Abstract
Optical transient induced absorption and bleaching as a function of wavelength for reduced SrTiO3 with a picosecond pump–probe technique have been studied. An energy-level model of the reduced SrTiO3 is proposed to explain the experimental results. The reduced SrTiO3 crystal examined has two absorption bands centered at 1.7 eV and 2.4 eV, which are assigned to transitions from levels lying in the band gap approximately 1.5 eV and 0.8 eV above the valence band, respectively, to the conduction band. The relaxation times of electrons from the conduction band to the level at 1.5 eV and from the level at 1.5 eV to the level at 0.8 eV are determined to be ∼40 ps and much larger than 500 ps, respectively.
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