We present a comparative study of the spectroscopic properties of Tm in several crystalline hosts: YAlO₃, Y₃Al₅O₁₂, La₂Be₂O₅, and LiYF₄. These materials were experimentally characterized in the spectral region accessible to laser diodes, especially in the context of advantages of pumping at 685 rather than 785 nm. Using the Fuchtbauer–Ladenburg equation, we also calculate the emission cross-section spectra from the experimentally measured fluorescence spectra, in the vicinity of the ³F₄–³H₆ and ³H₄–¹³H₅ transitions. The lifetimes of the ³F₄– and ³H₄– multiplets at room temperature were measured experimentally. We finally report, for the first time to our knowledge, absorption lines for different optical transitions of Tm in La₂Be₂O₅.

© 2000 Optical Society of America

[Optical Society of America ]

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