Barna Valentin, De Cola Luisa
Opt Express. 2015 May 4;23(9):11936-45. doi: 10.1364/OE.23.011936.
The study of electromagnetic waves propagation in periodically structured dielectrics and the linear and nonlinear optical phenomena in disordered systems doped with gain media represent one of the most challenging and exciting scientific areas of the past decade. Lasing and Random Lasers (RL) are fascinating examples of topics that synergize multiple scattering of light and optical amplification and lately have been the subject of intense theoretical and experimental studies. In this manuscript we demonstrate laser action in a new category of materials, namely dye doped ionic liquids. Ionic liquids prove to be perfect candidates for building, as shown, a series of exotic boundaryless or confined compact laser systems. Lasing is presented in standard wedge cells, freely suspended ionic liquid films and droplets. The optical emission properties are investigated in terms of spectral analysis, below and above lasing energy threshold behavior, emission efficiency, far field spatial laser modes intensity profiling, temporal emission behavior etc. As demonstrated, these materials can be employed as optimal near future replacements of conventional flammable solvents in already available dye laser instruments.
对电磁波在周期性结构电介质中的传播以及掺杂增益介质的无序系统中的线性和非线性光学现象的研究，是过去十年中最具挑战性和令人兴奋的科学领域之一。激光和随机激光（RL）是将光的多次散射与光放大协同作用的有趣例子，并且最近一直是深入的理论和实验研究的主题。在本手稿中，我们展示了一类新型材料中的激光作用，即染料掺杂离子液体。如所示，离子液体被证明是构建一系列奇异的无边界或受限紧凑型激光系统的理想候选材料。在标准楔形腔、自由悬浮的离子液体薄膜和液滴中实现了激光发射。从光谱分析、低于和高于激光能量阈值行为、发射效率、远场空间激光模式强度分布、时间发射行为等方面研究了光发射特性。如所证明的，这些材料可以在现有的染料激光仪器中用作传统易燃溶剂的最佳近期替代品。
