High fluorescence quantum efficiency of 1.8 μm emission in Tm-doped low silica calcium aluminate glass determined by thermal lens spectrometry

Oliveira, S. L.; Lima, S. M.; Catunda, T.; Nunes, L. A. O.; Rohling, J. H.; Bento, A. C.; Baesso, M. L.
January 2004
Applied Physics Letters;1/19/2004, Vol. 84 Issue 3, p359
Academic Journal
In this work, thermal lens spectrometry is performed to determine the fluorescence quantum efficiency (η) of the [sup 3]F[sub 4] level (1.8 μm emission) of 4 and 5 wt % Tm-doped water free low silica calcium aluminate glass. The η value obtained for both high Tm contents was approximately 30%, which is in agreement with the Judd–Ofelt calculation. It is also verified that heat generation under 0.79 μm pumping, which presents a high quantum defect, is minimized by a cross-relaxation mechanism. The high η values, and the excellent chemical and thermomechanical properties indicate this system is a potential host material for diode-pumped laser sources operating in the midinfrared spectral range. © 2004 American Institute of Physics.


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