OPTICAL ELEMENT, TITANIUM OXIDE GLASS USED FOR THE OPTICAL ELEMENT, AND LIGHT EMITTING METHOD AND

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An optical element exhibits either an up conversion light emitting characteristic or a light amplifying characteristic when irradiated with exciting light. The optical element includes a bulk glass having titanium oxide as a main component and the glass contains a rare earth element. As the rare earth element, for instance, at least an element of Er or Yb, and a combination of Yb and Tm are suitably used.