Application of Subnanosecond Microchip Laser in Laser Processing
Dec. 07, 2022


Laser processing refers to the use of laser beam for material cutting, welding, surface treatment, drilling, micromachining, etc. As an advanced manufacturing technology, it has been widely used in automotive, aviation, electronic and electrical appliances, metallurgy, machinery manufacturing and other industries.


There are many types of lasers, which based on their working substances, can be divided into gas lasers, solid-state lasers, semiconductor lasers,liquid lasers and so on. Carbon dioxide lasers in gas lasers are commonly used for cutting and marking leather, wood, acrylic, fabrics, etc. Semiconductor lasers have gradually replaced traditional CO2 or fiber lasers in the fields of plastic welding, wood cutting and marking due to their cost advantages and increasing power with a variety of wavelength types. Fiber laser is one of the solid-state lasers and is currently the most widely used laser. There is an important market for the fiber lasers in marking of plastic, wood, and metal materials, as well as rust removal, welding and cutting of metals. Diode pumped solid-state lasers have obvious advantages in processing of non-metallic materials, such as glass marking, internal engraving and cutting, precision marking of plastic or semiconductor materials, and processing and manufacturing of PCBs.


According to the pulse duration, lasers can be divided into millisecond, microsecond, nanosecond, picosecond, and femtosecond lasers. Generally speaking, the narrower the pulse width and the shorter the wavelength, the higher the precision of processing. Millisecond and microsecond lasers are commonly used in the welding of metal materials. Nanosecond lasers are currently the most widely used and mature lasers in various industries. Picosecond and femtosecond lasers are mainly used in the field of precision machining. The following diagram shows the thermal effect of lasers with different pulse widths when processing materials.



In certain processes of PCB manufacturing and diode chip production, the interaction between laser and materials requires a certain amount but not too much of heat. The thermal effect of traditional nanosecond lasers are too strong, while picosecond or femtosecond lasers have too little heat and cannot remove materials cleanly, such as repairing PCB circuit boards. At this point, the sub nanosecond microchip laser precisely solves this problem, with a pulse width between 300ps and 2ns, which is between nanosecond and picosecond lasers, taking into account the cooling of ultrafast lasers and the heating of nanosecond lasers. The sub nanosecond microchip laser produced by RealLight has been recognized by customers in the field of PCB repair and is being mass-produced and supplied. In addition, in some industries, due to the high cost of picosecond lasers and the poor performance of nanosecond lasers, sub nanosecond lasers are favored by customers due to their low price and good performance.


The sub nanosecond laser is mainly aimed at the field of precision processing of materials, and its typical optical path is shown in the following figure. There are still many aspects to be developed in its application field, and we welcome everyone to explore and try together.

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