Green up-conversion laser emission in Er-doped crystals at room temperature
R. BredeInstitut für Laser-Physik, Universität Hamburg, Jungiusstrasse 9-11, 2000 Hamburg 36, GermanyE. HeumannInstitut für Laser-Physik, Universität Hamburg, Jungiusstrasse 9-11, 2000 Hamburg 36, GermanyJ. KoetkeInstitut für Laser-Physik, Universität Hamburg, Jungiusstrasse 9-11, 2000 Hamburg 36, GermanyT. DangerInstitut für Laser-Physik, Universität Hamburg, Jungiusstrasse 9-11, 2000 Hamburg 36, GermanyG. HüberInstitut für Laser-Physik, Universität Hamburg, Jungiusstrasse 9-11, 2000 Hamburg 36, GermanyB. H. T. ChaiCenter for Research in Electro Optics and Lasers, University of Central Florida, Orlando, Florida 32826
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We report room-temperature pulsed up-conversion laser oscillation in Er-doped LiYF4 and KYF4 at 551 and 562 nm, respectively. In both crystals laser oscillation is observed on the 4S3/2-4I15/2 ground state transition. Excitation was provided by a tunable flashlamp-pumped Ti:sapphire laser in the spectral region around 810 nm. Additional pumping with a continuous wave krypton ion laser at 647 nm was beneficial to both lasers. Laser action has also been observed in Er-doped Y3Al5O12 on the same transition.
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