Information about the small laser pointer
A small laser pointer refers to a handheld, pen-like, and battery-powered device that can project laser beams. They are often used to highlight key locations or areas of interest in the distance on the screen during presentations. When a bright light beam hits people’s eyes, the laser pointer is especially dangerous to people because it can cause disorientation and possibly cause accidents. One example is the threat that laser pointers pose to pilots during the critical stages of take-off and landing.
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Common laser pointers emit red light, although there are also laser pointers that emit green or blue light. Laser pointers with laser class 1, 2 or 3a and beam power up to 5 milliwatts (mW) are within regulatory limits. The laser level provides users with an indication of the degree of laser hazard. The higher the level, the more powerful the laser, and the greater the possibility of danger if used improperly. The small laser pointer is a particularly small and cheap version of the Raman spectrometer. Their working principle is to irradiate a highly focused light beam onto a material sample at a specific wavelength. The material scatters light. Although most scattered light retains its original quality, some of it will experience a shortening or lengthening of its wavelength, which is caused by the unique properties of the material. By detecting this changed wavelength and then comparing it with the wavelength of the original emitted light, the spectrometer can identify which chemical substances are present in the sample.
2021-09-18 06:25:54
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