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.

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Conference Bragg Gratings, Photosensitivity, and Poling in Glass Waveguides, BGPP 2010
Citation
Yadav, K., Smelser, C, Jacob, S., Blanchetiere, C., Callender, C.L., & Albert, J. (2010). Enhanced second-order nonlinearities in multilayers of nanoscale doped silica thin films. Presented at the Bragg Gratings, Photosensitivity, and Poling in Glass Waveguides, BGPP 2010.