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Green laser pointer is a very popular laser pointer at present, because green light is 6 times brighter than red light, the light beam is more obvious than red light, and the price is much cheaper than blue light and yellow light, laser pointer users generally choose green light pointer.
The wavelength of the green laser pointer is 532nm, the laser type is ClassIIIA, and it uses two AAA batteries. The height of the green laser pointer is relatively objective, so the danger to the eyes is also relatively high, and the higher the power, the more dangerous it is. Generally speaking, 5mW is. Commonly used, 5mW laser pointers are allowed in the US market, and special approval is required for more than 5mW. There are no strict restrictions in China, which requires our users to pay special attention to safety, not to face the eyes or other vulnerable parts, and to prevent the laser from entering the eyes through reflection. Generally speaking, the adjustable focal length of the green light will also have a double protection switch.
The non-linear crystal is excited by an infrared laser with a wavelength of 808nm to generate 1064nm infrared light, and then frequency doubling to generate a 532nm green light, which belongs to a solid-state laser. Some green lasers operate in pulsed or quasi-continuous mode to reduce cooling problems and prolong battery life. The announced green laser that does not require frequency doubling has higher efficiency. Even low-power green light can be seen at night due to Rayleigh scattering from atmospheric molecules, and this laser pointer is often used by astronomers to point out stars and constellations. Green laser pointers can have various output powers. 5mW is the safest to use and is also visible in dim lighting, so no more power is needed for pointing purposes.
The laser light in a laser pointer is the light emitted during the energy transition of the particles surrounding the atoms when they are excited by photons. It is characterized by brightness, directionality, chromaticity and high coherence. The beam can be precisely focused to the focal point and generate a high power density, so that a high temperature is generated near the focal point, that is, the thermal effect of the laser. Early laser pointers used a helium-neon (HeNe) gas laser with a wavelength of 633 nanometers (nm), typically used to generate laser beams with energies of no more than 1 mW. The cheapest laser pointers use deep red laser diodes with wavelengths close to 670/650nm. The slightly more expensive ones use red-orange diodes with a wavelength of 635nm, which is easier for the human eye to recognize. There are also other colors of laser pointers, the most common being green light with a wavelength of 532nm.
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 speakers can thoroughly perform teaching demonstrations and project demonstrations. Liberate and truly realize "wherever you go, where you speak, where you speak, where you point". For astronomy enthusiasts, you can choose a star pointer with a power of 20mW to 50mW to meet the requirements of star pointing. The price of a laser pointer is mainly related to its bandwidth and stability. The narrower the bandwidth, the more expensive the price, but the human eye can't tell the difference in bandwidth at all. In addition, the power consumption of the laser pointer is generally relatively large. In the principle of environmental protection and saving, it is also necessary to match a good pair of rechargeable batteries.
