OPTICAL ELEMENT, TITANIUM-BASED OXIDE GLASS FOR USE IN THE SAME, AND LIGHT EMITTING METHOD AND OPT

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PROBLEM TO BE SOLVED : To provide a high-durability optical element having the property of upconversion light emitting and/or optical amplification. SOLUTION : The optical element exhibits the property of at least one of upconversion light emitting and optical amplification upon irradiation with excitation light, and contains bulk glass containing titanium oxide as a main component, wherein the glass further contains a rare earth element. For example, at least one of Er and Yb or a combination of Yb and Tm is preferably used as the rare earth element. COPYRIGHT : (C)2008, JPO&INPIT