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Soviet Journal of Quantum Electronics

Low-threshold lasing of LiYF4:Pr3+crystals in the 0.72 μm range as a result of flashlamp pumping at 300 K

А. А. Каминский, A.V. Pelevin

Published Aug 31, 1991• 6 citations
Publisher

Abstract

Low-threshold stimulated radiation emitted by Pr3+ ions in an LiYF4 crystal was observed for the first time at 300 K when the crystal was pumped by flashlamp radiation. The wavelength of the emitted radiation was 0.7206 μm and it was due to the 3P0→3P4 transition.
DOI
10.1070/qe1991v021n08abeh003961

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We report the results of detailed investigation of optical superradiance (SR) in LaF3:Pr3+ crystal resonantly excited on the 3P0-3H4(0) transition by laser pulse. When the power of the pumping pulse was higher than a certain threshold, the resonant medium emitted by optical SR pulse on 3P0-3H4(0) transition in the direction of the pumping pulse (as well as in the opposite direction) delayed in time with respect to the pumping pulse. Further increasing of the peak power of the pumping pulse led to the observation of SR on the 3P0-3H6(1) transition also. Thus, the two-color SR in the employed crystal was observed.
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Single-mode cw lasing was obtained for the first time in Yb 3+ : GGG crystals at room temperature at 1.030 and 1.037 μm upon pumping Yb 3+ ions by a 0.925-μm neodymium-doped fibre laser. Lasing was observed at the transitions between the lower Stark sublevel of the 2 F 5/2 level and the upper Stark sublevels of the 2 F 7/2 ground state of Yb 3+ ions. The study of lasing characteristic showed that lasing occurs according to the four-level scheme. The lasing threshold with respect to the absorbed power was 85 mW and the slope lasing efficiency was 20%. Upon 1.7-W pumping, the output power of 310 mW was achieved with the output resonator mirror with the transmission coefficient of 1%. The effective cross section of the lasing transition was 0.9 × 10 -20 cm 2 .