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Updated: Feb 2, 2026

Quasi-light Storage for Optical Data Packets
Published on: February 6, 2014
Quasi-phase-matched third harmonic generation in organic multilayers
Jiung Kim1, C H S S Pavan Kumar1, Myoungsik Cha2
1Department of Physics, Pusan National University, Busan, 609-735, Korea.
Abstract:
We report the first realization of quasi-phase-matched (QPM) third harmonic generation in isotropic polymer films. Spin-coated thin films of ethyl-violet molecules dispersed in a polymer host (EV) were used as cubic nonlinear optical media because of their transparency at both the fundamental (1230 nm) and the third harmonic (410 nm) wavelengths. A passive layer of a UV-curable material was formed to compensate the phase shift between the two light waves after propagating through each EV layer. We fabricated a series of samples with 1~4 EV layers (0~3 alternatingly coated passive layers). The third harmonic output power showed a quadratic increase with the number of layers, providing a strong evidence for successful quasi-phase-matching. A conversion efficiency of 0.15% was observed with a 190 fs pulse input.
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