Uploaded May 2021 | Updated September 2026, 1 week ago
During the past few sessions I have been trying to prove that there is something other than the traditional focal point that is responsible for the the cutting behaviour that all lenses exhibit.
The commonly held view to date that the increased focal range that happens as the focal length increases is somehow responsible for that cutting depth increase. This is transparently illogical when you see me cutting 26mm deep hardwood with a 2.5" lens. That lens has a focal depth of less than 2mm!!!!. I have developed a theory based on observation and reverse engineering that explains what ACTUALLY happens as the laser beam pases through a lens and after several sessions of experiments and tests I have demonstrated the credibility of that theory. This session finally demonstrates that removing the central axis of a lens has no impact on its engraving properties. I also prove that removing those engraving properties still leaves a lense with cutting ability and that cutting ability comes from a second thin axial beam that focuses at some point beyond the normal focal point. It is this "leakage" path that allows a thin focused beam of intense light to damage material BELOW the focal point.
During the past few sessions I have been trying to prove that there is something other than the traditional focal point that is responsible for the the cutting behaviour that all lenses exhibit.
The commonly held view to date that the increased focal range that happens as the focal length increases is somehow responsible for that cutting depth increase. This is transparently illogical when you see me cutting 26mm deep hardwood with a 2.5" lens. That lens has a focal depth of less than 2mm!!!!. I have developed a theory based on observation and reverse engineering that explains what ACTUALLY happens as the laser beam pases through a lens and after several sessions of experiments and tests I have demonstrated the credibility of that theory. This session finally demonstrates that removing the central axis of a lens has no impact on its engraving properties. I also prove that removing those engraving properties still leaves a lense with cutting ability and that cutting ability comes from a second thin axial beam that focuses at some point beyond the normal focal point. It is this "leakage" path that allows a thin focused beam of intense light to damage material BELOW the focal point.
