Lasers are widely used in life, how did lasers come about?

The theory of lasers was first proposed by Albert Einstein in 1917. A laser is light that is stimulated by atoms. When an atom jumps from a higher energy level to a lower energy level, it releases energy, which is radiated in the form of light.

Ordinary light sources are derived from the spontaneous emission of atoms. Compared with ordinary light sources, laser has good monochromaticity, high brightness and good directionality.

Although the theory of the existence of lasers has been proposed, it is difficult to implement. The main reason is that there are two processes at the same time, stimulated radiation and stimulated absorption, which increase the number of photons and decrease the number of photons due to stimulated absorption. In order to produce a laser light, the stimulated radiation must be stronger than the stimulated absorption.

That is, the number of particles at the higher energy level is greater than the number of particles at the lower energy level, which is called particle number reversal. How to technically achieve particle number inversion is a necessary condition for the generation of lasers.

More than 40 years after Einstein proposed the laser theory, the American physicist Charles Townes finally solved the problem of laser technology application, put forward the idea of using microwaves to excite ammonia molecules to produce lasers, and in 1958, he and the American scientist Shaw Luo jointly discovered the principle of how to produce lasers.

They found that when matter is excited by energy at the same frequency as the intrinsic oscillation of its molecules, it produces this non-divergent bright light, the laser.

In 1960, the American scientist Theodore Mailer succeeded in creating the world's first laser, the ruby laser. In the same year, Soviet scientist Nikolai Basov invented the semiconductor laser. The lasers that are common in life today are produced by semiconductor lasers.

Lasers are one of the most important inventions of mankind in the 20th century, and it is no exaggeration to say that without lasers there would be no information age. Laser records, fiber optic communication, barcode scanning, laser printing, laser pointers, etc., it is indispensable in the information age, and it is inseparable from daily life.

Lasers are widely used for ranging measurement, and the average distance between the Earth and the Moon can be less than one centimeter; Lasers are also widely used in work production, such as cutting and punching, welding, firmware surface treatment, etc.; In addition, it is also widely used in medical cosmetology, such as laser mole removal, laser wrinkle removal, laser myopia, etc.; In the military sphere, it is mainly used to create high-energy laser beams**, which are used to destroy enemy targets, can intercept enemy missiles, destroy enemy satellites.

At present, the most cutting-edge and sci-fi fields of laser application are nuclear fusion, beam traction, laser sails, etc. Lasers are used to ignite fusion devices and to laser confine high-temperature and high-heat fusion materials using a cage composed of several laser beams. Anyone who has watched Star Wars should know that beam traction, yes, this is not science fiction, and now scientists can use it to move tiny objects, which is currently mainly used in the medical field.

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The theory of laser was first proposed by Albert Einstein. Lasers, on the other hand, are light emitted by stimulated radiation from atoms. This light is more penetrating and thermally sensitive than ordinary light.

Lasers are a type of light that is stronger and more penetrating than ordinary light, refracted by atoms, and was first proposed by Albert Einstein, the greatest physicist of the 20th century.

Laser is widely used in life, the laser is mainly produced from the semiconductor, which is an important widely used ranging invented by human beings, which has caused good fortune to human beings.

Lasers are actually the interaction between light and matter, and are the light emitted by atoms stimulus, which is one of the major inventions of mankind. It is widely used in our lives.

Laser is another major invention of mankind since the 20th century, following nuclear energy, computers and semiconductors, and is known as "the fastest knife", "the most accurate ruler" and "the brightest light".

Lasers are used in a wide range of fields, such as laser guidance in the military, lasers.

There are also laser communication, laser velocimetry, laser glass in industry, laser sensors, laser processing technology, and laser can also be used in medicine to do Jingslip surgery, laser ** myopia.

Advertising has also been played for many years, and laser beauty can also be used, as well as laser phototypesetting technology, which has rewritten the history of China's printing and printing industry.

Laser processing system: including laser, light guide system, processing machine tool, control system and detection system;

Laser processing technology: including cutting, welding, surface treatment, punching, marking, scribing, fine-tuning and other processing technologies;

Laser welding: automotive body thick and thin plates, auto parts, lithium batteries, pacemakers, sealed relays and other sealing devices, as well as various devices that are not allowed to be welded with pollution and deformation. At present, the blind macro lasers used include YAG exciter, CO2 laser and diode-pumped laser;

Laser cutting chain: automotive industry, computer, electrical casing, wood knife mold industry, cutting of various metal parts and special materials, circular saw blades, acrylic, spring gaskets;

Laser marking: It is widely used in a variety of materials and almost all industries;

Laser perforation: Laser perforation is mainly used in aerospace, automobile manufacturing, electronic instruments, chemical industry and other industries.

