Resonantly enhanced femtosecond second-harmonic generation and nonlinear luminescence in GaN film grown on sapphire
Date
2006
Authors
Yang, Hui
Xu, S. J.
Li, Q.
Zhang, Jie
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Publisher
American Institute of Physics (AIP)
Abstract
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 reveal that the reabsorptioo of the SHG photons with energies higher
than the fundamental gap of GaN significantly contributes to generation of the efficient NPL
signal.
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Keywords
femtosecond laser, tuable broadband, second-harmonic generation (SHG), GaN film, sapphire, nonlinear photoluminescence (NPL)
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Applied Physics Letters
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Journal article
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