The first laser in the world was a ruby laser.
It was made in 196 by Meiman, a scientist of Hughes Aircraft Company, USA. It is a solid-state laser. Its excitation system is a spiral flash tube that can suddenly burst into strong light, and the laser material is a ruby bar inserted in the middle of the spiral tube. Ruby emits laser light after being irradiated by the light emitted by the flash tube. After being strengthened and adjusted by the optical resonant cavity, it emits a powerful laser beam.
from then on, people can obtain a light source with similar properties to electromagnetic waves and stable frequency.
Application of laser:
Laser is one of the most important inventions of mankind in the 2th century. It is no exaggeration to say that there would be no information age without laser. Laser disc, optical fiber communication, bar code scanning, laser printing, laser pen, etc., are indispensable in the information age, and daily life cannot be separated from it.
Laser is widely used for ranging, and the average distance error between the earth and the moon can be less than one centimeter; Laser is also widely used in work production, such as cutting and drilling, welding, surface treatment of fasteners and so on.
In addition, it is also widely used in medical beauty, such as laser nevus removal, laser wrinkle removal and laser myopia treatment. In the military field, it is mainly used for manufacturing high-energy laser beam weapons, destroying enemy targets, intercepting enemy missiles and destroying enemy satellites.
At present, the most advanced and sci-fi fields of laser application are nuclear fusion, beam traction, laser sail and so on. Laser is used to ignite the nuclear fusion device, and a cage composed of several laser beams is used to restrain the high-temperature and high-heat nuclear fusion substances.
Anyone who has seen Star Wars should know that beam traction is not a science fiction. Now scientists can use it to move tiny objects, and it is mainly used in the medical field.