Abstract
Two-photon absorption (TPA) spectra of the Cr2O3 model antiferromagnet have been studied for two polarization configurations at energies ranging from 2.5 to 3.55 eV. Several strong TPA peaks with the maximum coefficient β ∼ 0.08 cm/MW are observed in the 2.7–3.1-eV range characterized by the 4A2(F) → 4T1(F) d-d one-photon transition of the Cr3+ ion. An analysis of the results obtained suggests that the general form of the TPA spectrum in this range is primarily determined by the resonance at the 2E(G) and 2T1(G) intermediate levels. At energies above 3.44 eV, the TPA coefficient sharply increases up to β ∼ 0.1 cm/MW due to transitions between the valence and conduction bands.
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