Image of the Week: Laser-Stimulated Luminescence Emission near green wavelength of NaYF4 codoped with Yr3+/Er3+, stimulated with a 977-nm CW laser. Image captured in the Nano Optics Laboratory of the Federal University of Pernambuco, Recife, Brazil. —Dayvid Mello, Federal University of Pernambuco, Recife, Brazil *Link in Bio #Laser #Stimulated #Luminescence #Emission #wavelength #Optics #Brazil