In this work, we developed and investigated a random laser based on rhodamine6G (Rh6G) in ethylene glycol (EG) solution with varying cellulose nanocrystalline (CNC) needles as scatterers in the lasing media. Besides the suspension-in-cuvette scheme, an alternative configuration was also employed: a dye-CNC flexible self-supported thick-film (70 µm) random laser made by drop casting of the ${\rm CNCs}+{\rm Rh6G}+{\rm hydroxypropyl}$ cellulose suspension. In relation to conventional scatterers, the biodegradable cellulose nanocompounds showed a comparable reduction in both the spectral full width at half-maximum and the energy threshold values, with an optimal concentration of 5 mg [CNC]/ml[EG] in suspension. Its performance was also compared with other cellulose-based random lasers, presenting advantages for some parameters. The flexible film configuration showed similar results, but contained 10% less Rh6G than the suspension.

中文翻译：

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染料掺杂生物可降解纤维素纳米晶针中的柔性随机激光器

在这项工作中，我们开发和研究了基于罗丹明6G（Rh6G）在乙二醇（EG）溶液中的随机激光器，并使用不同的纤维素纳米晶体（CNC）针作为激光介质中的散射体。除了比色皿悬浮方案外，还采用了另一种配置：通过滴铸$ {\ rm CNCs} + {\ rm Rh6G制成的染料-CNC柔性自支撑厚膜（70 µm）随机激光器。} + {\ rm羟丙基} $纤维素悬浮液。与常规散射体相比，可生物降解的纤维素纳米化合物在半峰最大光谱全宽和能量阈值方面均表现出类似的降低，悬浮液的最佳浓度为5 mg [CNC] / ml [EG]。还将其性能与其他基于纤维素的随机激光器进行了比较，显示出某些参数的优势。柔性膜的配置显示出相似的结果，但是Rh6G的含量比悬浮液少10％。