Firstly, the picosecond laser technology is introduced by comparing the long pulse laser with the short pulse laser. Secondly, the development history of the picosecond laser technology is de-scribed. Thirdly, the development status of the domestic and foreign picosecond laser technology is introduced. Then, the physical process of picosecond laser pulse formation based on SESAM passive mode locking technology is described, including nonlinear amplification stage, nonlinear absorption stage and line. In addition, the advantages and applications of picosecond laser processing technology are introduced. The application of picosecond laser processing technology includes metal drilling, marking, cutting, surface structure, surface cleaning and so on. Finally, by comparing the advantages and disadvantages of nanosecond, picosecond and femtosecond laser technology, the future prospect of picosecond laser technology is expressed.
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