Giant nonlinear absorption in the NiO antiferromagnet |
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Authors: | S I Shablaev R V Pisarev |
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Institution: | (1) Ioffe Physicotechnical Institute, Russian Academy of Sciences, Politekhnicheskaya ul. 26, St. Petersburg, 194021, Russia |
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Abstract: | A study of the spectrum of nonlinear two-photon and two-step absorption in NiO single crystals, carried out in the energy region ?ω1 + ?ω2 = 2.45–4.575 eV, showed it to have a complex shape and consist of very strong peaks (from 0.05 to 2.7 cm/MW). Within the energy interval 2.45–3.3 eV, the spectrum is due to d-d transitions in the Ni2+ ion. The band gap width was determined to be E g =3.466 eV. The spectral features seen above this energy originate from interband transitions from three valence subbands to the conduction band bottom. |
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