Laser diodes are used in a variety of applications by taking advantage of their features such as directivity, small spot size (um ~), monochromaticity, high optical density, and coherent. More recently, motion sensors, HDDS, thermo-assisted magnetic recording, and lighting (projectors, headlights) are also being used. These beam characteristic parameters are not independent, but affect each other. For the same power laser beam, the better the quality of the beam, the smaller the focal point and the greater the power density of the focal point. The same laser, using a short focal length focusing lens, can get a smaller focus and a larger focus power density, but resulting in large aberration, lens processing is difficult, short focus is also easy to make focus lens pollution. In the field of material processing, the initial pulse laser is the transition product of the continuous laser, which is due to the early by the core components of the bearing capacity, process level and other factors, the output power of the continuous laser can not be very high, can not heat the material to the melting point above so as to achieve the purpose of processing; If through certain technical means, the laser output energy is concentrated on a single pulse, so that although the total power of the laser does not change, but the instantaneous power at the time point of pulse occurrence is greatly improved, to meet the demand of material processing. Later continuous laser technology gradually mature, people found that pulse laser has a great advantage in processing accuracy, which is mainly due to the thermal effect of pulse laser on the material is smaller, and the narrower the laser pulse width, the smaller the thermal effect, the more smooth the edge of the processed material (the corresponding processing accuracy is higher).
In the field of material processing, the initial pulse laser is the transition product of the continuous high powered laser, which is due to the early by the core components of the bearing capacity, process level and other factors, the output power of the continuous laser can not be very high, can not heat the material to the melting point above so as to achieve the purpose of processing; If through certain technical means, the laser output energy is concentrated on a single pulse, so that although the total power of the laser does not change, but the instantaneous power at the time point of pulse occurrence is greatly improved, to meet the demand of material processing. Later continuous laser technology gradually mature, people found that pulse laser has a great advantage in processing accuracy, which is mainly due to the thermal effect of pulse laser on the material is smaller, and the narrower the laser pulse width, the smaller the thermal effect, the more smooth the edge of the processed material (the corresponding processing accuracy is higher).
