We have prepared polymer films doped with novel nonlinear organic ionic materials, pyrylium salt dyes, and have investigated the second-order nonlinear optical properties of these guest–host-type polymer films by changing the counterion and alkyl group derivatives. These films have no absorption in the blue-light region and have second-harmonic-generation activity without electric-field poling. The second-order nonlinearity of the nonpoled-polymer film is constant, with no relaxation at room temperature or at high temperatures. We fabricated a second-harmonic-generation device with the nonpoled-polymer film and observed Čerenkov-type phase-matched second-harmonic-generation of a Nd:YAG laser.

© 2001 Optical Society of America


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  1. H. Nakayama, O. Sugihara, N. Okamoto, H. Saito, A. Mizuno, and R. Matsushima, "Nonpoled polymeric films doped with blue-window pyrylium salt dyes for second-harmonic-generation devices ," J. Opt. Soc. Am. B 15, 477-483 (1998) http://www.opticsinfobase.org/abstract.cfm?URI=josab-15-1-477

Matsushima, Ryoka

Mizuno, Atsushi

Nakayama, Hideki

Okamoto, Naomichi

Saito, Hirohisa

Sugihara, Okihiro