Silver nanoparticles filled hollow polymer fiber laser with enhanced photostability

Naturally Occurring Halloysite Nanotubes as Light Scatterers for Stable Random Lasing Applications

“…In fact, it has been reported that thermal conductivity k of PEG can be improved by the addition of nanoparticles, , and as much as an ∼88.6% enhancement in the k value of PEG in the presence of HNTs was recently observed (relevant literature data are summarized in Figure S6). Therefore, the presence of HNTs in a PEG solution enhances the photostability of RhB molecules during lasing operation, as schematically depicted in Figure b, also leading to increased RL performance in the highly viscous medium (Figure S5). It is worth noting that the P in used in our experiment is high, similar to some of the previous studies on RL. ,, It is the very good photostability and resistance to laser heating of our emitters, as obvious from the data in Figure , that conveniently allows us to use such high pumping powers without observing any significant photobleaching.…”

“…35,36 Interestingly, some works have found that dye photobleaching in EG can be prevented by the addition of suitable nanoparticles. 41,42 Overall, comprehensive research is still needed to design multifunctional scatterers for RL emission, which both have high scattering efficiency and grant high resistance to photobleaching to the gain molecules in a colloidal medium, while, from a fundamental point of view, the studies of RSB in colloidal-based RLs remain scanty. 35,43 Herein, we have employed, for the first time, two natural HNT samples collected from different geological deposits as passive scatterers to generate RL emission without any cavity feedback when combined with rhodamine B (RhB) dye.…”

“…On the other hand, stopping dye diffusion tends to enhance photobleaching effects. Even in conventional laser dyes, photobleaching is often observed under prolonged pumping due to poor thermal conductivity and diffusivity of the dispersing medium . Similarly, strong photobleaching of dye molecules in the presence of scatterers is one of the practical drawbacks of RLs in terms of long-term applications.…”

“…Similarly, strong photobleaching of dye molecules in the presence of scatterers is one of the practical drawbacks of RLs in terms of long-term applications. Actually, good chemical compatibility among the organic dye gain molecule and the scatterer is required to achieve high photostability, especially in a low-viscous colloidal system. , Interestingly, some works have found that dye photobleaching in EG can be prevented by the addition of suitable nanoparticles. , …”

Laser ablated silver nanoparticles doped blue light-emitting polymer optical fiber with enhanced photostability

“…Also, the presence of impurities within the polymer matrix causes thermal absorption, which leads to photo-bleaching. But metal nanoparticles can enhance the thermal diffusivity of the matrix, leading to efficient heat transfer from the gain medium [18]. The combined effect of these two processes leads to the better photostability of Ag-Bis-MSB co-doped polymer optical fiber.…”