Real-time spectroscopy of novel solid-state random lasers

摘要

Herein we report efficient random lasing in two powder samples containing rhodamine 6G (Rh6G) doped SiO_2 nanoparticles which are either directly dispersed within pure silica particles or embedded in a silica gel matrix which is subsequently ground. Basic properties of random lasing such as emission kinetics, emission spectrum, and stimulated emission threshold are investigated in both novel solid-state materials by real-time spectroscopy. The laser-like emission dynamics of the ground powder obtained out of a bulk silica gel containing 2% Rh6G-SiO_2 nanoparticles was accurately described by a light diffusive propagation model. The device behavior is close to a conventional ultrafast Q-switched laser, which is a very interesting feature aimed to further applications.