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Multi Mode

Lasers are said to operate in either 'Single Mode' or 'Multi Mode.' 

Multi-mode fiber lasers generally utilize fibers with core diameters between 50 – 300 microns resulting in lower intensity, uniform, “flat top” beams which promote an enlarged melt zone in line with many welding requirements.

 
Single mode and multi mode beam profiles
 

For more information, read our blog Fiber Laser Micro Welding: Single Mode or Multi Mode?