Buy laser pointer pen select method?
A beam that can hit just a few kilometers from the focal point of the anti-diffuser can not only burn your eyes and cause vision loss, but also pose a threat to aviation. Finally, what is light? Driving on the road, a strong green laser beam was suddenly, instantly the short film vertigo. Recently, fuzhou citizens called our hotline to consult the high-power "cheap laser pen" "Reflective fuzhou streets, many car owners in the process of driving suddenly appear such a green laser, eyes is a disaster. Ophthalmologists said yesterday that most laser Pointers or toys on the market do not indicate any of the necessary levels of classification." Continuous laser exposure can cause damage to the retina.
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Colors For demonstration purposes, you can ignore the colors used. However, in poor lighting conditions, a green laser is preferable because it is considered better for the visibility of the human eye. With the same energy output, the green laser looks several times brighter than the green laser pointer. By the way, 2000MW laser Pointers usually do not have a permanent switch. They light up when you press the switch with your finger. In this way, you want to save battery life while keeping the power output low. Continuous lighting can also shorten service life. Cheap laser Pointers with designated power of up to 0.5MW can be easily purchased at corner houses or electronics stores. As class 3R laser equipment, these are commonly sold and used as so-called low power indicators and are advised to "avoid contact with the beam". The popular 500mW laser pointer DPSS (Diode pumped solid state) devices are usually made of neodymium-doped yttrium aluminum vanadate (Nd: YVO4) laser with a wavelength of 1064 nm, pumped by an 808 nm diode laser and doubled by a KTP crystal to halve the wavelength to output the desired 532 nm green light.
2021-12-10 10:52:23
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