Dynamics of the UV-Induced Absorption of Laser Light by Color Centers in Crystalline KY3F10:Ce3+,Yb3+

A pump-probe method is used to study the dynamics of the destruction of color centers in KY₃F₁₀:Ce³⁺ and KY₃F₁₀:Ce³⁺,Yb³⁺ crystals by continuous UV radiation and to measure its parameters. The effect of Yb³⁺ ions in crystalline KY₃F₁₀:Ce³⁺,Yb³⁺ on the rate of bleaching of color centers in it under exposure to the probe light is studied. Irradiation of KY₃F₁₀:Ce³⁺ and KY₃F₁₀:Ce³⁺,Yb³⁺ crystals at a wavelength corresponding to an absorption band of a color center accelerates the destruction of the color centers and the reduction of Yb²⁺ ions to the trivalent state in proportion to the density of the radiation. A model is constructed for the bleaching mechanism that can be used to estimate the ionization cross section of the color centers.