论文标题
黄色$ \ mathrm {cu_2o} $ rydberg系列的自我kerr效应
Self-Kerr effect across the yellow $\mathrm{Cu_2O}$ Rydberg series
论文作者
论文摘要
我们研究了$ \ mathrm {cu_2o} $中Rydberg Invicons诱导的非线性折射。使用高精度干涉成像技术在空间上解析非线性相移，我们观察到在每个激光器强度非常低的激光强度附近，在每个激光元共振附近都显着转移。由此，我们得出了非线性索引$ \ mathrm {n_2} $，呈现$ \ mathrm {n_2} $ spectrum $ n \ geq 5 $的spectrum，并报告大$ \ $ \ mathrm {n_2} $ of Ofder $ 10^{ - 3} $ mm $^2 $/mw。此外，我们观察到Kerr非线性的快速饱和，发现饱和强度$ \ Mathrm {i_ {sat}} $减少为$ n^{ - 7} $。我们用Rydberg封锁机制来解释这一点，从而巨大的Rydberg相互作用限制了激子密度，从而导致我们的设置中最大的相移为0.5 RAD。
We investigate the nonlinear refraction induced by Rydberg excitons in $\mathrm{Cu_2O}$. Using a high-precision interferometry imaging technique that spatially resolves the nonlinear phase shift, we observe significant shifts at extremely low laser intensity near each exciton resonance. From this, we derive the nonlinear index $\mathrm{n_2}$, present the $\mathrm{n_2}$ spectrum for $n\geq 5$ and report large $\mathrm{n_2}$ values of order $10^{-3}$ mm$^2$/mW. Moreover, we observe a rapid saturation of the Kerr nonlinearity and find that the saturation intensity $\mathrm{I_{sat}}$ decreases as $n^{-7}$. We explain this with the Rydberg blockade mechanism, whereby giant Rydberg interactions limit the exciton density, resulting in a maximum phase shift of 0.5 rad in our setup.
