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Gigahertz-bandwidth optical memory in Pr3+:Y2SiO5

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Abstract

We experimentally study a broadband implementation of the atomic frequency comb (AFC) rephasing protocol with a cryogenically cooled ${{\rm Pr}^{3 +}}:{{\rm Y}_2}{{\rm SiO}_5}$ crystal. To allow for storage of broadband pulses, we explore a novel, to the best of our knowledge, regime where the input photonic bandwidth closely matches the inhomogeneous broadening of the material $(\sim 5 \;{\rm GHz})$, thereby significantly exceeding the hyperfine ground and excited state splitting $(\sim 10 \;{\rm MHz})$. Through an investigation of different AFC preparation parameters, we measure a maximum efficiency of 10% after a rephasing time of 12.5 ns. With a suboptimal AFC, we witness up to 12 rephased temporal modes.

© 2021 Optical Society of America

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Supplementary Material (1)

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Supplement 1       Supplemental document

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Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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