properties of main-chain-type liquid crystalline polymers

Tadahiro Asada; Hiroyuki Tanaka

doi:10.1117/12.279260

30 October 1997 Nonlinear optical properties of main-chain-type liquid crystalline polymers

Tadahiro Asada, Hiroyuki Tanaka

Proceedings Volume 3143, Liquid Crystals; (1997) https://doi.org/10.1117/12.279260
Event: Optical Science, Engineering and Instrumentation '97, 1997, San Diego, CA, United States

Abstract

The second harmonic generations (SHG) of liquid crystalline main-chain type polymers were investigated. The sample polymers are copolymers of 2-hydroxy-6-naphthoic acid (HNA) with 4-hydroxy-benzoic acid, in various composition ratios. The SHG of the film samples was greatly affected not only by the polymerization conditions, but also by preparation conditions of the films. SHGs for the samples processed by mechanical stretching and for electrically poled samples were compared. The nonlinear optical coefficients d_exp evaluated by Maker Fringe method of the electrically poled samples are 2-3 times larger than that of the mechanically oriented same whose d_exp is about 5pm/V. The high SHG of the main-chain type NLO polymers mainly originates from the additivity of hyperpolarizeability of the individual unit due to head to tail bonding.

Citation Download Citation

Tadahiro Asada and Hiroyuki Tanaka "Nonlinear optical properties of main-chain-type liquid crystalline polymers", Proc. SPIE 3143, Liquid Crystals, (30 October 1997); https://doi.org/10.1117/12.279260

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