Laser is widely used, including laser marking, laser welding, laser cutting, optical fiber communication, laser ranging, lidar, laser weapons, laser recordings, correction of laser vision, laser beauty, laser scanning, laser destruction. Mosquito Detectors, LIF Non-Destructive Testing Technology, etc. Laser systems can be divided into continuous wave lasers and pulsed lasers.
The laser is another major invention of humanity since the 20th century, after nuclear energy, computers and semiconductors. It is known as "the fastest knife", "the most precise ruler" and "the brightest light". The full English name of laser fully expresses the main manufacturing process of laser. The principle of the laser was discovered by the famous American physicist Einstein in 1916.
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First capture
2015 1 activated On March 27, "New Scientist" reported that using an ultra-fast camera capable of detecting single photons at 20 billion frames per second, scientists have captured for the first time the image of a laser flying through the air. In 10 minutes, the researchers recorded 2 million laser pulses produced when photons collide with air. This technology can be used to patrol corners of the environment, display objects that cannot be seen on the screen, and can also be used in places where precise measurement of temporal information is required.
"This is the first time we've seen what light looks like when it passes through," said Gary Pi, lead researcher at Heliwat University in Scotland. Under normal circumstances, scientists can only use reflections. objects. Come see the light. See the lightser is trickier because the photons move in a focused beam, all in the same direction.
Reference documents:
Baidu Encyclopedia-Laser