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Semiconductors are believed to be a special class of chemical elements. Scientists got known about such substances in the end of the 19th century, but only in the 20th century scientists managed to get more knowledge about them. Russian physicists performed a lot of experiments. The results demonstrated that semiconductors may help to generate the fluctuations and maintain them. But such parts as semiconductor assembly which are used today were created significantly later. Just in the beginning of the 50's with the invention of transistors in 1949 the broad use of crystal detectors started. Since then many people all over the world become interested in such type of substance as semiconductors.

A lot of scientists carry out a great deal of researches simply to gain more knowledge about such feature of semiconductors as stimulated emission. It led to the appearing of semiconductor laser system based on usage of p - n barriers and then on heterojunction.

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