Abstract:We report efficient random lasing in a ground powder of a novel solid-state material based on silica gel containing SiO 2 nanoparticles embedding rhodamine 6G (Rh6G) dye. Basic properties of random lasing such as emission kinetics, emission spectrum, and threshold of stimulated emission are investigated by using real-time spectroscopy. The laser-like emission dynamics can be accurately described by a light diffusive propagation model. The device behavior is close to a conventional ultrafast Q-switched laser, which is an interesting fact aimed to further applications.
In this work, we analyse the light propagation in some laser and nonlinear crystal powders.
In particular, we study the dependence of the diffusive absorption lengths and
the transport lengths on particle size and volume filling factor. The theoretical
calculations have been made by assuming a diffusive propagation of light in these
materials.
A comprehensive model for the theoretical simulation of luminescent solar concentrators (LSCs) has been developed and examined. It can simulate the interdependent effects of multiple dopants having two main electronic energy states, which are incorporated simultaneously into the fiber core, as well as the effect of the cladding. The available experimental results appear to confirm the accuracy of the model, which is a valuable tool for gaining insight into the behavior of LSC prototypes, since it may guide the designers at the early stages of optimization processes.
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