Based on a brief review on nanostractual ZnO, the talk will be focus on our recent researches on ZnO nanostructures and
lasering actions. Controlling the growth conditions, various novel morphologies of nanostructural ZnO, such as nanodisks,
aligned and symmetric whiskers and mirco/nanotubes have be fabricated by vapor-phase transport method based on vapor-
liquid-solid mechanism. Amplified spontaneous emission and laser in UV range have been observed in some aligned arrays.
The amplification and resonant behaviors will be analyzed in random, Fabry-Perot, and whispering gallery microcavities.
In this paper, we show a kind of wavelength selective elements for optical communications using linearly chirped moire fiber gratings. According to the coupled-mode theory, the spectral characteristics of linearly chirped moire fiber gratings are studied. By choosing the grating length, the induced refractive index change, and the linear chirp coefficient, various optical transmission filters based on linearly chirped moire fiber gratings can be achieved. These filters are very useful for add/drop operations in wavelength-division-multiplexed (WDM) systems. A novel scheme of optical add-drop multiplexer (OADM) configuration based on linearly chirped moire fiber grating filter is proposed for flexible multiple wavelengths add-drop in WDM systems.
Two-photon absorption coefficients and the corresponding absorption cross sections of 5-(9-anthryl)-3-(4-nitrophenyl)- 1-phenyl-2-pyrazoline (ANPP) are obtained from intensity dependent transmission measurements. The linear and nonlinear fluorescence spectra of ANPP have been studied. The linear florescence spectrum of ANPP has two emission bands originating from the anthryl and pyrazoline moieties of ANPP on excitation at 355-nm, respectively. The nonlinear two- photon and three-photon fluorescence from these two moieties are observed simultaneously when ANPP is excited at 1064-nm due to the proximity of the absorption bands of these two moieties to (lambda) /3 and (lambda) /2 of the exciting wavelength. The similar spectra structure indicates that the nonlinear and linear fluorescence originates from the same relaxation process.
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