Formation and assignment of silver defect centres in phosphate glass induced by femtosecond laser pulses

We have investigated the formation and assignment of silver defect centres such as Ag0, Ag2+ and other molecular silver species induced by femtosecond (fs) laser pulse irradiation. In particular, direct precipitation of silver nanoparticles without heat treatment was demonstrated to clarify the formation kinetics of silver defect centres in a radiophotoluminescent phosphate glass by 250 kHz high repetition rate fs laser pulses. Comparison using X-ray and fs laser irradiation methods is also presented.