The background and principle of laser generation is a physical model. Lasers have very pure colors, almost no divergence in directionality, and extremely high luminous intensity, because of these magical properties, so that lasers have a range of applications in various fields. Laser is a kind of light that does not exist in nature and is emitted due to stimulation with good directionality, high brightness, good monochromacy and good coherence.

Laser applications are very wide, including laser marking, laser welding, laser cutting, optical fiber communication, laser ranging, laser radar, laser**, laser record, laser correction, laser beauty, laser scanning, laser mosquito killer, LIF non-destructive testing technology and so on. Laser systems can be divided into continuous-wave lasers and pulsed lasers.

Physicists traced the mechanism of laser generation back to the hypothesis proposed by Albert Einstein in 1917 when he explained the law of blackbody radiation, that is, the absorption and emission of light can pass through three basic processes: stimulated absorption, stimulated radiation, and spontaneous radiation. As we all know, the luminescence of any kind of light source is related to the state of motion of the particles inside its substance. When a particle (atom, molecule or ion) at a lower energy level absorbs the appropriate frequency of foreign energy (light) and is excited to jump to the corresponding higher energy level (stimulated absorption), it always tries to jump to the lower energy level and at the same time release the excess energy in the form of photons.

If the light is released spontaneously without the action of external photons (spontaneous radiation), the light released at this time is ordinary light (such as electric lights, neon lights, etc.), which is characterized by the fact that the frequency, direction and pace of the light are very inconsistent. However, if the excess energy is released in the form of photons (stimulated radiation) when the transition from a high energy level to a low energy level under the direct action of foreign photons, the released photons are completely consistent with the foreign incident photons in terms of frequency, phase, propagation direction, etc., which means that the foreign light has been strengthened, which we call light amplification. Obviously, if the number of particles at a higher energy level is greater than that at a lower energy level (particle number reversal) through stimulated absorption, the more obvious the amplification of this light will be, and then it is possible to form a laser.

This refers to the light produced by atomic stimulated radiation, because the electrons are absorbed, and the energy is from low to high, so it is generated, and the role of laser is very many, which can be used as a security measure, including laser marking, laser welding, laser recording, laser correction, and laser beauty.

A laser is a beam of light that is formed by a machine. Lasers are produced by instrument convergence. The role of the laser can be used for surgery, for some diseases, for mechanical manufacturing, and for medical treatment.

The combination of laser technology with other technical application areas has the following aspects:

1.Laser chemistry: Conventional chemical processes typically involve mixing reactants together, which often require heat (or pressurization).

The disadvantage of heating is that the irregular movement of molecules due to the increase in energy breaks the original chemical bonds and combines them into new ones, and these irregular movements break or produce bonds that hinder the expected chemical reaction.

But if a laser is used to direct the chemical reaction, not only can the aforementioned irregular movements be overcome, but also greater benefits can be obtained. This is because the laser carries a highly concentrated and uniform energy, which can accurately hit the bonds of molecules, such as using ultraviolet lasers of different wavelengths to hit molecules such as hydrogen sulfide, and changing the phase difference of the two laser beams controls the breaking process of the molecule. It is also possible to change the waveform of the laser pulse to hit the molecule with great precision and efficiency, triggering a desired response.

Laser chemistry has a wide range of applications. The pharmaceutical industry was the first to benefit. The application of laser chemistry technology can not only accelerate the synthesis of drugs, but also eliminate unwanted by-products, making some drugs safer and more reliable, and can also be reduced.

Another example is the use of lasers to control semiconductors, which can improve new optical switches, which can improve computers and communication systems. Laser chemistry is still in its infancy, but its future is bright.

2.Laser Medical: The application of lasers in medicine is divided into two main categories:

Laser diagnosis and laser**, the former uses laser as the information carrier, and the latter uses the laser as the energy carrier. Over the years, laser technology has become an effective means of clinical practice and a key technology for the development of medical diagnosis. It solves many difficult problems in medicine and contributes to the development of medicine.

At present, it has maintained a sustained and strong momentum of development in many aspects such as basic research, new technology development, and new equipment development and production.

At present, the excellent application research of laser medicine is mainly manifested in the following aspects: photodynamic ** cancer treatment; Laser** cardiovascular disease; excimer laser keratoplasty; Laser** benign prostatic hyperplasia; Laser cosmetology; Laser fiberoptic endoscopic surgery; laser laparoscopic surgery; laser thoracoscopic surgery; laser arthroscopic surgery; laser lithotripsy; laser surgery; the use of laser in anastomosis; laser applications in oral cavity, maxillofacial surgery and dentistry; Weak laser**, etc. Explained.

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It has a wide range of applications. Laser cosmetology, laser medical treatment, etc. Wider industrial applications:

Shoes, handbags, hats, greeting cards, acrylic inner, MDF wood board, PVC, PC board, etc. Hardware, electronic appliances, plastics, mobile phone buttons, glasses, knives, electrician switch panels, lighting accessories, buttons, *** mp4 hardware shell, etc.