Four characteristics of laser
Along a straight line rather than divergence
-High brightness
In the high concentration of space and time, it can get very high energy from the unit area and time.
-High security
The spectral width is very narrow and the color is very pure. It is divided into infrared light and ultraviolet which is called common light.
-High coherence
The same frequency, and the vibration direction of the same two wave has a phase constant encounter department. Laser can maintain a constant phase difference time.
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