Oct 30, 2020
Nanoseconds, picoseconds, and femtoseconds are time units, 1 second= 103 milliseconds=106 microseconds=109 nanoseconds=1012 picoseconds=1015 femtoseconds, picosecond laser and nanosecond laser refer to the action time of a single laser pulse ( Pulse width) in the picosecond, nanosecond level. The laser processing method is to use a high-energy laser beam to irradiate the surface of the material after focusing to cause a physical or chemical reaction. It is essentially a thermal processing method, but due to the short action time, usually within a few nanoseconds. Therefore, the heat-affected area is small, and the processing effect and processing speed can be guaranteed. Picosecond lasers and femtosecond lasers with shorter pulse widths have achieved technological breakthroughs in the laser industry and are called micro-precision ultra-fast laser processing systems.
The picosecond laser has ultra-short pulse time, and the action time of a single pulse is only a few picoseconds, so its thermal effect is very small, or even negligible. Different from the processing of the nanosecond laser cutting machine, the picosecond laser does not recast the material during the entire processing process, the processing process is cleaner, and the absorption of laser energy is less dependent on the material or wavelength. At the same time, the action time is short, the accuracy is higher, and the processing speed is faster.
Compared with the nanosecond laser, the picosecond laser cutting machine has better processing effect and processing speed. In the market application field, the picosecond laser also has a wider space, such as solar cell laser etching (narrower line width), OLED laser Cutting (smaller chipping), laser drilling of brittle materials (faster speed), etc.
Of course, the current mainstream laser processing market is still dominated by nanosecond lasers. The reason is the high cost of picosecond ultrafast laser cutting machines. The future trend must be picoseconds and femtoseconds.