Laser Beam Micro Welding With High Brilliant Fiber Lasers

Abstract

The use of lasers in the processing of solar cell structures has been known for many years both for c-Si and thin-film solar technologies. The maturity of the laser technology, the increase in scale of solar module production and the pressures to drive down cost of ownership and increase cell efficiencies have all contributed to the adoption of laser processes in industrial manufacturing. Today laser systems are the tool of choice in thin-film module manufacturing both for scribing the cell interconnects and for the module edge isolation. For c-Si solar cells the primary laser application today is edge isolation and this is well-established in industrial production of most types of waferbased cells. Other laser processes are used in the production of advanced high-efficiency c-Si cell designs such as laser grooved buried contacts, emitter wrap-through or metal wrap-through interconnects, selective emitters and laser fired contacts. In the mission of the solar industry to reduce the cost of electricity generation there are increasing opportunities for laser processing to contribute to the goal of low cost of ownership in industrial manufacturing through improved module efficiencies, higher throughput and reduced process costs.

Study of a Welding Pool Harmonic Oscillations Influence on the Welded Metal Hardness and Weld Bead Width

“…The method of imposing oscillations (vibrations) can be mechanical, i. e. when the weld pool [1][2][3][4][5][6][8][9][10] or the welding tool [2,7] oscillates during the process of welding or surfacing; the use of modulated welding current (pulsed current) [11]; periodic influence of an external magnetic field [12], which in a certain way influences the melt of the weld pool, the welding arc [13] or the laser beam [14].…”

Measurement system with high accuracy for laser beam quality

“…With the continuous development of laser technology and its wide applications in various fields [1][2][3], laser beams with high quality are desired. For different applications, there are some different evaluation criteria, such as far-field divergence angle, Strehl ratio [4], power in the bucket [5][6][7], and beam quality β-factor [7].…”

Optimization of the Laser Hardening Process by Adapting the Intensity Distribution to Generate a Top-hat Temperature Distribution Using Freeform Optics

“…With increasing beam quality the frequency gets higher, which is necessary to prevent melting on the surface [10,25]. Although 27 years have gone by since Burger made these first calculations, oscillating frequencies above 1 kHz are still challenging for galvanometric scanners, especially when the size of the mirrors has to be large to resist the necessary high laser power and when the amplitude of the tracks gets larger [27].…”

“…Coatings 2017, 7,77 calculations, oscillating frequencies above 1 kHz are still challenging for galvanometric scanners, especially when the size of the mirrors has to be large to resist the necessary high laser power and when the amplitude of the tracks gets larger [27].…”