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Zinth, Wolfgang and Nuss, M. C. and Kaiser, Wolfgang (1983): Narrowing of spectral lines beyond the natural or dephasing line width. In: Optics Communications, No. 44: pp. 262-266
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Abstract

Transient excitation and gated or delayed observation provides a narrowing of the inherent line width of the transition. Possible experimental one- and two-photon systems are discussed and the loss of signal with line narrowing is calculated. The general case of lines broadened by dephasing processes is treated. Contact is made with the line narrowing in recent Raman type experiments.