Was the laser one of the 4 great inventions of the 20th century?

Yes, laser is another major invention of mankind since the 20th century, after atomic energy, computers, and semiconductors, known as the "fastest knife", and its principle was discovered by the famous American physicist Albert Einstein as early as 1916. The four great inventions of the 20th century were "lasers, atomic energy, semiconductors, and computers".

The world's first laser was the ruby laser

The world's first laser was created in 1960. American scientist Mayman invented the ruby laser on July 8, 1960, and since then people have been able to obtain properties and electromagnetic waves.

Similar and frequency-stable light sources, the era of modern optical communication has also begun.

Mayman in California in July 1960.

The Hughes Air Force Laboratory conducted the first test of artificial lasers, the first of which lasted 300 million thousandths of a second, marking the dawn of a new moment in the history of human civilization.

The significance of the invention of the world's first laser

After the success of the first laser, Meyman continued to research the application of lasers in medicine, although the public at the time thought it was a "lethal" line of Gwangju world. However, since Hughes did not invest more in the potential applications of lasers, Mayman chose to leave and started his own Korad company in 1961.

Mehman's invention has made a significant contribution to mankind, and lasers have become indispensable basic instruments and equipment in medicine, industry and many scientific research fields.

Ruby lasers. On July 8, 1960, American scientist Mayman invented the ruby laser, which was the world's first Yanchitai laser. From this field, people can obtain a light source with a stable frequency similar to electromagnetic waves.

The world's first laser wasRubyLaser.

It was made in 1960 by Mayman, a scientist at the American Hughes Aircraft Company, and it is a solid-state laser. Its excitation system is a spiral-shaped flash tube that bursts out of bright light, and the laser substance is a ruby rod inserted in the middle of the spiral tube. When the ruby is irradiated by the light emitted by the flash tube, it emits a laser light, and after being strengthened and adjusted by the optical resonator, a powerful laser beam is emitted.

From this one can acquire properties and electromagnetic waves.

Similar and frequency-stable light sources.

Applications of 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; Laser vertical chains 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 treatment, such as laser mole removal, laser wrinkle removal, laser ** myopia.

Wait; In the military field, it is mainly used to make high-energy laser beams.

**, which is used to destroy enemy targets, can intercept enemy missiles, destroy enemy satellites.

At present, the most cutting-edge and sci-fi field of laser application is nuclear fusion.

Beam traction, laser sails, etc. Lasers are used to ignite fusion devices and to use a cage of several laser beams to laser confine the high-temperature and high-heat nuclear fusion fiber.

Seen Star Wars.

Yes, this is not science fiction, and now scientists can use it to move tiny objects, which are currently mainly used in the medical field.

"The Red Treasure Bird Stove Worm Stone Laser" is the world's first buried laser. On July 8, 1960, the American scientist Mayman invented the ruby laser, and since then people have been able to obtain a light source with a stable frequency similar to electromagnetic waves. ”

1. Laser is60s of the 20th centurynew light sources. Laser is widely used because of its good directionality, high brightness, and good monochromaticity. Laser processing is one of the most promising areas of laser application, and more than 20 laser processing technologies have been developed.

2. Development: The laser has the characteristics of good monochromaticity, strong directionality and high brightness. Thousands of laser working substances have been discovered, with wavelengths ranging from soft X-rays to far infrared.

The core of laser technology is lasers, and there are many types of lasers, which can be classified according to different methods such as working substance, excitation mode, operation mode, and working wavelength.

According to different use requirements, some special technologies are adopted to improve the beam quality of the output laser and individual technical indicators, and the more widely used unit technologies include resonance cavity design and mode selection, frequency doubling, tuning, Q switching, mode locking, frequency stabilization and amplification technology.

3. Principle: Scientists use the energy of light or current in the electric tube to hit some crystals or atoms that are easily excited, so that the electrons of the atoms reach the excited high-energy state, and when these electrons want to return to a calm low-energy state, the atoms will shoot photons to release excess energy; Then, these emitted photons will hit other atoms, excite more atoms to produce photons, triggering a series of chain reactions, and all of them will move in the same direction, forming a strong and concentrated light in a certain direction; Therefore, the strong laser can even be used to cut steel plates!

4. Characteristics: Laser is widely used because of its characteristics. (monochromatic wavelength, cohomology, parallel beams).

A laser is almost a monochromatic light wave with an extremely narrow frequency range and high energy concentration in a narrow direction, so a focused laser beam can be used to punch holes in a variety of materials. In the case of a ruby laser, for example, the total energy of the output pulses is not enough to cook an egg, but it can make a small hole in a 3 mm steel plate.

The laser has the above characteristics, not because it has different light energy from other lights, but because it has a very high power density, which is why lasers are widely used.

Laser is another major invention of mankind since the 20th century, following atomic energy, computers and semiconductors. Its principle was discovered by the famous physicist Albert Einstein as early as 1916, but it was not until 1958 that lasers were first successfully manufactured. Laser came into being in the context of theoretical preparation and production practice urgency, and as soon as it came out, it achieved an unusually rapid development, and the development of laser not only gave new life to the ancient optical science and optical technology, but also led to the emergence of a whole new industry.

Lasers can enable people to effectively use unprecedented advanced methods and means to obtain unprecedented benefits and results, thereby promoting the development of productivity.