Lasers have many properties: First, lasers are monochromatic, or single-frequency. Second, laser light is coherent light. The characteristic of coherent light is that all its light waves are synchronized, and the whole beam of light is like a "wave train". Again, the laser is highly concentrated, which means that it has to travel a long distance before it becomes dispersed or converged.

Do not be directly targeted by any laser beam under any circumstances!Care should also be taken to prevent the laser beam from reflecting into the eye.Therefore, it is necessary to wear laser protective goggles when laser work, in order to reduce the instantaneous accidental or chronic laser damage to glasses.