Manifestation of europium ions in photoinduced absorption of lanthanum–gallium-sulfide-oxide glasses

 Illumination of Eu-doped lanthanum–gallium-sulfide-oxide glasses by doubled-frequency coherent laser pulses of Nd-YAG lasers at power densities 20–120 MW/cm2 has shown an occurrence of photoinduced changes of fundamental absorption edge. Moreover, the total absorption was changed up to 25% in the transparent spectral range. Different rare-earth impurities cause different spectral shifts of absorption edge. Among them europium ions demonstrated the highest photoinduced changes. This may be caused by a relatively large polarizabiity of these ions compared to other rare earth ions. This opens a rare possibility to use the investigated sulfide glasses for recording of dynamic holograms.