Most of the laser applications have to be realized through the interaction of light and matter. The wavelength, energy, polarization, time and space characteristics of the laser are important factors to determine the coupling efficiency of light and matter.
For metals and their alloys, the wavelength of the laser beam is shorter and the absorption rate is higher. However, the difference of the absorption rate is only determined by the initial laser action at the time of welding, and the effect of wavelength on the absorption rate can be ignored when the deep penetration welding process is established. Another wavelength also affect the photo induced plasma formation and laser beam fine focusing degree, Germany in nearly five years of planning will be laser micro manufacturing goal orientation in the new laser source and super fine focus system, corresponding with the ultra short and ultra fast laser source of by attaches great importance to.
The output power of the laser is the most basic index to measure the processing power of the laser. At present, it has been able to provide the highest power CO2 for industrial applications of 45kW lasers. The output power of the YAG laser with multi rod series is 6kW, and the output of the optical fiber coupling can be used.
In addition, many new types of solid state lasers are emerging. For example, 4.4 kW High power diode pumped solid state lasers have supply of goods; sheet type operation of diode pumped solid state lasers, at present single module output power has reached 500W, combination output has reached 4kw; end pumped slab solid state laser is a new type of solid state lasers. The high power fiber laser of the single mode output laser of fiber laser at 1090nm wavelength reaches 2kW, 6kW, 610W has begun to use in the enterprise.
Laser beam material is coupled with the power density (irradiance) than the power itself is more practical significance, because high power density laser manufacturing is the most prominent advantages, only to get enough power density, in order to obtain the ideal quality of processing. At present, high power CO2 laser has two modes of continuous output and high repetition rate pulse output, which can flexibly adapt to different processing tasks.
The beam quality of laser beam is the most important factor in the manufacturing process, and it is the most important factor that can reflect the degree of the "knife".
Laser as a manufacturing "light energy" and "light tool", the laser energy or power, beam quality, the control of light is a measure of manufacturing "light energy" and "light tool" standard. The possibility of laser energy and power characterization of laser manufacturing system processing capacity; beam quality directly limit the possible processing method, possible transmission distance, the size of the focal spot, and the final can get the processing quality; control of light is the condition to realize the industrial application, which is the overall requirements of laser manufacturing system, laser this "the knife" quality, is the industrial application of the "diamond" and laser manufacturing system of laser development, progress important symbol. This is the obvious difference between the laser manufacturing system and the communication laser, medical laser and military laser system