Abstract

Recently we have reported a permanent second order nonlinearity (χ⁽²⁾ ~ 1 pm/V) induced in bulk fused silica by a combined temperature/static electric field poling process.¹ Subsequently, a similar nonlinearity induced in a sputtered glass film by corona poling has been reported by Okada et al.² We report time-resolved measurements of the formation and decay of the nonlinearity for a sample maintained at an elevated temperature, while the applied electric field is switched on and off. Second harmonic generation (SHG) provides a sensitive real time probe of the second-order nonlinearity. In addition, we report a spectral study on possible sources of the nonlinearity.

© 1993 Optical Society of America