J. Phys. IV France 04 (1994) C4-403-C4-406
Two step pumped YLF:Tm blue upconversion laserA. KNÜPFER1, E. HEUMANN1, V. OSTROUMOV1, G. HUBER1, V. LUPEI2 and B. CHAI3
1 Universität Hamburg, Institut für Laser-Physik, Jungiusstrasse 11, 20355 Hamburg, Germany
2 Institute of Atomic Physics, Bucharest 76900, Romania
3 Center for Research in Electro Optics and Lasers, CREOL, University of Central Florida, 12424 Research Parkway, Orlando, Florida 32826, U.S.A.
Several fluoride and oxide Tm and (Tm, Yb) doped crystals such as YLF, GLF, YAG, and YAlO3 were tested for pulsed lasing at 1D2 → 3F4 transition (453 nm blue) at room temperature under two step pumping by a Ti:sapphire and a dye laser. Laser operation was obtained for the fluoride crystals. The input-output curves exhibit a saturation effect of emission with respect to both pump lasers. This can be explained by a depletion of the 3H6 ground state of Tm3+ and the competition between the excited state absorption from the 3H4 intermediate level and the mechanisms depopulating this level.
© EDP Sciences 1994