First of all, the ultraviolet laser is a high-energy laser beam with a wavelength range of around 355nm and has the characteristics of high precision, high speed and high efficiency. In the field of 3D printing, UV lasers are mainly used to solidify liquid photosensitive resin to form a solid laminated structure. Among them, 3W and 5W ultraviolet lasers are two common power specifications, which refer to the laser output power of 3 watts and 5 watts respectively.