DYNAMICS OF THE UV-INDUCED ABSORPTION OF LASER LIGHT BY COLOR CENTERS IN CRYSTALLINE KY_3F_(10):Ce~(3+),Yb~(3+)

摘要

A pump-probe method is used to study the dynamics of the destruction of color centers in KY_3F_(10):Ce~(3+) and KY_3F_(10):Ce~(3+),Yb~(3+) crystals by continuous UV radiation and to measure its parameters. The effect of Yb~(3+) ions in crystalline KY_3F_(10):Ce~(3+),Yb~(3+) on the rate of bleaching of color centers in it under exposure to the probe light is studied. Irradiation of KY_3F_(10):Ce~(3+) and KY_3F_(10):Ce~(3+), Yb~(3+) crystals at a wavelength corresponding to an absorption band of a color center accelerates the destruction of the color centers and the reduction of Yb~(2+) 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.