The development road of the strongest artificial laser pointer

 We living in modern society are often exposed to lasers. For example, in schools, teachers use high power laser pointer in class; in medicine, lasers can be used to correct vision defects; in industry, we can use lasers to cut steel and other materials; in supermarkets, when salespeople check out The electronic scanning gun used also uses a laser.

What kind of light is laser?

First of all, ordinary light, that is, common light in our daily life, is mostly irrelevant light sources, such as the light of a flashlight, the light of the sun, and the light emitted from an electric bulb. The so-called incoherence means that the light emitted from these light sources has two common characteristics. They are all composed of different colors of light, and they all look white, and these different colors of light, even the same color of light, The direction of polarization is different.
The Green laser pointer is like a lot of people walking in a phalanx. Everyone has the same pace, speed and direction, with strong controllability and high mobility. Ordinary light is like the crowd on the square. Everyone has different steps, speeds and even directions, with low controllability and poor mobility.

What is a laser pointer?

A laser pointer is a beam of visible light with a very narrow coherence low-power laser emitted from a laser diode with a power supply and a small handheld device, intended to have a small colored light spot by illuminating what it is used to highlight something of interest. In most jurisdictions, the power limit must not exceed 5 mW.

Features of the strongest laser pointer:

1. The width of the beam is small and the power of a typical laser pointer is low, so that the beam itself is invisible in a fairly clean atmosphere, and the light spot is displayed only when it hits an opaque surface.
2. The high-power blue laser pointer projects visible light beams by scattering dust particles or water droplets along the beam path.
3. High-power and higher-frequency green or blue lasers may even produce visible light beams in clean air. This is due to the Rayleigh scattering of air molecules, especially when observed under moderate to dim lighting conditions.
4. When observing these beams at an angle near the axis of the laser pointer beam, the intensity of this scattering increases. Such indicators, especially in the green light output range, are used as astronomical target indicators for teaching purposes.

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