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首页> 外文期刊>Journal of Nuclear Physics, Material Sciences, Radiation and Applications >Energy Transfer Dye Laser Study of Influence of Various Coumarin Dyes on the Laser Performance of Rh590(Cl) Dye
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Energy Transfer Dye Laser Study of Influence of Various Coumarin Dyes on the Laser Performance of Rh590(Cl) Dye

机译：能量转移染料激光研究各种香豆素染料对Rh590（Cl）染料激光性能的影响

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Different coumarin dyes(C440, C460, C480, C485, C500 and C540A) are mix ed with Rh590(Cl) in ethanol. The effect of coumarin dyes and their concentration on the laser gain properties and photostabilities of Rh590(Cl) is studied and discussed by investigating the gain characteristics at various concentrations and pump powers of N2–laser. It is found that for C480 and C540A dyes at optimized concentration, most of the absorbed pump power is transferred to Rh590(Cl) as a useful pump power. The gain characteristics of Rh590(Cl)are found to be changed due to change in the fluorescence lifetime. The mechanism responsible for the improvement in the laser performance and gain characteristics of Rh590(Cl) resulted from the energy transfer from these coumarin dyes. This improvement in the laser efficiency of Rh590(Cl) varied sharply depending upon the kind of coumarin dye. The theoretical calculations are also done to find the total transfer efficiency at various donor concentrations to identify the appropriate energy transfer mechanism responsible for gain enhancement in Rh590(Cl) dye. These calculations take into account the contribution due to both radiative and non radiative energy transfer. In these dye mixtures the energy transfer excitation was found to overcome the inner filter effect and other losses such as photoquenching. The concentration dependence of peak gain and the lasing wavelengths of ETDL have been studied. The experimental results indicate that the dominant mechanism responsible for the efficient excitation transfer in these mixtures is of non radiative nature due to long range dipole-dipole interaction. A broader tunable range is also provided by energy transfer.
机译：将不同的香豆素染料（C440，C460，C480，C485，C500和C540A）与Rh590（Cl）在乙醇中混合。研究了香豆素染料及其浓度对Rh590（Cl）的激光增益特性和光稳定性的影响，并通过研究N2激光器在不同浓度和泵浦功率下的增益特性来研究和讨论。发现对于最佳浓度的C480和C540A染料，大部分吸收的泵浦功率会作为有用的泵浦功率转移到Rh590（Cl）中。发现Rh590（Cl）的增益特性由于荧光寿命的改变而改变。这些香豆素染料的能量转移导致了Rh590（Cl）的激光性能和增益特性改善的机理。 Rh590（Cl）的激光效率的提高取决于香豆素染料的种类而有很大差异。还进行了理论计算，以发现各种供体浓度下的总转移效率，以确定负责Rh590（Cl）染料增益增加的适当能量转移机制。这些计算考虑了辐射和非辐射能量转移的影响。在这些染料混合物中，发现能量转移激发克服了内部过滤效应和其他损失，例如光猝灭。研究了峰值增益的浓度依赖性和ETDL的激光波长。实验结果表明，由于长距离偶极-偶极相互作用，导致这些混合物中有效激发转移的主要机理是非辐射性的。能量传递还提供了更大的可调范围。

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