Reflective mirror also known as full reflective mirror, usually adopts Molybdenum, silicon or cooper as base. The molybdenum base mirror has no reflective coating, it can work for a long time in r ed environment with high laser power, but lower reflectivity. The most popular mirror is made of silicon with coating, it has great thermal properties and high reflectivity. The reflectivity of SPT silicon laser mirror is up to 99.8%, which is amogest the highest in the laser industry.