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The quasi-continuous wave (QCW) fiber laser’s peak power and pulse width characteristics are similar to those of the Nd:YAG laser, though the parameter range is not quite as broad. Similar to CW fiber lasers, the QCW lasers offer singlemode to multi-mode options with spot sizes from 0.05 to 1.0 mm as needed for the application. These lasers also shine in small spot size applications and penetration applications, although they do provide a fairly comprehensive coverage of many micro welding applications.