| Autor: |
Th. Huber, Pavel Alexeevich Studenikin, Alexander I. Zagumennyi, H.P. Weber, C. P. Wyss, P.J. Morris, Ivan A Shcherbakov, A. F. Zerrouk, Willy Lüthy, Yu. D. Zavartsev, M. Kehrli |
| Rok vydání: |
1999 |
| Předmět: |
|
| Zdroj: |
Journal of Luminescence. 82:137-144 |
| ISSN: |
0022-2313 |
| DOI: |
10.1016/s0022-2313(99)00031-9 |
| Popis: |
The transition from the thulium : 1 G 4 level into the ground state is a candidate for the construction of a IR pumped blue upconversion laser. We report on the excitation of the Tm : 1 G 4 level in the Yb : Tm doped crystals GdAlO 3 , LiGd(MoO 4 ) 2 , Y 3 Sc 2 Ga 3 O 12 and Gd 3 Ga 5 O 12 . The fluorescence spectra are measured in a range from 300 to 2300 nm. The lifetimes of the Tm : 1 G 4 , Tm : 3 H 4 and Yb : 2 F 5/2 levels are determined as a function of the dopant concentrations. Furthermore, energy transfer from thulium to terbium is discussed. The results are evaluated in view of the construction of an efficient blue thulium upconversion laser. From the investigated crystals, Y 3 Sc 2 Ga 3 O 12 proves to be the most suitable host. Comparison of the measured data with values from the literature suggests that Y 3 Sc 2 Ga 3 O 12 is an even more promising crystal than the low phonon host LiYF 4 . It is shown that the optimum thulium concentration is of the order of 0.1 at% for a ytterbium concentration of 10 at%. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect