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Fiber laser promotes product technology progress

turnover time :2020-06-18 10:02:52
Fiber laser is recognized as a driving force in many industries, because of its throughput, reliability and low operating cost, it can be used for cutting, welding, marking and micromachined materials. Specific design elements distinguish fiber lasers from industrial laser sources, and their unique properties make breakthrough manufacturing process capabilities possible. Specifically, high-power single-mode lasers and flexible pulsed fiber lasers for remote welding can meet different process challenges by electronically controlling operating parameters.
Fiber lasers perform well in converting relatively low brightness pump light from laser diodes to high brightness output, which is usually the only spatial mode allowed by fiber design physics. Even if the fiber laser can 
As early as the 1990s, the output power was very high (100 W). After the collapse of the fiber communication market in 2001, reliable fiber lasers were commercialized. In the 1990s, the company spent billions of dollars to solve the fundamental problem of coupling diodes to high reliability optical fibers and splicing high-power density optical fibers, so that the component technology can meet the 25 year reliability requirements of undersea communications, and reduce these costs. High performance, high reliability components. 
Then, in the early 2000s, with the disappearance of the communications market, technology investment shifted rapidly and was adjusted to industrial fiber laser design. 
Fiber lasers are unique among all types of industrial lasers because they have two properties: a sealed cavity and a single-mode guided wave medium. Through the design, the modern fiber laser has a completely sealed optical path, which is free from environmental pollution, and can maintain optical alignment without adjustment. All internal components are fiber coupled or gas tight fiber coupled, and the only free space interface appears on the beam transmission optics. The assembly includes a fused beam expander to reduce the strength at the first free space interface. The active optical path is usually in a fiber waveguide, which allows only one spatial mode to propagate (the current optical power is as high as 2 kW).
High power fiber laser combines single-mode modules into high brightness transmission fiber in fused fiber combiner. The combination of a single-mode waveguide and a fully sealed optical cavity provides a reliable laser design that can be fixed and measured at the time of manufacture with minimal change in time and temperature. Sealed pump diodes and non bare fiber technology can produce lasers that can be produced continuously for many years without adjustment or degradation of performance. 
At the power levels of 4 to 8 kW commonly used in many metal cutting and welding markets, the comparison between fiber lasers and disk lasers is basically academic. From a user's point of view, both offer almost the same power, beam quality, wavelength, reliability, and beam propagation options. The selection of lasers in this power range will be based on commercial considerations of service and support as well as value-added features, all independent of the underlying resonator technology. Successful fiber laser manufacturers have solved the engineering problem of fusing glass to withstand the strength of molten or ablative metals, and successful disk laser manufacturers have solved sophisticated optical mechanical thermal design to provide stable high brightness output.
Disk laser is not a sealed cavity, so it has several basic advantages compared with fiber laser. The high efficiency of intracavity frequency conversion makes the disk perform better when generating harmonic frequencies (green and ultraviolet wavelengths). In addition, cavity design for ultra fast (picosecond and femtosecond) lasers is simpler. Compared with fiber laser, disk laser can achieve higher peak power and higher pulse energy. This is due to the fact that fiber lasers must be designed within the limits of competing nonlinear effects, such as stimulated Brillouin scattering, which occur due to the cumulative interaction length of the fiber waveguide. 
Battery manufacturing involves the connection of foil and sheet metal at all stages, from bags to batteries to complete battery components. Compared with ultrasonic and resistance welding, laser welding is becoming more and more popular due to productivity and welding strength. In addition, laser welding is a non-contact process, which does not involve tool wear. By taking advantage of the brightness and dynamic capabilities of fiber lasers, the specific challenge of connecting different metals previously considered non weldable can be solved (1).
The fiber laser, which provides a single spatial mode output power of more than 1 kW, has the required brightness and can take advantage of the speed of the current detection scanning head and the tool path flexibility. The Gauss intensity distribution allows effective reflection and even reflection of the metal, and the high-speed point movement of the scanning head limits the melting state of the weld, thus reducing the formation of brittle intermetallic compounds when joining dissimilar metals.
In addition, spirals or swings are applied to the movement of the points to "stir" the molten weld to the required weld width to achieve the required weld strength and conductivity.
Until recently, single-mode lasers have not been able to produce enough wide and strong welds in single line welds. However, high brightness and intensity parameters can be set using Gaussian beam technique at the same time.

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