Laser - physics, a material in the external energy excitation, from the low-energy state to the high-energy state jump released by a light wave (electromagnetic wave). The world's first semiconductor laser was developed by the Japanese company Panasonic, known in Japan as the "God light".
In the early 1990s, lasers were first used in medical treatment, as an important tool to assist in treatment and health care, the world's medical community was shocked and called it "the light of life". China has the first is the Japanese government in the early 90's gifted to the President of the North Medical Third Hospital, and China's first own semiconductor laser by the "Beijing Senton Medical Equipment Company Limited" boss Dr. Wu Xiaoguang (Tsinghua University) R & D success.