Cyprych Konrad, Sznitko Lech
Advanced Materials Engineering and Modeling Group, Wroclaw University of Science and Technology, Wybrzeze Wyspianskiego 27, 50-370 Wroclaw, Poland.
Polymers (Basel). 2021 Sep 19;13(18):3182. doi: 10.3390/polym13183182.
This article describes the random lasing (RL) phenomenon obtained in a dye-doped, polymeric double-phase system composed of PMMA and PVK polymers. It shows how relative concentrations between mentioned macromolecules can influence lasing parameters of the resulting blends, including obtained emission spectra and threshold conditions. We describe the influence of lasers' composition on their morphologies and link them with particular RL properties. Our studies reveal that the disorder caused by phase separation can support the RL phenomenon both in the waveguiding and quasi-waveguiding regimes. Changing the relative concentration of polymers enables one to switch between both regimes, which significantly influences threshold conditions, spectral shift, number of lasing modes, and ability to support extended and/or localized modes. Finally, we show that a simple phase separation technique can be used to fabricate efficient materials for RL. Moreover, it enables the tailoring of lasing properties of materials in a relatively wide range at the stage of the laser material fabrication process in a simple way. Therefore, this technique can be seen as a fast, cheap, and easy to perform way of random lasers fabrication.
本文描述了在由聚甲基丙烯酸甲酯（PMMA）和聚乙烯基咔唑（PVK）聚合物组成的染料掺杂聚合物双相系统中获得的随机激光（RL）现象。它展示了上述大分子之间的相对浓度如何影响所得共混物的激光参数，包括获得的发射光谱和阈值条件。我们描述了激光组成对其形态的影响，并将它们与特定的RL特性联系起来。我们的研究表明，相分离引起的无序在波导和准波导模式下都能支持RL现象。改变聚合物的相对浓度能够在两种模式之间切换，这会显著影响阈值条件、光谱位移、激光模式数量以及支持扩展和/或局域模式的能力。最后，我们表明一种简单的相分离技术可用于制造用于RL的高效材料。此外，它能够在激光材料制造过程阶段以简单的方式在相对较宽的范围内调整材料的激光特性。因此，该技术可被视为一种快速、廉价且易于实施的随机激光制造方法。
