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Elastic properties of KGd(WO4)2 : Ho3+ single crystals studied by Brillouin spectroscopy

Dobroslawa Kasprowicz 1Slawomir Mielcarek 2Aleksandra Trzaskowska 2Andrzej Majchrowski 3Edward Michalski 3Miroslaw Drozdowski 1

1. Pozna University of Technology (PUT), Nieszawska 13A, Poznań 60-965, Poland
2. Adam Mickiewicz University, Faculty of Physics (AMU), Umultowska 85, Poznań 61-614, Poland
3. Military University of Technology (WAT), Kaliskiego 2, Warszawa 00-908, Poland


Potassium gadolinium tungstate crystals KGd(WO4)2 doped with rare earth ions are very attractive solid-state laser materials [1]. It was found that KGd(WO4)2 crystals activated with trivalent lanthanide Ln3+ ions show high efficiency for stimulated emission at low pumping energies under laser diode excitation [2]. The crystal structure, optical and spectroscopic properties of pure and many Ln3+ ions doped KGd(WO4)2 crystals have been already described [3]. However, it is still a little known on their elastic properties at hypersonic frequencies.

Investigated pure and holmium doped KGd(WO4)2 single crystals were obtained by means of the Top Seeded Solution Growth method from K2W2O7 solvent [4].

The Brillouin spectra of KGd(WO4)2 : Ho3+ crystals were collected at room temperature for the [100], [010], [001], [110], [-110], [011], [0-11], [101] and [-101] acoustic phonons in 90o and 180o scattering geometries. Some additional configurations of measurements have been applied for refractive indices determination. Using the measured frequencies of the acoustic phonons propagating in the main crystallographic directions the velocities of the proper elastic waves have been calculated. For investigated KGd(WO4)2 : Ho3+ crystals the values of elastic constants C22 C44 C66 and C46 associated with the longitudinal and transverse acoustic phonons propagating along the a and b crystallographic axes and the direction perpendicular to ab plane have been calculated. We compared the obtained values of the elastic constants with the proper values of the elastic constants determined for KGd(WO4)2 crystals [5]. The obtained results show that the elastic properties of KGd(WO4)2 : Ho3+ crystals are affected by the doping by Ho3+ ions.


This work was financed by the Research Project: MNiI 1 PO3B 058 27.

[1] A. A. Kaminskii, A. F. Konstantinova, V. P. Orekhova, A. V. Burtashin, R. F. Klevtsova, A. A. Pavlyuk, Crystallography Reports, 46 (2001) 665 – 672.

[2] M. C. Pujol, M. Aguilό, F. Díaz, C. Zaldo, Optical Mater., 13 (1999) 33.

[3] M. C. Pujol, M. Rico, C. Zaldo, R. Sole, V. Nikolov, X. Solans, M. Aguilo, F. Díaz, Appl. Phys. B, 68 (1999) 187 – 197.

[4] A. Majchrowski, M. T. Borowiec, E Michalski, J. Cryst. Growth, 264 (2004)201.

[5] D. Kasprowicz, S. Mielcarek, A. Majchrowski, E. Michalski, M. Drozdowski, Cryst. Res. Technol., 41(2006)541.


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Presentation: Poster at Joint Fith International Conference on Solid State Crystals & Eighth Polish Conference on Crystal Growth, by Dobroslawa Kasprowicz
See On-line Journal of Joint Fith International Conference on Solid State Crystals & Eighth Polish Conference on Crystal Growth

Submitted: 2007-01-15 19:30
Revised:   2009-06-07 00:44