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Controlling pulse delay by light and low magnetic fields: slow light in emerald induced by transient spectral hole-burning

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Abstract

Slow light based on transient spectral hole-burning is reported for emerald, Be3Al2Si6O18:Cr3+. Experiments were conducted in π polarization on the R1(±3/2) line (E2A24) at 2.2 K in zero field and low magnetic fields Bc. The hole width was strongly dependent on Bc, and this allowed us to smoothly tune the pulse delay from 40 to 154 ns between zero field and Bc=15.2mT. The latter corresponds to a group velocity of 16km/s. Slow light in conjunction with a linear filter theory can be used as a powerful and accurate technique in time-resolved spectroscopy, e.g., to determine spectral hole-widths as a function of time.

© 2013 Optical Society of America

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