Large second-harmonic signal in thermally poled lead glass-silica waveguides

Luo, Y.; Biswas, A.; Frauenglass, A.; Brueck, S. R. J.
June 2004
Applied Physics Letters;6/14/2004, Vol. 84 Issue 24, p4935
Academic Journal
Thermal poling of silica-lead glass-silica waveguides formed by laser ablation of lead glass and e-beam evaporation of the silica cladding is reported. A large nonlinearity localized within the Pb-glass layer was found by scanning the probe laser beam across an angle-polished sample, and a peak second-order nonlinear susceptibility χ(2) as high as 15 pm/V was achieved in the Pb-glass layer. A simple theoretical model based on charge transport in the different materials during poling is proposed to explain complex χ(2) profile. The large third-order nonlinearity of lead glass plays a key role in the generation of the large second-harmonic signal. © 2004 American Institute of Physics.


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