17 April 2006 Effects in the population inversion of 3H4 level in Tm, Tm-Tb, and Tm-Eu doped germanate glasses for amplifiers applications
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Abstract
The population inversion of the Tm3+ in GLKZ glass involved in the 1470 nm emission (3H4-> 3F4) as a function of Tb (or Eu) concentration was calculated by computational simulation for a CW laser pumping at 792 nm. These calculations were performed using the experimental Tm->Tb an Tm->Eu transfer rates and the spectroscopic parameters of the Tm (0.1 mol%) system. The result shows that 0.2 mol% (Tb3+) and 0.4 mol % of Eu3+ ions propitiate best population inversion of Tm3+ (0.1 mol %) maximizing the amplification coefficient of germanate (GLKZ) glass when operating as laser intensity amplification at 1470 nm. Besides the effective deactivation of the 3F4 level, the presence of Tb3+ or Eu3+ ions introduce a depopulation of the 3H4 emitting level by means of a cross relaxation process with Tm3+ ions. In spite of this, the whole effect is verified to be benefic for using Tm-doped GLKZ glass codoped with Tb3+ or Eu3+ as a suitable material for confectioning optical amplifiers that operates in the S-band for telecommunication. PACS code: 78.50, 78.55, 71.55
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A. F. H. Librantz, A. F. H. Librantz, L. Gomes, L. Gomes, G. Pairier, G. Pairier, S. J. L. Ribeiro, S. J. L. Ribeiro, Y. Messaddeq, Y. Messaddeq, "Effects in the population inversion of 3H4 level in Tm, Tm-Tb, and Tm-Eu doped germanate glasses for amplifiers applications", Proc. SPIE 6190, Solid State Lasers and Amplifiers II, 61901G (17 April 2006); doi: 10.1117/12.684771; https://doi.org/10.1117/12.684771
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