Analysis on Industrial Application of Laser Fine Processing

With the development of ultrafast laser technology, its technological breakthroughs have brought hope to the fine processing industry. In the field of fine processing, femtosecond lasers are replacing picosecond lasers as the hottest topic. In this paper, combined with the development process of laser fine processing, the application of femtosecond laser is mainly described.　　1. Introduction　　 Since the birth of the first ruby u200bu200blaser in 1960, people have never stopped exploring laser technology. Lasers are becoming more and more known for their superior characteristics, and more applications have been discovered, especially in industrial fields that are more sensitive to high-tech. At the current stage of the development of human society, industrial demand is a powerful driving force for social development. Laser has been used in industrial processing for more than 20 years, and its depth and breadth have reached a certain stage.　　2. Laser processing industry　　At the beginning of the birth of the first laser, the power was low and the system as a whole was large, and it could not be directly applied to the industrial processing field. In the following decades, with the development of laser technology and the emergence of new types of laser media, the bottleneck of laser technology has continuously broken through, and lasers have made great progress in both depth and breadth. There are numerous applications of laser in industry, such as laser printing, burning, marking, engraving, welding, (laser cutting machine) cutting, texturing, resistance adjustment, welding, etc., and the potential is huge.　　From the perspective of depth, the development of the laser processing industry has mainly experienced three stages since the 1980s: 　　The first stage is the nanosecond (1nsu003d10-9s) laser application stage. The peak power of the nanosecond pulse obtained by the Q-switching technology is much higher than the average power, which can achieve a high instantaneous power density that cannot be achieved by a continuous laser, thereby exceeding the material damage threshold instantaneously and achieving an etching effect.　　 The second stage is the beginning of this century. The semiconductor saturable absorption mirror (SESAM) has enabled the rapid development of picosecond (1psu003d10-12s) laser technology and will soon be used in industry. Picosecond lasers have always been mode-locked by dyes, but the dyes need to be cycled and are often bleached easily, which affects the stability of the mode-locking. SESAM can not only replace the dye for mode locking, but also can realize self-starting. In this context, many commercial industrial-grade picosecond lasers have emerged rapidly.　　 Compared with nanosecond lasers, picosecond lasers can achieve finer processing effects with their shorter pulse width and higher peak power. For a time, fine processing became a hot topic.　　 However, in the third stage, the real fine processing is realized under the femtosecond (1 fsu003d10-15 s) laser.