Lasing without inversion: The double Λ scheme
作者： Olga Kocharovskaya , Ruo-Ding Li , Paul Mandel
DOI: 10.1016/0030-4018(90)90437-X
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摘要: Abstract We determine the conditions under which a four-level medium in resonant cavity can start lasing when there is no population inversion between levels. The mechanism used creation of low-frequency coherence by pair external pump fields. it shown that with frequency upconversion requires at (low-frequency) nonlasing transitions.
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