Corona poling of a 1.2 μm-thick stack of phosphorus-doped and undoped silica glass layers on silica leads to a 14-fold enhancement of the SHG relative to poling of the substrate alone.

Bragg Gratings, Photosensitivity, and Poling in Glass Waveguides, BGPP 2010
Department of Electronics

Yadav, K. (K.), Smelser, C, Jacob, S. (S.), Blanchetiere, C. (C.), Callender, C.L. (C. L.), & Albert, J. (2010). Enhanced second-order nonlinearities in multilayers of nanoscale doped silica thin films. In Optics InfoBase Conference Papers.