A method for creating a perforation in a substrate , comprising: directing a laser beam from a laser ; rotating a first polygon mirror comprising a plurality of faces that are disposed on a perimeter of said first polygon mirror ; reflecting said laser beam from a face of said plurality of faces ; removing material from said substrate , after said reflecting step, by impacting said laser beam on said substrate ; repeating said reflecting and removing steps a plurality of times to define a first perforation in said substrate ; and being characterised by : defining a first plurality of perforations on said substrate using said repeating step, wherein each perforation of said first plurality of perforations is spaced from a remainder of said first plurality of perforations , and wherein said first plurality of perforations comprises said first perforation ; and in that: an optical system comprises said first polygon mirror and said laser , wherein said optical system is in a first position for said defining a first plurality of perforations step, said method being further characterised by : moving said optical system from said first position to a second position; and defining a second plurality of perforations on said substrate using said repeating step, wherein each perforation of said second plurality of perforations is spaced from a remainder of said second plurality of perforations , wherein said first plurality of perforations and said second plurality of perforations are defined in non-overlapping portions of said substrate , and wherein said optical system is in said second position for said defining a second plurality of perforations step. directing a laser beam from a laser ; rotating a first polygon mirror comprising a plurality of faces that are disposed on a perimeter of said first polygon mirror ; reflecting said laser beam from a face of said plurality of faces ; removing material from said substrate , after said reflecting step, by impacting said laser beam on said substrate ; repeating said reflecting and removing steps a plurality of times to define a first perforation in said substrate ; and being characterised by : defining a first plurality of perforations on said substrate using said repeating step, wherein each perforation of said first plurality of perforations is spaced from a remainder of said first plurality of perforations , and wherein said first plurality of perforations comprises said first perforation ; and in that: an optical system comprises said first polygon mirror and said laser , wherein said optical system is in a first position for said defining a first plurality of perforations step, said method being further characterised by : moving said optical system from said first position to a second position; and defining a second plurality of perforations on said substrate using said repeating step, wherein each perforation of said second plurality of perforations is spaced from a remainder of said second plurality of perforations , wherein said first plurality of perforations and said second plurality of perforations are defined in non-overlapping portions of said substrate , and wherein said optical system is in said second position for said defining a second plurality of perforations step. <EOS>