Active media based on polyurethane doped with a binary dye mixture

S. Nikolaiev, V. Pozhar, M. Dzyubenko, K. Nikolaiev
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Abstract

Subject and Purpose. The article is concerned with the spectral-luminescent and lasing characteristics of the radiation from solid-state active media based on polyurethane activated by a binary mixture of dyes. The purpose of these studies is to demonstrate a possibility of the spectral range expansion of the emission from solid-state dye lasers with polyurethane active elements. Methods and Methodology. Specially prepared samples of polyurethane active media having the same donor (Rhodamine 6G) concentration but various acceptor (Sulforhodamine 101) concentrations are experimentally studied for their spectral-luminescent and lasing characteristics. Results. The main spectroscopic characteristics of Rhodamine 6G and Sulforhodamine 101 in polyurethane have been measured, the nonradiative energy transfer parameters in this molecular pair estimated. It has been demonstrated that the matrix emission spectrum can be purposefully transformed by selection of relative concentrations of dyes in the mixture. In a broadband resonator, either a single- or two-band emission with different positions and various intensities of spectral bands is observed depending on the acceptor concentration. In a dispersive resonator under the same conditions, the tuning range of the lasing spectrum expands and extends to the longer wavelengths. Conclusion. The prospects of using donor-acceptor dye mixtures for improving spectral characteristics of polyurethane active elements in solid-state dye lasers have been confirmed. It has been shown that signatures of the emission characteristics of these media are governed by the mechanism of the excitation energy transfer between dye molecules. Lasing has been obtained on polyurethane matrices with the emission wavelength tuning throughout the “green-red” region of the spectrum.
以聚氨酯为基础的活性介质掺杂二元染料混合物
主题和目的。本文研究了二元混合染料活化的固态聚氨酯活性介质辐射的光谱发光和激光特性。这些研究的目的是证明具有聚氨酯活性元素的固态染料激光器发射光谱范围扩展的可能性。方法和方法论。实验研究了具有相同给体(罗丹明6G)浓度和不同受体(硫代丹101)浓度的聚氨酯活性介质样品的光谱发光和激光特性。结果。测定了罗丹明6G和硫代丹101在聚氨酯中的主要光谱特征,估计了这对分子对的非辐射能量传递参数。已经证明,通过选择混合物中染料的相对浓度,可以有目的地改变基质发射光谱。在宽带谐振腔中,根据受体浓度的不同,可以观察到具有不同位置和不同光谱带强度的单波段或双波段发射。在相同条件下的色散谐振腔中,激光光谱的调谐范围扩大并延伸到更长的波长。结论。在固态染料激光器中,使用供体-受体染料混合物改善聚氨酯活性元素光谱特性的前景已经得到证实。研究表明,这些介质的发射特性的特征是由染料分子之间的激发能转移机制决定的。在聚氨酯基体上获得了激光,其发射波长在整个光谱的“绿-红”区域进行调谐。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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