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Anonymous users2024-02-06For example, ships use lights to communicate, and traffic lights use red, yellow, and green for scheduling. But all these ways of transmitting information with ordinary light can only be limited to short distances. If you want to transmit information directly to distant places through light, you can't use ordinary light, but only lasers.
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Anonymous users2024-02-051.Laser processing system.
2.Laser processing process.
Laser welding, laser cutting, laser **, laser marking, laser drilling, laser heat treatment, laser rapid prototyping, laser coating.
Lasers are used in medicine.
Lasers are used in industry.
Laser cosmetology. Laser cooling.
Laser spectroscopy.
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Anonymous users2024-02-04The particle absorbs energy from a low energy level to a high energy level, excitation of the laser.
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Anonymous users2024-02-03Laser can be very different from ordinary light, it has a high degree of directionality and monochromaticity, we can make the limited laser energy highly concentrated in time and space through optical means, so that the laser has extremely high brightness, so that it also maintains extremely high energy. For example, a low-power helium-neon gas laser can emit 100 times the brightness of sunlight; And the laser brightness emitted by Q-switched ruby lasers is hundreds of millions of times higher than that of sunlight! It is precisely because of this property of the laser that its energy is amazing.
As soon as the laser beam shot from the laser ** hits the object, even the tank can be burned through.
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Anonymous users2024-02-02The full English name of the laser has fully expressed the main process of manufacturing the laser. But before we can explain this process, we must first understand the structure of matter, and the principles of radiation and absorption of light. Matter is made up of atoms.
Figure 1 is a schematic diagram of a carbon atom. At the center of the atom is the nucleus, which is made up of protons and neutrons. Protons are positively charged, while neutrons are not.
On the periphery of the atom, negatively charged electrons are distributed and move around the nucleus. Interestingly, the energy of an electron in an atom is not arbitrary.
Quantum mechanics, which describes the microscopic world, tells us that these electrons are at fixed energy levels, with different energy levels corresponding to different electron energies. For the sake of simplicity, we can think of these energy levels as some orbits around the nucleus, as shown in Figure 1, and the farther away from the nucleus, the higher the energy of the orbit. In addition, the maximum number of electrons that can be accommodated in different orbitals varies, for example, the lowest orbital (which is also the orbital of the nearest nucleus) can hold only 2 electrons at most, the higher orbital can hold 8 electrons, and so on.
In fact, this oversimplified model is not entirely correct, but it is enough to help us illustrate the basic principles of lasers.
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Anonymous users2024-02-01If there are more particles in a system in a high-energy state than in a low-energy state, there is a reversal of the number of particles. Then as long as one photon is initiated, an atom in a high-energy state will be stimulated to emit a photon identical, and these two photons will trigger other atoms to be stimulated to radiate, so that the amplification of light is realized, that is, the laser.
The divergence angle of the laser is small, making it suitable for long-distance propagation.
When optically treated, the laser beam can be focused, so that it can generate a high amount of energy that can be used in industrial processing. The lasers commonly used in the industry are: carbon dioxide laser, which can produce more than 10kw of power, nd:
YAG lasers can produce a power of about 5kW, and semiconductor lasers, whose laser beams can be superimposed to obtain strong power in a small volume, are widely used in various fields. There is also a very important excimer laser, which can be used to cut and process almost all materials, but it is difficult to get strong power in the industry, compared with the first three, although there are many uses, but the application is not as wide as them. It is worth mentioning that the popular laser myopia correction and laser cosmetology all use excimer lasers.
According to the power from low to high, the application of laser has from the supermarket barcode scanner, the laser pointer used in teaching, the laser pointer used in the optical drive, the industrial processing, the most powerful number of lasers.
The energy of a laser mainly depends on its wavelength, the shorter the wavelength, the higher the energy.
Be careful when using or touching lasers. The harm caused by laser to the human body is mainly **, the eyes. Especially in the eyes, do not look directly at the laser, know that the lens in the eye can magnify the energy of the laser 100,000 times!
Because the lens can shrink the laser spot by three orders of magnitude, the corresponding energy can be expanded by six orders of magnitude! Instantaneous, powerful energy can burn your retina and even burn the "parts" more insideHence the serious warning! ：
Do not look directly at the laser.
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Anonymous users2024-01-311.Laser acacia processing system.
2.Laser processing process.
Laser welding, laser cutting, laser **, laser covering, laser masking, laser drilling, laser heat treatment, laser rapid prototyping, laser coating.
Lasers are used in medicine.
Lasers are used in industry.
Laser cosmetology. Laser cooling.
Laser spectroscopy.
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It is recommended that the third year of high school to the end, the exam or not is the same thing, I really don't want to learn to do something I am interested in, extracurricular books, etc., at least mix a high school Chinese certificate, now no culture is really not good to mix society, unless your dad is bullish, you want to wait for you to be 30 years old, 40 years old or even 50 years old, at least you finished high school.
Hehe, the reason why a military school is called a military academy is that you become a reserve officer of the country, you don't need to pay tuition fees for four years of college, and there is a living allowance, but in exchange, you want to serve in the country's army after graduation, so after graduation, the state will assign you to serve in the army somewhere Generally, as soon as you graduate, you are a platoon or deputy company officer, as long as you work hard, there is a lot of room for growth, of course, if you want to compare the treatment of officers with the boss of the enterprise, of course, it can't be compared, but you have to remember that you have a job as soon as you graduate from college And the salary is definitely not low The state is now raising the salary of soldiers every year So I personally think that the military school is still very good Otherwise, why are so many people crowded to go to the military school now?