YAG laser has been widely used in material processing, such as cutting, drilling, welding, etc, which not only improves the quality of the workpieces, but also the work efficiency. With Nd:YAG crystal's excellent thermal performance, the laser's reliability, efficiency, and power has been enhanced a lot. So it is widely used in laser rangefinder, laser radar, laser industrial processing, laser medical fields, etc. Besides that, it also provides a quick and precious method for scientific research