Efficient Yb:KGW lasers end-pumped by high-power diode bars
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- Hellström, J., Bjurshagen, S., Pasiskevicius, V. et al. Appl. Phys. B (2006) 83: 235. doi:10.1007/s00340-006-2171-8
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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.