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Optics Communications

Super-radiance from a thin solid film of three-level atoms: local-field effects

Victor A Malyshev, Igor Viktorovich Ryzhov, Evgenii Dmitrievich Trifonov, А. И. Зайцев

Published Jun 1, 2000• 20 citations
Publisher
DOI
10.1016/s0030-4018(00)00678-7

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We analyze the superradiant emission with and without inversion from a thin film comprised of three-level atoms with the A-scheme of operating transitions. Since the thickness of the system is assumed to be smaller than the emission wavelength, the local-field correction to the acting field becomes of great importance and affects the three-level superradiance to a large extent. Due to this correction, a competition between the operating transitions occurs, resulting under suitable conditions in the suppression of one of them.

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE•Jan 14, 2000•2 citations
This chapter is devoted mainly to the description and theoretical interpretation of super-radiance experiments in a multi-proton spin system. It considers the simplest case of multi-spin super-radiance in a cavity. The spin magnetic moment in a static magnetic field is a perfect realization of the 'two-level' atomic model. In fact, this physical system was the origin of this model, and was extended to a wide class of resonant phenomena, including super-radiance. A refined description of super-radiance of magnetic spins in solids will probably have to take into account the dependence of the relaxation rate on the magnitude of the magnetization, using as a basis the concept of spin temperature. The chapter shows the limitations of the method of Bloch equations for describing NMR effects in solids, as mentioned earlier in the literature. It attempts to observe super-radiance in the radiofrequency domain was reported by P. Bosiger and their group, using a nuclear subsystem of Al atoms in ruby crystals.
This chapter introduces a three-level atomic model and discusses two other coherent atomic phenomena; namely, coherent Raman scattering and lasing without inversion. Lasing without inversion may take place in three-level resonant atomic systems and, like super-radiance, results from atomic coherence. Super-radiation is initiated by spontaneous fluctuations of the polarization in the medium. The semiclassical method is a powerful tool that is useful for the treatment of propagation effects in super-radiance as well as in such coherent emission processes as self-induced transparency, photon echo and others. The use of the Maxwell—Bloch equations allows one to consider these phenomena in elongated systems. Fortunately, the semiclassical approach is readily applicable to low-density systems that are to gases. However, one has to exercise greater care when applying it to coherent emission in solids. In high-density systems there is a strong mixing of the field and atomic states in the vicinity of resonance.
We analyze the superradiant emission with and without inversion from a thin film comprised of three-level atoms with the A-scheme of operating transitions. Since the thickness of the system is assumed to be smaller than the emission wavelength, the local-field correction to the acting field becomes of great importance and affects the three-level superradiance to a large extent. Due to this correction, a competition between the operating transitions occurs, resulting under suitable conditions in the suppression of one of them.