As a kind of laser marker, the working principle of deep ultraviolet laser marker is the same with other laser marker mostly, but compared with other laser marker, deep ultraviolet laser marker has high photoelectric conversion efficiency, the life time of nonlinear crystal is long, modular design, easy installation and maintenance, the performance of machine is stability, small bulk, low power consumption, high marking speed, high efficiency etc.. In addition, the quality of deep ultraviolet laser beam is good, the focal spot is smaller, which makes it achieve ultra-fine marking. When marking with the deep ultraviolet laser marker, the thermal influence area is very small, and will not produce thermal effect, so material burning problem will never be considered. Deep ultraviolet laser marker is especially suitable for ultra-fine process, such as glass, mobile phone screen, precision instruments, etc., for most metal and non-metal materials, such as hardware, ceramics, nameplate, display boards, plastics, etc., it is competent too.