Random lasers (RLs) have been thoroughly studied for applications such as high definition speckle free imaging, lithography, miniature spectroscopy, etc. RLs made with crystalline powders have shown promising results, with high emission efficiencies and narrow wavelength bandwidth. However, few studies on glass random lasers have been made, since its inhomogeneous broadening make it hard to verify the linewidth narrowing characteristic of laser emission. Here, we describe linewidth and temporal measurements for a TZA glass doped with 16 wt% neodymium. We verified a 0.5 nm linewidth narrowing at laser threshold. The pump intensity where the transition occurs coincided with the appearance of a faster emission decay, showing the presence of laser emission for higher pump power energies. This result is promising in understanding random lasing for glass powders.
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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