Efficient upconversion-pumped continuous wave Er3+:LiLuF4 lasers |
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| Affiliation: | 1. Institut für Laser-Physik, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany;2. Center for Free-Electron Laser Science, DESY, Notkestraße 85, 22607 Hamburg, Germany;3. The Hamburg Centre for Ultrafast Imaging, Luruper Chaussee 149, 22761 Hamburg, Germany;1. National Institute for Laser, Plasma and Radiation Physics, 409 Atomi?tilor Street, 077125 M?gurele-Ilfov, Romania;2. University of Bucharest, Faculty of Physics, 405 Atomi?tilor Street, 077125 M?gurele-Ilfov, Romania;1. School of Materials Sciences and Technology, China University of Geosciences, Beijing 100083, China;2. School of Materials Sciences and Engineering, University of Science and Technology Beijing, Beijing 100083, China;1. National Institute for Laser, Plasma and Radiation Physics, 409 Atomi?tilor Street, 077125 M?gurele-Ilfov, Romania;2. University of Bucharest, Faculty of Physics, 405 Atomistilor Street, 077125 M?gurele-Ilfov, Romania;1. Institute of Physics, University of Tartu, 50411 Tartu, Estonia;2. Skobeltsyn Institute of Nuclear Physics, Moscow State University, 119991 Moscow, Russia;3. Nikolaev Institute of Inorganic Chemistry, SB RAS, Novosibirsk 630090, Russia;4. Sobolev Institute of Geology and Mineralogy, SB RAS, Novosibirsk 630090, Russia;5. Institute of Light and Matter, CNRS, University Lyon1, Villeurbanne 69622, France;1. National Institute for Laser, Plasma and Radiation Physics, 409 Atomi?tilor Street, 077125 M?gurele-Ilfov, Romania;2. University of Bucharest, Faculty of Physics, 405 Atomistilor Street, 077125 M?gurele-Ilfov, Romania |
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| Abstract: | We report on detailed spectroscopic investigations and efficient visible upconversion laser operation of Er3+:LiLuF4. This material allows for efficient resonant excited-state-absorption (ESA) pumping at 974 nm. Under spectroscopic conditions without external feedback, ESA at the laser wavelength of 552 nm prevails stimulated emission. Under lasing conditions in a resonant cavity, the high intracavity photon density bleaches the ESA at 552 nm, allowing for efficient cw laser operation.We obtained the highest output power of any room-temperature crystalline upconversion laser. The laser achieves a cw output power of 774 mW at a slope efficiency of 19% with respect to the incident pump power delivered by an optically-pumped semiconductor laser. The absorption efficiency of the pump radiation is estimated to be below 50%.To exploit the high confinement in waveguides for this laser, we employed femtosecond-laser pulses to inscribe a cladding of parallel tracks of modified material into Er3+:LiLuF4 crystals. The core material allows for low-loss waveguiding at pump and laser wavelengths. Under Ti:sapphire pumping at 974 nm, the first crystalline upconversion waveguide laser has been realized. We obtained waveguide-laser operation with up to 10 mW of output power at 553 nm. |
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| Keywords: | Laser materials Upconversion lasers Waveguide lasers |
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