Machining Wood with Light

Results of preliminary tests showed that wood can be machined in a controlled manner using a laser beam. Tests were conducted using a synthetic ruby laser with a maximum energy output of 3.0 joules per pulse. Pulse duration was one millisecond. The material in the beam path was vaporized, with little lateral charring, to form holes about 0.03 inch in diameter. Depth of penetration was from 1/32 to 1/16 inch per pulse. The beam focal point could not be held at the impact point. Vapors trapped in holes reduced the effectiveness of the beam by causing lateral dispersion. Certain conditions must be met for successful application of the method. A continuous beam of high power is required. A method of funnelling energy emitted from lasering material into a parallel beam of a few micro-inches in diameter is needed. An efficient high powered continuous laser source is needed for economic application in wood sawing.

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