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3 March 2020 Polydispersed Nd3+:YVO4+SiO2 powders for highly efficient random lasers
Jessica Dipold, Danilo A. A. da Silva, Allan Bereczki, E. Jimenez-Villar, Niklaus U. Wetter
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Proceedings Volume 11276, Optical Components and Materials XVII; 112760N (2020) https://doi.org/10.1117/12.2545028
Event: SPIE OPTO, 2020, San Francisco, California, United States
Abstract
Random lasers are cheap and easy to fabricate, having several different applications such as early cancer detection, encryption and Speckle-free imaging. However, few fabricated random lasers present high efficiency, which limits their possible applications. In a recent work, our group achieved a record efficiency by developing random lasers that use compacted, polydispersed yttrium vanadate doped with neodymium (Nd3+:YVO4) powders to create separate regions for gain and light diffusion. Large particles are responsible for the light diffusion, while the small particles that occupy the spaces between them create gain pockets, absorbing the pumped light. In this work, this strategy is refined by using passive particles (SiO2) for light diffusion, restricting the laser active particles to the gain pockets. The first attempt with this strategy used 30% of Nd3+:YVO4 small powders and 70% of large SiO2 particles. Without any further optimization, the result achieved is already 40% of the highest obtained efficiency in the previously studied Nd3+:YVO4 polydisperse sample, showing a promising result to further improve this new strategy and reach even larger efficiencies with less laser active material.
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Jessica Dipold, Danilo A. A. da Silva, Allan Bereczki, E. Jimenez-Villar, and Niklaus U. Wetter "Polydispersed Nd3+:YVO4+SiO2 powders for highly efficient random lasers", Proc. SPIE 11276, Optical Components and Materials XVII, 112760N (3 March 2020); https://doi.org/10.1117/12.2545028
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KEYWORDS
Neodymium
Particles
Random lasers
Absorption
Silica
Diffusion
Scanning electron microscopy
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