Hideki NAKAYAMA,¹ Okihiro SUGIHARA,² Hisashi FUJIMURA,² Ryoka MATSUSHIMA¹ and Naomichi OKAMOTO¹

¹The Graduate School of Electronic Science and Technology, Shizuoka University, ²Faculty of Engineering, Shizuoka University, 3-5-1 Johoku, Hamamatsu, 432 Japan

(Received May 9, 1995; Accepted June 20, 1995)

Sol-gel processed poled silica films doped with novel nonlinear organic materials, thiazole azo dye (TA), are prepared in high concentration. Resonance enhanced second-order nonlinear optical coefficient of d₃₃=154 pm/V is obtained from TA doped silica film (40 wt%) for the fundamental wavelength of 1064 nm. The value d₃₃ is unvaried for at least 100 h under a high temperature condition (100°C) without any relaxation. Wave-length dependent second-order nonlinearity is also measured.

Key words : thiazole azo dye, second harmonic generation (SHG), poled silica film, resonance enhanced SHG, thermal stability