The green laser pointer is the most popular laser pointer in the world. Because green light is 6 times brighter than red light, the light column is more obvious than red light, and the price is much cheaper than blue light and yellow light. Laser pen users generally use a green pen.
Green laser pointer features
Unlike traditional laser pointers. The green laser pointer emits light at a wavelength of 532 nm and the laser type is Class IIIA, using two 7-cell batteries. The brightness of the green laser pointer is relatively objective, so the risk to the eyes is relatively high, and the higher the power, the more dangerous. In general, 5mw is commonly used, the US market allows 5mw laser pointers, and more than 5mw need to pass special approval. There are no strict restrictions in China, which requires our users to pay special attention to safety, not to the eyes or other vulnerable parts, but also to prevent the laser from entering the eyes through reflection. In general, the adjustable focal length of green light will also have a double protection switch.
It belongs to a solid laser
The nonlinear crystal is excited by a wavelength of 808 nm infrared laser to generate 1064 nm infrared light, and then doudens to generate 532 nm green light, which belongs to a solid laser. Some green lasers operate in pulsed or quasi-continuous mode to reduce cooling and extend battery life.
The announced green laser that does not require multipliers is more efficient. Even low-power green light can be seen at night due to Rayleigh scattering of atmospheric molecules, which are often used by astronomy enthusiasts to point stars and constellations. The green laser pointer can have multiple output powers. 5mW is the safest to use and is also visible under darker lighting, so no more power is needed for pointing purposes.
Applications of Green laser
Green laser pointer are used in teaching
The green laser pointer is often used in teaching. It is a modern teaching mold and equipment. The teaching laser pen is the third generation of laser pen that can be written. Teachers, trainers and speakers are all involved in teaching demonstrations and project demonstrations. To such awkwardness, it is necessary to explain while operating the computer, and the action is restricted, which is very inconvenient. How to let the user completely liberate during the teaching demonstration, and truly realize "where to go, where to talk, where to talk, where to point." The emergence of the laser pen really solved these problems and completely freed the speaker.
They were used by astronomy enthusiasts
For astronomy enthusiasts, how much power and price point should be chosen to meet the requirements of the star? Personally think that the power of 20mW to 50mW is more appropriate, the power above 50mW can be particularly glaring in indoor dim conditions. The price of the laser pen is mainly related to its bandwidth and stability. The narrower the bandwidth, the more expensive the price, but the human eye can't distinguish the difference in bandwidth. Therefore, the friend with more economical choice chooses the power below 50mW, and the price is at A laser pointer below 100 yuan is more suitable. In addition, the power consumption of the laser pen is generally large, in line with the principle of environmental protection and saving, it is also necessary to have a pair of good rechargeable batteries. At present, the price of 50mW power is not very expensive, only a little more than 100.
Frequently asked questions about green lasers
In addition, many friends may encounter such a problem: how to use a good star pen during the day, how to "no electricity" at night? The laser generation principle adopted by the star pen is: pumping the laser crystal with a semiconductor 808 nm laser, and then obtaining the frequency. The various characteristics of the semiconductor pump laser are sensitive to temperature. When the temperature is low, the wavelength drifts, so that the pump light cannot be absorbed by the laser medium, so the green light cannot be generated, and the laser pointer cannot be normal. Work, at this time, just hold the laser pointer with your hand for a while, let the temperature rise to more than 20 degrees, the pen will work normally, if not, then it may be necessary to replace the battery.