Why does the green laser pointer shoot the farthest?

 The Green laser pointer is often used in teaching. It is a modern teaching mold and equipment. The teaching laser pointer is the third-generation writable laser pointer. Teachers, trainers, and lecturers all touch when they make teaching demonstrations and project demonstrations. To this kind of embarrassment, it is necessary to explain while operating the computer, and the movement is restricted, which is very inconvenient. For astronomy enthusiasts, how much power and price should be chosen to meet the requirements of pointing stars? Personally think that the power of 20mW to 50mW is more appropriate, and the power of 50mW or more can already feel particularly dazzling in the dark indoor conditions.

The price of a laser pointer is mainly related to its bandwidth and stability. The narrower the bandwidth, the more expensive it is, but the human eye cannot tell the difference in bandwidth at all. Therefore, friends who are financially struggling choose the power below 50mW, and the price is A laser pointer below 100 yuan is more suitable. In addition, the power consumption of the laser pointer is generally relatively large, in line with the principle of environmental protection and saving, it is also necessary to have a good pair of rechargeable batteries. The current price of 50mW power is not very expensive, only a little over 100.

What affects the exposure distance?

First, the wavelength is different

The wavelength of red light is 650~660nm; the wavelength of green light is 532nm. The shorter the wavelength, the greater the energy, and the beam of green light will be more pronounced than red light. This is why green light is chosen for general astronomy or outdoor guides. In addition, due to the strong power of the green light, it is necessary to pay more attention to the safety of the product during use. However, because green light is more scattered in the air than red light (the shorter the wavelength, the greater the scattering), and the sensitivity of the eyes to the green 532nm wavelength is about 8 times greater than that of the red 650nm, so the visual effect of green light is better than Hongguang is about 10 times larger.

Second, the light-emitting principle is different

The laser light emitted by the Laser pointer is a solid-state laser. The red laser mainly emits light directly after being energized by the laser diode; while the green laser cannot emit green light directly from the laser diode due to material problems. It needs to pass the infrared light wavelength frequency double conversion before it can emit green light. Light.

Third, the sensitivity is different
The human eye is much more sensitive to green light than red light; green light scatters more in the atmosphere than red light. In terms of quality, due to the complex structure of the green light, it is more prone to problems. Poorly installed crystals will affect the output. Therefore, the failure rate should also be higher than the red light.

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