Multi-photon excited UV luminescence of ZnO nanorods after irradiation with few-nJ femtosecond laser pulses. Das, S.K; Byrne, D; McGlynn, E; Bock, M; Grunwald, R. Lasers and Electro-Optics/Quantum Electronics and Laser Science Conference: 2010 Laser Science to Photonic Applications, CLEO/QELS 2010 2010