Pr $^{3+}$：Y $_2$ SiO $_5$中的千兆赫带宽光存储器
Gigahertz-Bandwidth Optical Memory in Pr$^{3+}$:Y$_2$SiO$_5$
摘要：
实验研究了低温冷却Pr $^{3+}$：Y $_2$ SiOPDMATHABMO晶体宽带实现原子频率梳（AFC）重定相方案.为了允许存储的宽带脉冲，我们探索了一种新的制度，其中输入光子带宽密切匹配的材料$(\sim5\,\textrm{GHz})$的非均匀加宽，从而显着超过超精细基态和激发态分裂$(\sim10\,\textrm{MHz})$。通过对不同AFC制备参数的研究，我们测量了在$12.5\,$ ns的再定相时间后$10\%$的最大效率。使用次优AFC，我们见证了多达12个重定相时间模式。
英文摘要：
We experimentally study a broadband implementation of the atomic frequency comb (AFC) rephasing protocol with a cryogenically cooled Pr$^{3+}$:Y$_2$SiO$_5$ crystal. To allow for storage of broadband pulses, we explore a novel regime where the input photonic bandwidth closely matches the inhomogeneous broadening of the material $(\sim5\,\textrm{GHz})$, thereby significantly exceeding the hyperfine ground and excited state splitting $(\sim10\,\textrm{MHz})$. 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.
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