What Is a GreenLight Laser?

The green laser pointer is the most popular laser pointer in the world now, because the green light is 6 times brighter than the red light, the beam of light is more obvious than the red light, and the price is much cheaper than the blue and yellow light. Laser pointer users generally choose green light pens.

Green laser pointer

The green laser pointer is the most popular laser pointer in the world now, because the green light is 6 times brighter than the red light, the light beam is more obvious than the red light, and the price is much cheaper than the blue and yellow light. Laser pointer users generally choose green light pens.

Chinese name

Green laser pointer

Foreign name

Green laser pointer

The wavelength of the light emitted by the green laser pointer is 532nm, and the laser type is Class IIIA. It uses two AA batteries. The brightness of the green laser pointer is more objective, so the danger to the eyes is also higher, the higher the power, the more dangerous. Generally speaking, 5mw is commonly used, and the US market allows 5mw laser pointers, and more than 5mw need to pass special approval. There are no strict restrictions in China. This requires our users to pay special attention to safety, not to face the eyes or other vulnerable areas, and to prevent laser light from entering the eyes through reflection. Generally, the green light can be adjusted with a double protection switch.

Infrared laser with a wavelength of 808nm is used to excite the non-linear crystal to generate 1064nm infrared light, and then generate 532nm green light through frequency doubling, which belongs to solid laser.

Some green lasers operate in pulsed or quasi-continuous mode to reduce cooling problems and extend battery life.

The announced green lasers that do not require frequency doubling are more efficient.

Even low-power green light at night due to atmospheric molecules

Green light laser pointer is often used in teaching. It is a modern teaching mold and equipment. Teaching laser pointer is the third-generation writable laser pointer. Teachers, trainers, and lecturers all touch on teaching demonstrations and project demonstrations. In such an awkward situation, it is necessary to explain while operating the computer, and the movement is restricted, which is very inconvenient. How to make users completely free during teaching demonstration, and truly realize "where to go, where to speak, where to speak, where to point". The advent of the laser pointer really solved these problems and freed the speaker completely.

For astronomy enthusiasts, how much power and how much price should you choose to meet the requirements of pointing stars? I personally think that the power of 20mW to 50mW is more suitable, and the power of more than 50mW can feel particularly dazzling in indoor dim conditions. The price of 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 this point. Therefore, the more economically disadvantaged friends choose power below 50mW and the price is between A laser pointer below 100 yuan is more suitable. In addition, the laser pointer generally consumes a lot of power. In accordance with the principles of environmental protection and saving, it is also necessary to have a good pair of rechargeable batteries. At present, the price of 50mW power is not very expensive, only a little more than 100.

In addition, many friends may encounter such a problem: how to use the stylus well during the day, how can it be "powerless" at night? The principle of laser generation used by the stylus pen is: a semiconductor 808nm laser is used to pump the laser crystal, and then obtained by frequency doubling. The various characteristics of semiconductor pump lasers are very sensitive to temperature. When the temperature is low, the wavelength drifts, so that the pump light cannot be absorbed by the laser medium, so it cannot produce green light, and the laser pointer cannot work normally. At work, just cover the laser pointer with your hand for a while, and let the temperature rise above 20 degrees, and the pen will work normally. If it can't, then it may be time to replace the battery.