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Experimental observation of the nonadditivity of different channels of population-inversion formation at the 4I(11/2)-4I(13/2) transition in the Er(3+) ion in the YSGG:Cr(3+), Er(3+) crystal

Mikhail A. Noginov, G. Q. Sarkissian, В. А. Смирнов, A F Umyskov, Ivan A Shcherbakov

Published Jun 1, 1990• 0 citations
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Energy transfer in a rare earth doped activator-activator system

Evan P. Chicklis, Charles S. Naiman

This report summarizes research carried out to investigate energy transfer in an activator-activator system; that is a system for which energy transfer is reversible between certain metastable levels and for which stimulated emission from each of these levels can be generated. The specific system investigated is Er-Ho:YLF. Laser operation from two different ions in the same solid state host has been demonstrated. The 750nm (5S(2) - 5I(7):Ho) and 850nm (4S(3/2) - 4I(13/2:Er) transitions were observed simultaneously and separately at 77K. Cross transfer between the S levels was also observed and the cross transfer rates measured in crystals of five different compositions. Cross transfer between the S levels is mitigated by other cross relaxation transfer schemes which quench the S level storage time of each ion. Only about 25% of the initial population of one ion is transferred to the other in the optimum concentration, 2%Ho-2%Er, at room temperature. The cross transfer rate is only weakly temperature and concentration dependent; at low temperatures cross transfer is somewhat more effective as the decay rates of each ion are longer.

•Oct 1, 1977•1 citation
This report summarizes research carried out to investigate energy transfer in an activator-activator system; that is a system for which energy transfer is reversible between certain metastable levels and for which stimulated emission from each of these levels can be generated. The specific system investigated is Er-Ho:YLF. Laser operation from two different ions in the same solid state host has been demonstrated. The 750nm (5S(2) - 5I(7):Ho) and 850nm (4S(3/2) - 4I(13/2:Er) transitions were observed simultaneously and separately at 77K. Cross transfer between the S levels was also observed and the cross transfer rates measured in crystals of five different compositions. Cross transfer between the S levels is mitigated by other cross relaxation transfer schemes which quench the S level storage time of each ion. Only about 25% of the initial population of one ion is transferred to the other in the optimum concentration, 2%Ho-2%Er, at room temperature. The cross transfer rate is only weakly temperature and concentration dependent; at low temperatures cross transfer is somewhat more effective as the decay rates of each ion are longer.