Al 2 O 3 – SiO 2 glasses doped with Sm 3+ ions were irradiated with an 800 nm wavelength femtosecond laser pulse and the formation of Sm 2+ ions was investigated. The Sm 3+ ions were reduced to Sm 2+ within a few minutes of laser irradiation. Electron spin resonance spectra indicated that the hole was trapped in non-bridging oxygen bound to Al 3+ , while the electron was captured in the Sm 3+ , leading to the Sm 2+ formation. The thermal stability of the photoinduced Sm 2+ ions was also investigated by fluorescence spectroscopy. The Sm 2+ ions were converted to Sm 3+ ions by heating the glasses in air at 300– 400°C.
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Park et al. (2003) studied this question.
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