Why Can't Lasers Be Seen In Daylight?

Laser is known as "the fastest knife", "the most accurate ruler", and "the brightest light". "Light amplification by stimulated emission of radiation", referred to as laser. How many colors does the laser have? The color of laser light is determined by the wavelength of the laser light. A certain wavelength corresponds to a certain color. When it passes through a prism, you can see seven colors of light: red, orange, yellow, green, blue, blue, and purple. In fact, it also contains infrared light and ultraviolet light that we cannot see. The monochromaticity of the laser far exceeds that of any kind of monochromatic light source. The color of the laser is very pure light, and it only emits light in one direction, with extremely high brightness.

We often encounter customers asking that they can’t see it when using the laser outdoors. The reason is that the power is too low. Can they see it when using a high-power laser? The more powerful the laser, the clearer the light. When the laser beam is seen, it occurs when the laser beam is irradiated by an object and is reflected or scattered or diffusely reflected in most cases. The same goes for sunlight in space. When the laser passes through the smoke or fog, it is obvious that the laser is blocked by the smoke particles and diffusely reflected, then we can see the laser beam, otherwise we cannot see it.

Why can't lasers be seen in the air, but can be seen when sprayed with water mist or smoke?

This is because the air is clean and the light travels in a straight line, and the light cannot be seen if it is not facing the direction of the light propagation. Water droplets have the function of reflection and refraction. When water mist or smoke is sprayed, due to the reflection of water droplets or smoke particles, and the concentration of light around, the laser light is diffusely reflected, and light enters the human eye, so we can see the laser light. In fact, the laser can also be seen in the air. The distribution of small water droplets in the air is scattered, so the reflection is difficult to find.

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