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Infrared ray is an electromagnetic wave with a wavelength between microwave and visible light. It has the same essence as radio wave and visible light. Its wavelength is between 770 nm and 1 mm, and it is located outside the red light in spectrum.
For the laser with a wavelength in visible and near-infrared light, the absorption rate of refractive media is low, the transmission rate is high, and the refractive media has a strong focusing ability.
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