Аннотация:
The article gives an overview of the main theoretical and experimental studies of the phenomena caused by the formation of coherent states – coherent population trapping, electromagnetically induced transparency, and laser generation without inversion.
Ключевые слова:$\Lambda$-scheme, Liouville von Neumann equation, dark state, Hanle effect, Rabi frequency.
Поступила в редакцию: 10.10.2021 Исправленный вариант: 27.11.2021