| 초록 |
By increasing excitation intensity on laser power intensity, various nonlinear processes are induced. For nonlinear process, there is great interest of interaction between laser sources and TPA chromophores by nonlinear photophysics on structural effects. To investigate photophysical properties on the various structural effects of two-photon absorbing (TPA) chromophores, We have measured fluorescence dynamics for long time range delayed and femtosecond (fs) time resolved fluorescence using a cw Nd: YAG laser with 7 ns pulse width and a mode-locked Ti:sapphire laser with 150 fs pulsed width in the solution at room temperature and 77 K, respectively. On pulsed excitation, the following types of experiments have been carried-out: 1) optical spectra detected by means of a gated optical multi-channel analyzer (OMA), 2) fluorescence excitation spectra on laser poser intensity. |
