The optical properties of composition-spread films showing high third-order optical nonlinearity are systematically investigated. Desired orientations and high crystallinity are obtained for the entire composition by employing a composition-spread buffer layer and a temperature-gradient method in order to compensate the change in lattice mismatch and growth temperature depending on Linear absorption spectra and third-harmonic intensity with an exciting wavelength of 1.56 μm are measured as a function of As the Cu–O bond length increases with the charge-transfer gap decreases and the third-harmonic intensity increases, and both the charge-transfer gap and third-harmonic intensity change almost linearly with between and
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© 2003 American Institute of Physics.
2003
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