Why is green laser pointer usable in astronomy？
Astronomy enthusiasts just like to use a laser pointer to mark the position of the stars, so the green laser pointer has the nickname "pointing star pen". The laser energy of a green laser pointer is usually stronger, more conspicuous, and more dangerous. As for the laser suddenly cut off, there are usually two reasons, one is the power cut protection caused by heat, or it is simply burned out. The other is that the energy generation and release speed of the battery eventually cannot keep up with the energy emitted by the laser pointer, causing the battery to temporarily power off, and the laser is interrupted. For astronomy enthusiasts, using a star pen is because it is easier to use than a finger. If you point a star with your finger, it is not so easy to understand which star you are referring to. It is much better with a star pen, after all. The laser beam is very thin. When the laser is scattered by impurities in the air, it can leave a bright light path. If you look at the night sky along the direction of the laser light path, the error will be much smaller.
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What is the principle of the pointing pen used for astronomical observation? Why does the laser suddenly cut off? (Figure 1) It is worth mentioning that Laser pointer using different "working media" will emit light of different wavelengths, so they have five light colors of "red, orange, green, blue, and indigo". The use of green light as a star pen is not because the light itself has any special features, but because the human eye is most sensitive to the perception of green light, even the 5mW (IIIA) low-power green laser, at night with strong light pollution Can appear very clear Rayleigh. But in fact, there is no difference in the light beam emitted by a qualified laser pointer except for the brightness in a strong light environment-no matter how high the power of the laser pointer is, the light beam emitted towards the sky will be at the same height. "Suddenly "Cut off" is a visual phenomenon produced under the "Tyndall Effect".
2021-09-17 12:43:50
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