Abstract
A study of transient optical absorption of the ADP (NH4H2PO4) and KDP (KH2PO4) nonlinear crystals in the visible and UV spectral regions is reported. Measurements made by absorption optical spectroscopy with nanosecond-time resolution established that the transient optical absorption (TOA) of these crystals originates from optical transitions in the hole A and B radicals and the optical-density relaxation kinetics is rate-controlled by interdefect tunneling recombination, which involves these hole centers and the electronic H0 centers representing neutral hydrogen atoms. At 290 K, hole polarons and the H0 centers undergo thermally stimulated migration, which is not accompanied by carrier ejection into the conduction or valence band. The slow components of the TOA kinetics with characteristic times from a few tens of milliseconds to a few seconds can be assigned to diffusion-controlled annihilation of hydrogen vacancies associated with impurity or structural defects.
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Translated from Fizika Tverdogo Tela, Vol. 44, No. 5, 2002, pp. 845–852.
Original Russian Text Copyright © 2002 by Ogorodnikov, Yakovlev, Shul’gin, Satybaldieva.
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Ogorodnikov, I.N., Yakovlev, V.Y., Shul’gin, B.V. et al. Transient optical absorption of hole polarons in ADP (NH4H2PO4) and KDP (KH2PO4) crystals. Phys. Solid State 44, 880–887 (2002). https://doi.org/10.1134/1.1477487
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DOI: https://doi.org/10.1134/1.1477487