罗丹明染料激发态吸收及非线性荧光效应研究

STUDY ON THE NONLINEAR ABSORPTION AND NONLINEAR FLUORESCENCE IN RHODAMINE DYES

系统研究了罗丹明 ６Ｇ和罗丹明 Ｂ的非线性吸收特性和荧光猝灭特性，结果表明它们在 ５３２ｎｍ的激光波长作用下，呈饱和吸收特性，在 ３５５ｎｍ的激光波长作用下呈现反饱和吸收特性，通过理论拟合得到了激发态吸收截面和能级寿命；并对荧光猝灭现象进行了解释，首次提出激发态吸收诱导荧光猝灭的理论．

The nonlinear absorption and photoquenching for the solution of Rhodamine 6 G and Rhodamine B are measured in details. They show SA in 532urn and RSA in 355urn. The absorption cross-section and lifetime of the excited-states are evaluated by fitting theoretical calculations with the experimental results. The photoquenching character is introduced and a theory of photoquenching ,induced by excited-state absorption is presented.