Laser is a new light source in 1960s. It has the characteristics of good monochromaticity, strong directivity and high brightness. Thousands of laser working substances have been found, ranging in wavelength from soft X-ray to far infrared.

There are many kinds of laser technology. Laser processing technology, laser rapid prototyping, laser cutting, laser drilling, laser welding, laser etching, laser engraving, laser surgery, laser weapons, laser energy.