90° phase matching in periodically poled fused silica is achieved over approximately 2 mm at a wavelength of 1064 nm. Electrical poling was done at 5 kV for 120 min using photolithographed periodic electrodes on fused silica glass at 250 °C. A nonlinearity equivalent to d 11/200 of quartz is estimated from measurements. Several phase‐matched interactions are reported and the implications for device applications discussed.
Kashyap, R., Veldhuis, G. J., Rogers, D. C., & Mckee, P. F. (1994). Phase-matched second-harmonic generation by periodic poling of fused silica. Applied physics letters, 64(11), 1332-1334. https://doi.org/10.1063/1.111925