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2. Focusing of high power single mode laser beams;Abt,2008
3. Online focus shift measurement in high power fibre laser welding;Reitemeyer,2010
4. Fundamental understanding of spatter behaviour at laser welding of steel;Weberpals,2008
5. The effect of spot size and laser beam quality on welding performance when using high-power continuous wave solid-state lasers;Verhaeghe,2005