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Third-harmonic generation in polyphenylacetylene: Exact determination of nonlinear optical susceptibilities in ultrathin films

✍ Scribed by D. Neher; A. Wolf; C. Bubeck; G. Wegner

Publisher
Elsevier Science
Year
1989
Tongue
English
Weight
520 KB
Volume
163
Category
Article
ISSN
0009-2614

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✦ Synopsis

Third-harmonic generation measurements have been performed at 10= 1064 nm on ultrathin films of polyphenylacetylene. The nonlinearsusceptibilityX2 X ( -3~; w, w, o) wasdeterminedtobe (7.0 I! 1.0) x 10-rlesu withthephaseof~rs'equai to 152" f 5" indicating that two-and three-photon resonances contribute to the observed nonlinearity. The influence of back-reflection effects was estimated experimentally by measurements in different optical configurations. We found the experimental data could only be explained by using an evaluation procedure including all bound waves in the layer system.

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