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Nonlinear Optics

Area dependence of chirped-pulse stimulated Brillouin scattering

Mark Dong, Herbert G. Winful

Published Jan 1, 2015• 1 citation
Publisher

Abstract

We show that chirped pulses can enhance the formation of Brillouin dynamic gratings as well as the storage and retrieval of information. The process is analogous to adiabatic rapid passage in two-level systems.
DOI
10.1364/nlo.2015.nf1a.3

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Brillouin dynamic gratings have applications ranging from sensing to slow and stored light. When transform-limited pump pulses are used, the grating strength and the efficiency of light storage and retrieval are a periodic function of pulse area and can be zero for areas that are an integer multiple of π. In this paper the dependence of the dynamic grating strength and retrieval efficiency on pulse area is investigated for chirped pulses. It is found that the presence of chirp relaxes the requirement imposed on the pulse area that it be an odd multiple of π/2 for maximum efficiency. Analytical results are presented for the dependence of grating strength on the pulse area for both chirped and unchirped pulses. A comparison is made with the analogous process of adiabatic rapid passage in two-level atomic systems.
We present the experimental demonstration of a novel, efficient, and selective technique to prepare population inversion. The technique is an extension of Stark-chirped rapid adiabatic passage (SCRAP), i.e., SCRAP among three states. In this process a Lambda-type quantum system is driven by two laser pulses, the pump and Stokes pulses, which are appropriately detuned from transition frequencies. A third laser pulse induces a dynamic Stark shift in the upper energy level, and the timing of all three pulses is controlled in order to prepare population inversion between the two lower states in the Lambda-type level scheme. Our data on population transfer in nitric oxide (NO) molecules clearly show that SCRAP among three states provides an advantageous alternative to such techniques as stimulated Raman adiabatic passage.