Enhanced optical third harmonic generation in thick organic films

Hee Joo Choi, Myoungsik Cha

Research output: Contribution to journalArticlepeer-review

8 Scopus citations


In order to enhance optical third-harmonic generation (THG) in polymer films, we investigated linear and nonlinear optical properties of polymer films containing ethyl-violet with varying thickness. The THG intensity increased monotonically with thickness, as opposed to the theory for non-phase-matched THG in films thicker than the coherence length. By measuring the refractive indices, we found that the difference between the indices of the fundamental and the third-harmonic was smaller in thicker films. Thus, the coherence lengths for thicker films were evaluated to be larger than those for the thin films, explaining the monotonic increase of the THG signal with thickness.

Original languageEnglish (US)
Pages (from-to)501-508
Number of pages8
JournalJournal of Nonlinear Optical Physics and Materials
Issue number4
StatePublished - Sep 2011
Externally publishedYes


  • Coherence length
  • Phase-matching
  • Polymer film
  • Third-harmonic generation

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Physics and Astronomy (miscellaneous)


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