An elegant way, a simple and effective way to solve this problem is to use the green pointer laser to eliminate objects in the sky. People are always confused about the colors of laser pointers used in astronomy. There is no doubt that it is a high-power green laser pointer. The green astronomical laser display is not the only ideal display; in astronomy, nothing is more frustrating than waving arms, fingertips, sketches and gestures to identify objects in the night sky Up. The Green laser pointer is an important technical tool. High-power green laser pointers complement each other and are widely known in astronomy. When we use the laser pointer, we will see a bright line on one side. This is because there are many particles in the air, many of which have a diameter smaller than the wavelength of the incident light. When the scattered light enters our eyes, we see the laser light from the side. This phenomenon is called the "ding-dong effect"
It is worth mentioning that laser pointers using different "working media" will emit light of different wavelengths, so there are five colors of "red, orange, green, blue, and indigo". The polychromatic light "appears" as soon as it passes through the prism. In this sense, what we see is not the laser itself, but the "scattered light" emitted when the laser hits air particles. Mainly used in complex environments with strong light interference (such as daytime or bright exhibition halls). No need to mention celebrities. Yes, after all, the night sky is not dazzling. In addition, the light emitted by a qualified high-power green laser pointer must be monochromatic light, and there will be no dispersion even when passing through a prism, while the colored light emitted by ordinary colored light is often a mixed light of red, green, and blue.
Therefore, the choice of astronomical laser pointer mainly depends on the light color, not the intensity. In fact, the volume of the high-power green laser pointer is relatively large, and the portability is relatively poor. The polychromatic light "appears" as soon as it passes through the prism. In this sense, what we see is not the laser itself, but the "scattered light" emitted when the laser hits air particles.