A. A. KORNIENKO et (b), and E. B. DUNINA (a) To describe the experimental data of the line strength and the oscillator strength of electric dipole transition between manifolds a formula is suggested that takes into account the dependence on the energy of manifolds and the effect of electron correlation. It contains four phenomenological parameters and is applied to describe the experimental data of P i + in KPrP4012. It is shown that the dependence of the line strength on the energy of manifolds improves essentially the description of 3H4 + 3P2 transition.

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Europium-doped monoclinic potassium gadolinium tungstate KGd(WO 4 ) 2 crystals are grown by the top-seeded solution growth (TSSG) technique. Their absorption spectra are studied in detail for principal light polarizations, E N p , N m and N g . It is accompanied by determination of absorption oscillator strengths by means of the theory of f-f transition intensities for systems with anomalously strong configuration interaction. Spectral and temporal characteristics of luminescence associated with 5 D 0 → 7 F J transitions are analyzed, and luminescence branching ratios and the radiative lifetime of the 5 D 0 state are determined. Stimulated-emission cross-section spectra are evaluated for Eu:KGd(WO 4 ) 2 crystal. Pulsed Eu:KGd(WO 4 ) 2 lasers operating at room temperature at the wavelength of 702.8 nm ( 5 D 0 → 7 F 4 transition) are studied at Eu concentration of 10/25 at.%. Under laser pumping at 533.6 nm, a maximum output energy of 570 µJ is obtained. The main limitation for laser operation at 5 D 0 → 7 F 2 transition is strong excited-state absorption via the 5 D 0 → 5 F 4 channel.

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