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APHORISMS OF FAMOUS PEOPLE
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Aphorisms of famous people. Louis Ferdinand Celine

Aphorisms of famous people

Free library / Aphorisms of famous people

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Louis Ferdinand Celine. The most famous aphorisms

  • By God, everything interesting happens somewhere under a bushel. No one knows anything about the true history of man.
  • They leave the prison alive, they do not return from the war. Everything else is words.
  • Don't take people's word for it when they tell you how unhappy they are. Just ask them if they can sleep. Yes, it means everything is in order. It's enough.
  • Giving up on love is even harder than giving up on life.

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See also Sections Winged words, phraseological units и Proverbs and sayings of the peoples of the world.

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Organic lasers for color displays and projectors 29.05.2017

Scientists from the Center for Organic Photonics and Electronics Research (OPERA), Kyushu University, Japan, have developed a new type of optically pumped thin-film organic laser. And this laser, thanks to a number of innovative solutions, is able to emit light continuously for 30 milliseconds, which is 100 times longer than similar devices of the previous generation could do.

Unlike solid-state lasers based on inorganic materials, commonly used in laser optical drives and laser pointers, organic lasers use a thin layer of organic molecules of a strictly defined type of substance to amplify light. One of the main advantages of organic lasers is that with their help it is enough to get light of any color and shade, for this it is enough just to use molecules of a certain substance with suitable optical properties.

Specialists have been working on the creation of organic lasers for quite a long time. But their efforts have not yet brought significant results due to the fact that organic substances degrade rather quickly, being in an environment through which significant energy flows pass. The degradation of molecules leads to a sharp increase in energy losses and makes further operation of the organic laser practically impossible.

Japanese scientists managed to find a solution to the problem and increase the time of continuous emission of coherent light by a laser using three different methods. The first part of the solution was the material from which the body of the organic laser was made, which effectively absorbs light with any wavelength different from the wavelength of the emitted light. This effect gives the laser high efficiency due to the formation of triplets of exions, quasiparticles, consisting of an electron and an electron hole bound to each other.

Thermal degradation of organic material was reduced by building the entire device on a transparent silicon substrate, and the upper part of the laser structure was glued with a special polymer to a sapphire glass base. Silicon and sapphire are fairly good heat conductors, which provide very good heat dissipation and effective cooling of the laser during operation.

And the third part of the solution was a layer of material placed under the layer of the organic body of the laser, which provided optical feedback that regulates the ratio of the amount of ultraviolet light absorbed to the amount of light emitted. Such feedback makes it possible to reduce the amount of pump energy absorbed by the laser, which reduces the number of losses and eliminates the possibility of overheating, leading to degradation of the organic material.

Using organic lasers in conjunction with lasers based on inorganic materials, it will be possible to easily obtain colors and shades of light that are impossible or very difficult to obtain using conventional lasers. And such hybrid laser devices can be widely used in sensors of various types, in spectroscopy, in optical communications and in information display technologies.

In their future work, Japanese scientists will look for additional methods and solutions that will allow them to increase the continuous operation time of their organic thin-film lasers. In addition, work will be carried out aimed at the direct use of electric current as the main energy source for pumping an organic laser.

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