Abstract
We report photoinduced valence changes of samarium ions inside a silica-based glass using focused femtosecond-laser pulses of 800 nm wavelength. Photoluminescence spectra reveal that femtosecond-laser irradiation reduces Sm3+ in the vicinity of the focal point of the laser beam to Sm2+. The mechanism of the photoinduced reduction of Sm3+ is discussed based on optical absorption and electron spin resonance spectra.
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