The present invention discloses a seamless pad-type filter which is characterized in that it comprises two co-extensive sides, a top side and a bottom side. In an embodiment, the headgear comprises a protective shell having a curvilinear surface, wherein the curvilinear surface is positioned to overlie at least a portion of the cranium of an infant, to thereby prevent the infant from resting its head on the regions of the skull underneath the surface of the shell. The inflatable bladder provides support for the substrate while attempting to prevent injury to components by pliably conforming to component irregularities on the back side of the substrate. The amplified pulse light is incident on the cylindrical lenses through one of the plurality of non-linear optical crystals and is incident on a different one of the plurality of non-linear optical crystals from the one non-linear optical crystal through the cylindrical lenses.