16 December 1992 Amplification without population inversion
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Proceedings Volume 1840, Transverse Patterns in Nonlinear Optics; (1992) https://doi.org/10.1117/12.131820
Event: XIV International Conference on Coherent and Nonlinear Optics, 1991, St. Petersburg, Russian Federation
Three- and four-level schemes of inversionless amplification with different types of coherent pumping is reviewed. Amplification without inversion between the 'bare' states is a result of population inversion between eigenstates of the density matrix. In particular, it can be achieved due to the coherent population trapping, i.e., effective removal from the interaction with the field a fraction of atoms at lower levels.
© (1992) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Olga A. Kocharovskaya, Olga A. Kocharovskaya, Paul Mandel, Paul Mandel, Yakov I. Khanin, Yakov I. Khanin, } "Amplification without population inversion", Proc. SPIE 1840, Transverse Patterns in Nonlinear Optics, (16 December 1992); doi: 10.1117/12.131820; https://doi.org/10.1117/12.131820

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