Common laser pointers around us
Laser pointers and bar code machines used by cashiers may be the most common and cheapest lasers in our lives. The power consumption of the Laser pointer is also very small, and it seems that it is not lethal. It is difficult to associate it with the powerful laser in our impression. But the laser pointer is indeed a solid-state laser. Laser pointers are generally red, but also blue and green, but the laser does not emit "white light" and composite light; and the laser pointer can transmit a long distance and form a small spot on the wall, which shows its The directionality is very good; if you accidentally look directly at the laser pointer, your eyes still can't stand it. It can be seen that the concentrated energy is still very powerful in the small beam range under its jurisdiction. These are characteristics that cannot be achieved by ordinary light sources.
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The widely used laser is like a sharp double-edged sword. People use its features such as directional light, extremely high brightness, and great energy to benefit the society; on the other hand, if you don't pay attention to protection in the application, these features may cause damage to the eyes and skin. The type of laser can be classified according to its different working materials, as well as different excitation modes, different operation modes and different output wavelengths. The solid-state lasers that we have come into contact with are mostly solid-state lasers. Now, solid-state lasers have developed into all-solid-state lasers. It uses crystal or glass as the laser matrix, and then uses metal ions as the working medium to generate radiation. The more typical ones are Nd:YAG lasers (yttrium aluminum garnet lasers), ruby lasers and fiber lasers. The other type is gas laser. As the name suggests, the working medium of gas laser is gas. There are atoms, ions, molecules, and excimer lasers. There is also a liquid laser, which is also called a dye laser, which is mainly composed of organic solutions or inorganic solutions mixed with metal ions as a working medium. There are also semiconductor lasers, free electron lasers, and so on.
2021-10-08 09:01:48
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