Highly efficient broadband second harmonic generation using polydomain epitaxial barium titanate thin film waveguides
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Broad band second harmonic generation (SHG) over the spectral range of 530-700 nm is reported using an epitaxial barium titanate (BaTiO3) thin film waveguide. The epitaxial layers are multidomain consisting of both a and c domain variants. The SHG conversion efficiency is nearly independent of wavelength over the visible spectra range. An enhanced broadband conversion efficiency was observed that is attributed to random quasi-phase matching in the polydomain epitaxial layers. In contrast to theory of SHG for disordered nonlinear media, the observed SHG shows a quadratic dependence on pump power. © 2008 American Institute of Physics.
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Lin, P. T., Wessels, B. W., Jang, J. I., & Ketterson, J. B.
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