Here for the first time an high power, high repetition rate, ultra short pulses, Yb doped fiber laser has been used jointly with a trepanning head to carry out hole trepanning trials in 900 µm thick stainless steel L316. Holes with aspect ratio up to 24 have been shown. Holes geometry has been characterized showing a profile which is cylindrical. The trepanning time has been optimized and reduced to 1.5 s. These results show not only the huge potential introduced in material hole trepanning by coupling high power, high repetition rate, fs laser with an innovative trepanning head but also pave the way for the application of laser trepanning in future fields such as automotive and microelectronics.

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