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Conference on Lasers and Electro-Optics

Electromagnetically induced transparency in a two-level system via atomic vibration

Yevgeny V. Radeonychev, Mikhail D. Tokman, Alexander G. Litvak, Olga A. Kocharovskaya

Published Jan 1, 2006• 0 citations
Publisher

Abstract

Atomic vibration enables to control resonant optical absorption by nonresonant drive including full transparency and amplification of resonant radiation. Mechanism is destructive interference of laser fields at resonance frequency in reference frame of vibrating atoms.
DOI
10.1109/cleo.2006.4628470

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Generation of coherent multifrequency optical radiation by means of excitation of mechanical vibration (acoustical oscillation) of a medium along the propagation of resonant laser radiation is proposed. At the same time the vibrating medium becomes transparent for the incident resonant radiation (acoustically induced transparency). We show, that generation of multifrequency radiation takes place in the absence of inversion in two-level quantum system for any energy distribution among the spectral components of the incident (multifrequency in general) field and any amplitude of vibration. Amplitude of vibration determines efficiency of the normal wave generation. Mechanism of the effect is destructive interference of different spectral harmonics of the field components appearing in the frame of vibrating atoms.
It is shown that mechanical vibration (acoustical oscillation) of a solid medium along the propagation of multifrequency laser radiation enables one to control the resonant absorption. There exists an optimal spectral structure of the incident field dependent on vibration amplitude as well as the number and intensity of the frequency components that provides the full resonant transparency. A mechanism of the transparency is discussed. Transparency of this kind is shown to appear also via adiabatic modulation of the atomic transition frequency by an external microwave field.
The equivalence between the off-diagonal radiative-decay coupling (ODRDC) effect in the bare-atom picture of a three-level atomic system [see Cardimona et al., J. Phys. B 15, 55 (1982)] and the electromagnetically induced transparency (EIT) effect in the dressed-atom picture [see Imamo\ifmmode \check{g}\else \v{g}\fi{}lu et al., Opt. Lett. 14, 1344 (1989)] is uncovered and a full comparison of their physical origins is given. The mechanism for both ODRDC and Harris' EIT is found to be a consequence of the quantum interference between a direct absorption path and an indirect absorption path mediated by either a self absorption of spontaneous photons or a Fano-type coupling. A connection is then pointed out between the effects of probe-field gain (PFG) based on an ODRDC process [see Huang et al., Phys. Rev. A 64, 013822 (2001)] and amplification without inversion (AWI) [see Fearn et al., Opt. Commun. 87, 323 (1992)] in the bare-atom picture of a three-level atomic system. The PFG effect is found as a result of transferring electrons between the two upper levels due to the phase-sensitive coherence provided by a laser-induced ODRDC process, while the AWI effect to one of the two probe fields is attributed to its coupling to a strong laser field generating an off-resonant gain through an induced nonlinearity in the other probe field. Both the advantages and disadvantages as well as the limitations of the ODRDC, EIT, PFG, and AWI effects are discussed and compared.