›› 2015, Vol. 34 ›› Issue (12): 52-52.
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Abstract: When giving presentations, many people use a laser pointer to direct the attention of the audience to information on a screen. The primary properties of laser light that make it useful in these technological applications are these : high intensity and a small angle of divergence. In this paper, using laser light radiate pressure, the pres- sure from laser pointer is derived and analyzed. The result shows that even for the radiated pressure from a 3.0-mW laser pointer is about the same as that of sunlight at the Earth' s surface. For this reason, it is not safe to shine the beam of a laser pointer into a person' s eyes, which may be more dangerous than looking directly at the Sun.
Key words: Poynting vector, electromagnetic radiation pressure, laser pointer
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https://dxwl.bnu.edu.cn/EN/Y2015/V34/I12/52
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