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I. Pracka

Bio: I. Pracka is an academic researcher. The author has contributed to research in topics: Lithium niobate & Absorption spectroscopy. The author has an hindex of 11, co-authored 33 publications receiving 331 citations.

Papers
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Journal ArticleDOI
TL;DR: In this paper, the up-conversion of trivalent holmium ion (Ho3+) doped: YAP, YAG, YLF, SrLaGa3O7 and SLLO4 crystals and ZBLAN glass was investigated.

43 citations

Journal ArticleDOI
TL;DR: In this article, the authors investigated the spectroscopic properties of trivalent praseodymium (Pr 3+ ) doped SrLaGa 3 O 7 (SLG) crystals at various temperatures.

32 citations

Journal ArticleDOI
TL;DR: In this article, single crystals of lithium niobate doped with 0.03 and 0.1% of Cu or Fe ions were grown by the Czochralski technique.
Abstract: Single crystals of lithium niobate doped with 0.03 and 0.1 at.% of Cu or Fe ions were grown by the Czochralski technique. Optical absorption spectra in visible and infrared regions before and after • irradiation with doses up to 10 5 Gy were measured and positions of both dopants in LiNbO 3 lattice were analyzed according to changes in optical absorption in the range of OH group absorption. Some properties of crystals doped with Cu during the growth processes were compared to those for specimens doped by thermodiffusion. It was observed that doping with Cu results in an increase of crystal resistance to radiation.

31 citations

Journal ArticleDOI
TL;DR: In this paper, the optical properties of a SrLaGa3O7 crystal doped with Ho3+ ions have been reported and discussed using Judd-Ofelt theory, and the experimental lifetimes for the 5S2, 5F5, 5I6, and 5I7 states have been compared to the theoretical values, calculated using Judd−ofelt theory.

30 citations


Cited by
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Book ChapterDOI
TL;DR: In this paper, the authors present the transition mechanisms for lanthanide ions, namely, the magnetic dipole transition, the induced electric diphole transition, and the electric quadrupole transition.
Abstract: Publisher Summary The intensities of intraconfigurational f–f transitions are reviewed in the chapter The chapter presents the transition mechanisms for lanthanide ions—namely, the magnetic dipole transition, the induced electric dipole transition, and the electric quadrupole transition It discusses the way experimental intensities can be determined from the spectra The chapter also focuses on the expression of the dipole strength and the oscillator strength in oriented and in randomly-oriented systems Correction factors for lanthanide ions in a dielectric medium are described in the chapter Although only a few magnetic dipole transitions exist for the trivalent lanthanide ions, magnetic dipole transitions are of interest, because their intensities are in a first approximation independent of the ligand environment and can, thus, be used as intensity standards The intensity of a magnetic dipole transition can be calculated exactly, provided that suitable wavefunctions are available These wavefunctions can be obtained from diagonalization of the energy matrix

389 citations

Journal ArticleDOI
TL;DR: In this article, the authors review recent advances in the development of novel lasing crystals and ceramics, as well as inorganic and organic nonlinear-laser crystals for χ(3) and cascaded frequency converters.
Abstract: After a brief examination of known insulating laser crystals and the stimulated emission channels of their generating activator ions, this article reviews recent advances in the development of novel lasing crystals and ceramics, as well as inorganic and organic nonlinear-laser crystals for χ(3) and cascaded χ(3) ↔ χ(2) frequency converters Several new modern attractive technologies in the physics and techniques of crystalline lasers are also discussed

358 citations

Journal ArticleDOI
TL;DR: The decay curves are found to be perfectly single exponential for samples with low Dy(3+) ion concentration and the non-exponential decay curves observed for higher concentrations are well fitted to the Inokuti-Hirayama model, which indicates that the energy transfer between the donor and acceptor is of dipole-dipole nature.

139 citations

Journal ArticleDOI
TL;DR: Optical properties of lead borate glasses containing Dy(3+) ions were examined using absorption and luminescence measurements and theoretical calculations based on the Judd-Ofelt framework and the Inokuti-Hirayama model.
Abstract: Optical properties of lead borate glasses containing Dy3+ ions were examined using absorption and luminescence measurements and theoretical calculations based on the Judd–Ofelt framework and the Inokuti–Hirayama model. The luminescence spectra show two characteristic bands at 480 and 573 nm, which are due to 4F9/2–6H15/2 (blue) and 4F9/2–6H13/2 (yellow) transitions of trivalent Dy3+ ions. The yellow/blue luminescence and its decay were analyzed as a function of activator concentration.

135 citations