Sol-gel-processed silica films doped with organic azo dye, Disperse Red 1 (DRl) in a higher concentration of 21.7 wt%, were prepared at a higher baking temperature with corona poling of higher voltage than in other reports to obtain stable and large second harmonic generation (SHG) and film strength. A large effective SHG coefficient of 75 pm/V was measured for the film of 0.2-Sm thickness at a fundamental wavelength of 1064 nm, and the value was unvaried for 700 h with no relaxation. Moreover, a waveguide SHG device of four-layer structure with DRl-doped sol-gel film as a top layer was fabricated for the first time, and Cherenkov-type phase-matched SHG was observed successfully.
- Cherenkov-type phase matching
- Corona poling
- Organic/inorganic complex film
- Sol-gel processing
- Stable and large second harmonic generation
ASJC Scopus subject areas
- Physics and Astronomy(all)