7-11 July 2014
Africa/Johannesburg timezone
<a href="http://events.saip.org.za/internalPage.py?pageId=16&confId=34"><font color=#0000ff>SAIP2014 Proceedings published on 17 April 2015</font></a>

Laser-selective excitation and polarisation studies of BaF<sub>2</sub>: Tm<sup>3+</sup> single crystals

11 Jul 2014, 11:30
D Les 201

D Les 201

Oral Presentation Track A - Division for Physics of Condensed Matter and Materials DPCMM1


Dr Marjorie Mujaji (University of the Witwatersrand)

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Site-selective laser excitation studies of BaF2:Tm3+ single crystals performed at temperatures ranging from 10 K to 75 K are reported. There is a single dominant centre at the dopant concentrations of up to 0.1 mole% used. All the crystal-field energy levels for three multiplets (3H6, 3H4 and 3F2) of the centre and the fluorescence lifetime of the 3H4 multiplet are presented. From polarisation ratio measurements in <111>-oriented crystals the dominant centre is confirmed to be of C3v symmetry, with the charge-compensation interstitial F- ion in the next nearest neighbour position to the Tm3+ ion. Symmetry labels (irrep labels) have been assigned to the crystal-field energy levels. Vibronic coupling is apparent.

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Primary author

Dr Marjorie Mujaji (University of the Witwatersrand)

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