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Jiung Kim1, C H S S Pavan Kumar1, Myoungsik Cha2

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|November 8, 2018
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This summary is machine-generated.

Researchers achieved quasi-phase-matched third harmonic generation in polymer films for the first time. This nonlinear optical method utilized ethyl-violet molecules and passive layers, showing a quadratic increase in output power with more layers.

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Area of Science:

  • Nonlinear Optics
  • Materials Science

Background:

  • Third harmonic generation (THG) is a key nonlinear optical process.
  • Achieving efficient THG typically requires phase-matching conditions.
  • Isotropic materials pose challenges for traditional phase-matching techniques.

Purpose of the Study:

  • To demonstrate quasi-phase-matched (QPM) third harmonic generation in isotropic polymer films.
  • To investigate the use of ethyl-violet (EV) molecules in a polymer host for THG.
  • To develop a method for compensating phase shifts in multilayer polymer films.

Main Methods:

  • Fabrication of multilayer polymer films by spin-coating ethyl-violet (EV) molecules in a polymer host.
  • Incorporation of a passive UV-curable layer between EV layers to manage phase shifts.
  • Systematic variation of the number of EV layers (1-4) and passive layers (0-3).
  • Characterization of third harmonic output power as a function of layer number.

Main Results:

  • Successful realization of QPM third harmonic generation in isotropic polymer films.
  • Observed a quadratic increase in third harmonic output power with an increasing number of EV layers.
  • Demonstrated the effectiveness of alternating passive layers in achieving quasi-phase-matching.
  • Achieved a conversion efficiency of 0.15% with 190 fs pulse input.

Conclusions:

  • Quasi-phase-matched third harmonic generation is feasible in isotropic polymer films.
  • The multilayer approach with passive compensation layers effectively enables QPM.
  • Ethyl-violet dispersed polymer films are promising nonlinear optical media for THG applications.