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    How to define the laser

    If you want to define a real Laser pointer, that is a good method. "The device generates a strong coherent monochromatic beam (or other electromagnetic radiation) by exciting photons from excited atoms or molecules." Since the explanation of the working principle of the laser becomes very complicated, we will not introduce it in detail in the buying guide.The basic principles of laser technology were first proposed by Albert Einstein in 1907, but it was not until 1960 that Theodore H. Maiman worked at the Hughes Research Laboratory in California, USA ( After Hughes Research Laboratories operated the first working laser, the first working laser appeared.

    Laser Pointer Blue Portable Efficient
    The laser is basically produced by the third transition mechanism. The principle of the ruby ​​laser is shown in Figure 3. It includes a flash, a laser medium and two mirrors. The laser medium is a ruby ​​crystal containing a small amount of chromium atoms. At the beginning, the flash lamp injects light into the laser medium, which stimulates the chromium atoms in it and excites the electrons in the outermost layer of the atoms. At this point, some electrons will return to a lower energy level by emitting photons. The emitted photons will be reflected by the mirrors arranged at both ends of the laser medium to excite more electrons for stimulated emission, thereby increasing the intensity of the laser engraver. One of the mirrors at the two ends will reflect all photons, while the other mirror will reflect most of the photons, and the rest of the photons passing through the latter mirror constitute the laser we see.
    It has been more than half a century, and laser technology has changed from a large machine found only in the laboratory to a widely used miniature laser diode. As mentioned earlier, laser has truly integrated into society due to its wide range of applications and has improved our lives in many ways.

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    You can find lasers for drilling and cutting, alignment and guidance, and surgery. Optical properties can be used for holography, reading bar codes, and recording and playing optical discs and DVDs.
    There is another feat in producing lasers: to achieve the so-called population inversion state. Take the ruby ​​laser as an example (Figure 4). The atom first absorbs energy and transforms into an excited state. The atom stays in the excited state only for an instant: after a few seconds, the atom drops to an intermediate state called a metastable state. It remains in a metastable state for quite a long time: about a few seconds or more. It stays in a metastable state for a long time, which will cause the number of atoms in this state to be greater than that in the ground state. This phenomenon is called population inversion. Population inversion is the key to laser generation because it ensures that the number of atoms that are stimulated to return from the metastable state to the ground state is greater than the number of atoms that transition from the ground state to the metastable state through spontaneous absorption, so the photons in the medium The number will increase, so there will be blue laser pointer output.
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    How to define the laser

    If you want to define a real Laser pointer, that is a good method. "The device generates a strong coherent monochromatic beam (or other electromagnetic radiation) by exciting photons from excited atoms or molecules." Since the explanation of the working princip...See more
    Dec 7 '20
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