Zhong X, Yang J, Ha Y, Meng J, Li Y
Dept. of Physics, Sichuan University, 610064 Chengdu.
Guang Pu Xue Yu Guang Pu Fen Xi. 2001 Aug;21(4):450-3.
Fluorescence of Rhodamine 6G in aqueous solution is effectively enhanced by using anionic sodium dodecylsulfate (SDS) surfactant. When the concentration of Rhodamine 6G is 5.47 x 10(-7) mol.L-1 and 5.47 x 10(-4) mol.L-1, maximal enhancement ratio can be 1.95 and 9.7, respectively. In the latter case, using SDS can reduce the threshold and improve the energy conversion efficiency of the dye laser of Rhodamine 6G. In the absence of SDS, the laser threshold power density is near 65 MW.cm-2. While in the present of SDS, the threshold is reduced to 0.8 MW.cm-2. The laser energy conversion efficiency can reach 25% when the pumping power density is 65 MW.cm-2. We also observed the red shifts of absorption spectrum, fluorescence spectrum and the dye laser spectrum in the present of SDS. The physical mechanism of the phenomena is discussed.
通过使用阴离子十二烷基硫酸钠（SDS）表面活性剂，罗丹明6G在水溶液中的荧光得到有效增强。当罗丹明6G的浓度分别为5.47×10⁻⁷ mol·L⁻¹ 和5.47×10⁻⁴ mol·L⁻¹ 时，最大增强比分别可达1.95和9.7。在后一种情况下，使用SDS可以降低阈值并提高罗丹明6G染料激光器的能量转换效率。在没有SDS的情况下，激光阈值功率密度接近65 MW·cm⁻²。而在有SDS的情况下，阈值降至0.8 MW·cm⁻²。当泵浦功率密度为65 MW·cm⁻² 时，激光能量转换效率可达到25%。我们还观察到在有SDS的情况下吸收光谱、荧光光谱和染料激光光谱发生红移。并讨论了这些现象的物理机制。
