Abstract

Slow light based on transient spectral hole-burning is reported for emerald, ${\mathrm{Be}}_3{\mathrm{Al}}_2{\mathrm{Si}}_6{\mathrm{O}}_{18}:{\mathrm{Cr}}^{3+}$. Experiments were conducted in $\pi$ polarization on the $R_1(\pm 3/2)$ line (${}^2\mathrm{E}\leftarrow {}^4{\mathrm{A}}_2$) at 2.2 K in zero field and low magnetic fields $\mathrm{B}\Vert \mathrm{c}$. The hole width was strongly dependent on $\mathrm{B}\Vert \mathrm{c}$, and this allowed us to smoothly tune the pulse delay from 40 to 154 ns between zero field and $\mathrm{B}\Vert \mathrm{c}=15.2\mathrm{mT}$. The latter corresponds to a group velocity of $16\mathrm{km}/\mathrm{s}$. 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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