How far can the laser pointer shine?
The laser pointer is widely used in daily work and life. It is used as an indicator when explaining PPT in class, or as a marker for accurately indicating buildings from a long distance, or as a cat-playing artifact for people who play cats. The high-power laser pointer can ignite combustibles and cause fires. In addition, the laser pointer should not be directly directed at people's eyes, otherwise it will cause irreparable damage. The laser range depends on the power and divergence of a single laser. So there is no power premise, just like asking a light bulb without a limited wattage, it can't describe how bright it is.
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The farther the object is irradiated, the larger the area of the light spot and the darker the color. This is because although the laser is highly collimated light, it will gradually diverge as the propagation distance increases and the air is scattered, and the brightness will gradually decrease. What we usually call the green high power laser pointer has a range of 3 kilometers. Generally, at night, the power of the pen is about 30MW, which can be seen. But human eyes generally can't see 3 kilometers, so what we often say is how far your eyes can see, the green pen can shine.
2021-10-18 08:10:08
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