Organic materials for nonlinear optics

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Abstract
This review discusses nonlinear optical (NLO) polymeric materials. As an example of a second‐order NLO material, a novel copolymer with a diazo dye attached is investigated. The second‐order NLO coefficient χ(2)of the copolymer reaches 1.0 × 10−6esu, which is 7 times larger than that of LiNbO3. A third‐order NLO coefficient χ(3)larger than 10−10esu is obtained for polymers where NLO dyes are introduced into the polymer backbone. The optical transmission loss of these polymers is revealed to be around 2 dB/cm. As these polymers can be formed into channel waveguides using the photo‐bleaching technique, they show promise for use in NLO devices because of their processability, transparency and large optical nonlinearity.