A. M. Belovolov, M. I. Belovolov, E. M. Dianov, V. V. Dudin, M. I. Timoshechkin, “CW lasing in Yb<sup>3+</sup> : GGG crystals pumped at 0.925 μm”, Kvantovaya Elektronika, 2006, Volume 36, Number 7,Pages <nobr>587

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SPECIAL ISSUE DEVOTED TO THE 90TH ANNIVERSARY OF A.M. PROKHOROV

CW lasing in Yb³⁺ : GGG crystals pumped at 0.925 μm

A. M. Belovolov^a, M. I. Belovolov^a, E. M. Dianov^a, V. V. Dudin^a, M. I. Timoshechkin^b

^a Fiber Optics Research Center of the Russian Academy of Sciences, Moscow
^b Prokhorov General Physics Institute of the Russian Academy of Sciences, Moscow

Abstract: Single-mode cw lasing was obtained for the first time in Yb³⁺ : GGG crystals at room temperature at 1.030 and 1.037 μm upon pumping Yb³⁺ ions by a 0.925-μm neodymium-doped fibre laser. Lasing was observed at the transitions between the lower Stark sublevel of the ²F_5/2 level and the upper Stark sublevels of the ²F_7/2 ground state of Yb³⁺ 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 cm².

PACS: 42.55.Rz, 42.60.Lh, 42.70.Hj

Received: 12.04.2006