, Volume 83, Issue 2, pp 235-239
Date: 29 Mar 2006

Efficient Yb:KGW lasers end-pumped by high-power diode bars

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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