High-power portable laser pointer cannot be used as a toy
When you use a high-power portable laser pointer, you cannot look directly at the laser beam or point. In addition, please do not try to aim the long-distance visible green laser at moving vehicles, airplanes, human eyes or animals. Anyone using this type of equipment should wear laser glasses to protect the strong laser radiation. The 1000mW high-power green laser pointer is not a toy, but a powerful weapon in the hand. The laser pointer sold on the market is essentially a small laser generator composed of a laser diode, a control unit and a power supply. It mainly relies on excitation in the resonant cavity of the energized laser diode to generate a single-wavelength directional beam, that is, laser. For lasers, power is an important indicator to measure the energy released per unit time. Generally, the power of Laser pointer on the market ranges from a few tenths of a milliwatt to a few hundred milliwatts. The higher the power, the more energy the laser can output per unit time.
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Like ordinary light, laser light contains energy. Compared with ordinary light, laser light has the characteristics of directivity and energy concentration. Because of its good directionality and concentrated energy, it is used in many aspects of life, such as positioning, indication, and signal transmission. Therefore, the laser pointer is also called "pointer pen" and "pointing star pen". However, because of its energy concentration, objects irradiated at a relatively short distance will absorb the energy emitted by the laser at the irradiated point, thereby converting it into heat energy and increasing the temperature of the object. When the temperature is higher than the melting point or ignition point of the irradiated object, the object will be melted or ignited. The balloon explosions and firewood shown in the program were caused by the laser's irradiation that made the temperature higher than the highest temperature that the rubber and match head can withstand. Similarly, laser irradiation on human tissues will also cause a certain thermal effect. If the power is too high, the heating effect is significant, then it may cause harm to the human body.
2021-10-02 11:04:39
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