Do you know how far can a 5mw red laser go?
The more powerful the laser, the farther the laser can go. This may not come as a surprise, but it is important to avoid it so that you can study the topic in more depth. Most laser pointers on the market are designed to have a 5 milliwatt beam. These laser pointers have certain legal restrictions in some places. In the United States, laser pointers should be kept below the 5mW limit before they can be sold. However, there are actually many laser spots that exceed this limit. In any case, it is important to acknowledge that under current standards, laser pointers should operate at 5mW or lower. Even a Laser pointer designed so weakly can reach a long distance. In fact, lasers can even be detected or seen by aircraft in the sky. There are some photos and evidence that the aircraft saw laser pointer points within a distance of at least 12 miles in the sky.
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The light emitted from the laser pointer is not completely collimated. Instead, it diverges away from the narrowest point (waist) and spreads to larger and larger points. In the end, it will diverge so much that it cannot be distinguished from the background. One way to define "background" is the solar spectral irradiance of the same wavelength (1.35 W/m^2) during the day and the spectral irradiance of the full moon (2.5 microW/m^2 according to this) at night. This brings us to the second question: "How far is the 5mw laser from the light source before the laser beam spreads to the limit?".
2021-09-18 06:18:50
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