In order to be able to start cutting from somewhere other than the edge, a pierce is done before every cut. Depending upon material thickness, kerf widths as small as 0.004 inches (0.10 mm) are possible. The narrowest part of the focused beam is generally less than 0.0125 inches (0.32 mm) in diameter. Mirrors or fiber optics are typically used to direct the coherent light to a lens, which focuses the light at the work zone. As the lasing material is stimulated, the beam is reflected internally by means of a partial mirror, until it achieves sufficient energy to escape as a stream of monochromatic coherent light. Generation of the laser beam involves stimulating a lasing material by electrical discharges or lamps within a closed container. Industrial laser cutting of steel with cutting instructions programmed through the CNC interface
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