1998•Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIERequires access
Energy transfer and lasing in LiYbF 4 :Ho, LiYbF 4 :Ho,Tm, and KYb(WO 4 ) 3 crystals
Alexander V. Sandulenko, V. A. Sandulenko, Alexandra M. Tkachuk, Alexandre N. Titov, V. M. Reĭterov, Vladimir N. Ivanov
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Abstract
We have studied both theoretically and experimentally the energy transfer processes in YbLiF4:Ho3+ (0.4%) and YbLiF4:Ho3+ (0.4%),Tm3+ (10%) crystals and in the series of crystals KYb(WO4)2:Tm3+,Ho3+ (0.4%) with the thulium concentration 5; 10; and 20%. The population kinetics of the 5I7 holmium level was studied under the 1.047 micrometers Q-switched YLF:Nd3+ laser pumping. The efficiency of energy transfer processes in Ho3+ doped crystals, codoped with Yb3+ and Tm3+, was demonstrated. With an YbLiF4:Ho3+ (0.4%) laser rod we have obtained lasing at 2.06 micrometers with the total efficiency of 4.8% and the slope efficiency of 11%. In the KYb(WO4)2:Tm3+ (10%),Ho3+ (0.4%) crystal, lasing was obtained for the first time at 2 micrometers . The pumping threshold being approximately 150 mJ, total efficiency 6% and slope efficiency 9.7% was achieved.