Knowledge of laser pointer frequency band
The apparent brightness of the projector illuminated by the red, green, blue-violet and laser pointer depends not only on the laser output and surface reflectance, but also on the color of the human eye. For example, the human eye is most sensitive to green light with a wavelength between 520 and 570 nm in the visible spectrum, which makes red or blue less sensitive, while green light of the same wattage is brighter than other colors.
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The recommended output of the blue laser pointer is usually in milliwatts. In the United States, lasers are classified by the American National Standards Institute and the U.S. Food and Drug Administration (FDA). Visible light power is less than 1 mW (wavelength 400-700 nm) second class (class 2 or class II) laser pointer crow. The power of Class 3A (Class3A or IIIa) is 1-5mW. Laser Laser Class 3B (Class 3B / IIIb) (output 5 to 500 mW) and Class 4 (Class 4 / IV) (output 500 mW and above).
2021-10-14 12:52:42
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