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Pulsed lasers are as popular as continuous wave (CW) lasers. The physics of many lasers lends itself to pulsed operation, and just as important, so do many applications. Pulse widths are becoming very short, reaching femto-seconds. When concentrating the laser energy into such short pulses and onto a small spot, even low pulse energy - in the μJ range - is sufficient to melt, cut, ablate, and weld materials without the effect of slowly heating and damaging adjacent areas. While pulsed lasers exist in many wavelengths from UV to IR, UV lasers have some unique applications in material processing and medicine, due to the high absorption of UV in many materials and the high photon energy at short wavelengths.

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