Random Lasers: Polydispersed Powders (Nd³⁺:YVO₄) for Ultra Efficient Random Lasers (Part. Part. Syst. Charact. 4/2018)

Abstract

An ultra‐efficient random laser was achieved with record laser efficiency of 50% by controlling gain and light diffusion separately. In article https://doi.org/10.1002/ppsc.201700335, Niklaus Wetter and co‐workers show that pockets of small Nd3+:YVO4 particles trapped between large particles receive a 5 times higher pump density and act as gain centers whereas the larger particles govern the light distribution, redirecting the pump light onto the pockets from all sides.