Yang, Hui; Xu, S. J.; Li, Q.; Zhang, Jie
At room temperature, by using a tuable broadband femtosecond laser as excitation source we
observed second-harmonic generation (SHG) and nonlinear photoluminescence (NPL) in GaN film
grown on sapphire simultaneously or individually. In addition to the observation of the resonance
effect of the nonlinear response when the SHG is tuned to coincide with the near-band-edge
emission, we carefully measured dependence of the SHG and NPL signals on polarization of the
excitation light The results...[Show more]
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