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laser
Posted on:
2018-08-08
Laser is another major invention of mankind since the 20th century after nuclear energy, computers and semiconductors. It is called "the fastest knife", "the most accurate ruler" and "the brightest light". Light emitted by excited atoms is called "laser".
Light is the energy absorbed by electrons in an atom, which transitions from a low energy level to a high energy level, and then falls back from the high energy level to the low energy level. When falling back, the released energy is released in the form of photons. The laser is the photon queue that is induced (excited). The photons in this photon queue have the same optical characteristics and the same step. For example, the photons emitted by ordinary light sources, such as light bulbs, are different and run in different directions. They are not united. However, the photons in the laser tend to think in one direction and move in one direction. This leads to their unstoppability and great power.
Laser is widely used, mainly including laser marking, laser welding, laser cutting, optical fiber communication, laser spectrum, laser ranging, laser radar, laser weapon, laser record, laser indicator, laser correction, laser cosmetology, laser scanning, laser mosquito killer, etc.
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