Coherent electromagnetic waves can be generated in the radio frequency range both by classical sources (moving charges) and by the maser* principle, but their generation in the optical range is only possible by the laser** principle. The laser represents an extension...
CITATION STYLE
Haken, H. (1984). Introduction. In Laser Theory (pp. 1–9). Springer Berlin Heidelberg. https://doi.org/10.1007/978-3-642-45556-8_1
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