Some Types of Quantum Generators and Amplifiers
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Since the appearance of the first quantum generator, an innumerable quantity of a great variety of devices have been created. The manufacture of some of them has been assimilated by industry; others are at the development stage or in practical use in scientific laboratories. At present, their most significant application is in demonstration of quantum electronics possibilities, and this is adding to the huge list of such devices, which now number in the thousands. For orientation in this “ocean” of devices, it is necessary to offer some classification. We can take the following parameters as a basis: the operating range, the aggregate state of the operating body, and the method used to obtain inversion.