Li, Q.; Xu, S. J.; Li, G. Q.; Dai, D. C.; Che, C. M.
We report an observation of efficient two-photonphotoluminescence (TPL) of InGaN∕GaN multi-quantum-well (MQW) structures using broadband femtosecond near-infrared excitation laser. Near quadratic excitation-intensity dependence and asymmetric collinear interferometric autocorrelation trace of the TPL signal unambiguously verify the nonlinearity of the TPL process. We also measured the excitation spectrum of the TPL signal and found that it can be fitted well with the theoretical two-photon...[Show more]
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