What's the use of laser?

Laser is widely used, including laser marking, laser welding, laser cutting, optical fiber communication, laser ranging, laser radar, laser weapon, laser recording, laser correction, laser beauty, laser scanning, laser mosquito killer, LIF nondestructive testing technology and so on. Laser system can be divided into continuous wave laser and pulsed laser.

Laser is another great invention after nuclear energy, computer and semiconductor since the 20th century. It is called "the fastest knife", "the most accurate ruler" and "the brightest light". The English full name of laser has fully expressed the main process of making laser. The principle of laser was discovered by Einstein, a famous American physicist, as early as 19 16.

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First capture

2065438+200565438+1On October 27th, New Scientist reported that scientists captured the image of laser flying in the air for the first time with an ultra-high-speed camera that can detect a single photon at 20 billion frames per second. Within 10 minute, the researchers recorded 2 million laser pulses generated when photons collided with air. This technology can be used to patrol the corners of the environment, display invisible objects on the screen, and can also be used in places where accurate time information needs to be measured.

"This is the first time we have seen light passing by," said Gariepy, the lead researcher at Heriothwater University. Under normal circumstances, scientists can only see light through the reflection of objects. It is more difficult to see the laser emitted by the laser, because the photons move in the focused beam and in the same direction.

References:

Baidu encyclopedia-laser