Do you know the definition of laser?
A high power laser pointer is an optical amplifier-a device that enhances light waves. Some lasers have well-directed, very bright beams with very special colors; other lasers emphasize different characteristics, such as extremely short pulses. The key feature is that magnification makes the light very clear and reproducible, which is different from ordinary light sources such as the sun or lamps. In the past fifty years, our theoretical understanding of laser action has developed tremendously, as has the diversity and capabilities of modern laser systems. Lasers vary in size, from smaller than the diameter of a human hair to larger than a football field.
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The stored energy used for amplification can come from solids, liquids, gases, and even electron beams. Many modern lasers are tunable to a large extent; laboratory laser systems can generate infrared, visible or ultraviolet, and even X-rays on demand. In fact, for some lasers, they are affected in the direction that Einstein envisioned. Excited emission only plays a secondary role. Therefore, in practice, modern lasers are easier to identify than by definition: a laser is a bright light source with very clear characteristics that can be reproduced in time, space, or both. In contrast, the waves emitted by ordinary light sources fluctuate with time and position, although these fluctuations are usually not visible with the naked eye.
2021-10-19 12:19:06
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