In recent years, with the continuous improvement of industrial technology demand, the requirements for processing tools have become increasingly high, and the development direction of micro precision laser welding tools has also approached market demand, moving towards the field of ultra high speed lasers. Led by nanosecond laser cutting, with the development of picosecond laser welding machines and femtosecond laser welding machines, meeting market demand.

Nanoseconds, picoseconds, and femtoseconds are measured in units of time, with 1 second=103 milliseconds=106 microseconds=109 nanoseconds=1012 picoseconds=1015 femtoseconds. Picosecond laser welding machines and nanosecond laser welding machines refer to the single pulse duration of laser in the picosecond and nanosecond time range, which refers to the pulse width of laser. Laser processing methods use high-energy laser beams to concentrate and irradiate the surface of materials, causing physical or chemical reactions to form cutting. Essentially, it is a thermal processing method, but due to the short duration, usually within a few nanoseconds, the area affected by heat is small, which can ensure processing effect and speed.

In today's mainstream market, the commonly used laser processing tool is nanosecond laser. With the improvement of industrial technology requirements, the thermal effects within the nanosecond laser range have expanded, and the adverse effects caused by thermal effects cannot be accepted by the market. New laser processing tools have emerged. Meets the demands of the mayor/market, and is also a technological breakthrough in the laser industry. The industry refers to it as a micro precision ultra high speed laser processing system.

The picosecond laser welding machine has ultra short wave pulse time, and the single pulse action time is only a few picoseconds, so the thermal impact is very small and can be ignored. Compared with the processing of nanosecond laser welding machines, there is no remanufactured material in the entire processing process, the processing is clean, and the absorption of laser energy is less dependent on the material or wavelength. Therefore, in the field of micro precision laser processing, the picosecond laser welding machine and femtosecond laser welding machine of the ultra high speed laser processing system provide a broad space, and their processing characteristics are bound to occupy an important position in the future.

Comparison of Processing Effects between Nanosecond Laser and Picosecond Laser

The processing effect and processing speed of picosecond laser welding machine are superior to nanosecond laser. In the field of mayor/market applications, picosecond laser also has a broad space to do things that cannot be done in the nanosecond level time range, including solar cell laser etching (narrower line width), OLED laser cutting (smaller collapse), and brittle material laser drilling (faster speed). In the figure, we found that the heat affected area and heat affected operation time of the material in the nanosecond range are short, with high accuracy and faster processing speed.

Due to its low thermal performance, cold melting, and high precision, the ultra high speed picosecond laser welding machine has extraordinary performance in materials such as stainless steel, aluminum, titanium alloy, sapphire, ceramics, glass, etc. It has an absolute darling like position in scientific research, biological instruments, solar cells, electronic product manufacturing, semiconductor manufacturing, and other fields.

Of course, currently the mainstream laser processing market is still dominated by nanosecond lasers, due to the high cost of picosecond ultra high speed laser welding machines. The future trend should develop towards femtosecond and femtosecond fields, and the future is worth looking forward to.