Efficient Yb:KGW lasers end-pumped by high-power diode bars |
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| Authors: | J.E. Hellström S. Bjurshagen V. Pasiskevicius J. Liu V. Petrov U. Griebner |
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| Affiliation: | (1) Department of Physics, Royal Institute of Technology, Stockholm, 10044, Sweden;(2) Max-Born Institute, Max-Born Strasse 2A, 12489 Berlin, Germany |
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| Abstract: | The laser performance of Yb:KGW under end-pumping with high-power diode bars has been investigated. In one configuration, the pump is delivered through an optical fiber yielding a symmetric but unpolarized pump spot. In the second configuration, the pump is delivered through an optical lens system yielding a polarized but asymmetric pump spot. Both configurations resulted in a maximum optical to optical efficiency of 47% and a maximum power of 12.4 W has been generated with the fiber coupled pump source. The output power was limited by crystal fracture, which occurred at an estimated temperature gradient of 1.2×105 K/m. Thermal lensing and laser tuning characteristics are also investigated. PACS 42.55.Xi; 42.60.Lh |
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