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Random Lasers: Polydispersed Powders (Nd 3+ :YVO 4 ) for Ultra Efficient Random Lasers (Part. Part. Syst. Charact. 4/2018)
Author(s) -
Wetter Niklaus U.,
Giehl Julia M.,
Butzbach Felix,
Anacleto Danilo,
JiménezVillar Ernesto
Publication year - 2018
Publication title -
particle and particle systems characterization
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.877
H-Index - 56
eISSN - 1521-4117
pISSN - 0934-0866
DOI - 10.1002/ppsc.201870011
Subject(s) - laser , random laser , diffusion , optics , materials science , optoelectronics , physics , thermodynamics , lasing threshold
An ultra‐efficient random laser was achieved with record laser efficiency of 50% by controlling gain and light diffusion separately. In article 1700335 , Niklaus Wetter and co‐workers show that pockets of small Nd 3+ :YVO 4 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.