What are the common uses of green lasers?
Astronomers use Green laser to point out celestial bodies to others. Due to its high power, this type of laser is more effective in astronomy than other colored lasers. The green laser can be used in astronomy by hand or by mounting it on the telescope. The power of a green laser pointer varies, but even a weak laser is more effective for astronomy than a red or blue laser. At present, red lasers are used for radiation therapy at home and abroad. The Laser Research Center of Henan Medical University found from the blood absorption spectrum analysis of various wavelength lasers that the absorption rate of blood to green lasers is four times greater than that of red lasers.
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The laser crystal is pumped by a semiconductor 808nm laser, and then obtained by frequency doubling. The various characteristics of the semiconductor pump laser are very sensitive to temperature. When the temperature is low, its wavelength shifts, so that the pump light cannot be absorbed by the laser medium, so green light cannot be generated, and the laser pointer cannot function normally. At this time, you only need to cover the laser pointer with your hand for a while, let its temperature rise to more than 20 degrees, and the pen can work normally. If it still doesn't, then maybe it's time to replace the battery.
2021-10-15 08:38:16
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