TY - GEN
T1 - Lasing and laser-induced motion of zinc oxide nano-crystals irradiated by ultraviolet laser beam
AU - Okazaki, K.
AU - Nakamura, D.
AU - Higashihata, M.
AU - Okada, T.
PY - 2011
Y1 - 2011
N2 - The lasing characteristics and the alignment methods of ZnO nanocrystals were investigated for an application to ultraviolet (UV) laser diode (LD). ZnO nanowires and nanosheets were synthesized on a silicon substrate by a CVD method or nanoparticle assisted pulsed-laser deposition (NAPLD), and then those ZnO nanocrystals were examined by a photoluminescence (PL) method with a third-harmonic Nd:YAG laser (355 nm, 5 ns). The observed emission spectra showed the obvious lasing characteristics having mode structure and a threshold for lasing. The threshold power density of a ZnO nanowire and a nanosheet were measured to be 100 kW/cm2 and 5 kW/cm2, respectively. Furthermore, the threshold power was calculated to be 8.4 mW for a ZnO nanowire and 2.5 mW for a ZnO nanosheet. Then the oscillation mechanisms were discussed on those ZnO nanocrystals. We also observed the laser-induced motion (LIM) of ZnO nanocrystals when they were excited by ultraviolet laser beam.
AB - The lasing characteristics and the alignment methods of ZnO nanocrystals were investigated for an application to ultraviolet (UV) laser diode (LD). ZnO nanowires and nanosheets were synthesized on a silicon substrate by a CVD method or nanoparticle assisted pulsed-laser deposition (NAPLD), and then those ZnO nanocrystals were examined by a photoluminescence (PL) method with a third-harmonic Nd:YAG laser (355 nm, 5 ns). The observed emission spectra showed the obvious lasing characteristics having mode structure and a threshold for lasing. The threshold power density of a ZnO nanowire and a nanosheet were measured to be 100 kW/cm2 and 5 kW/cm2, respectively. Furthermore, the threshold power was calculated to be 8.4 mW for a ZnO nanowire and 2.5 mW for a ZnO nanosheet. Then the oscillation mechanisms were discussed on those ZnO nanocrystals. We also observed the laser-induced motion (LIM) of ZnO nanocrystals when they were excited by ultraviolet laser beam.
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U2 - 10.1117/12.875793
DO - 10.1117/12.875793
M3 - Conference contribution
AN - SCOPUS:79952651009
SN - 9780819484598
T3 - Proceedings of SPIE - The International Society for Optical Engineering
BT - Synthesis and Photonics of Nanoscale Materials VIII
T2 - Synthesis and Photonics of Nanoscale Materials VIII
Y2 - 24 January 2011 through 25 January 2011
ER -