Efficiency optimization for atomic frequency comb storage

Abstract

We study the efficiency of the atomic frequency comb storage protocol. We show that for a given optical depth, the preparation procedure can be optimize to significantly improve the retrieval. Our prediction is well supported by the experimental implementation of the protocol in a ${\mathrm{Tm}}^{3+}$:YAG crystal. We observe a net gain in efficiency from 10 to $17%$ by applying the optimized preparation procedure. In the perspective of high bandwidth storage, we investigate the protocol under different magnetic fields. We analyze the effect of the Zeeman and superhyperfine interaction.