论文标题
纠缠两光子吸收的空间特性
Spatial properties of entangled two-photon absorption
论文作者
论文摘要
我们在若丹明6g中实验研究了纠缠的两光子吸收，这是宽带纠缠光子对的高通量的空间特性的函数。我们首先证明了纠缠的两光子吸收率对纠缠的对磁通衰减的类型的关键特征依赖性：线性，当激光泵的功率减弱和二次磁通量时，二重型磁通本身会经历线性损失。然后，我们执行基于荧光的Z扫描测量，以研究束腰大小对纠缠两光子吸收过程的影响，并将其与经典的单次单光子吸收过程进行比较。我们证明，纠缠的两光子吸收具有与经典两光子吸收相似的束腰部依赖性。该结果为文献中染料中引用的两光子吸收横截面的广泛对比值提出了一个额外的论点。
We experimentally study entangled two-photon absorption in Rhodamine 6G as a function of the spatial properties of a high flux of broadband entangled photon pairs. We first demonstrate a key signature dependence of the entangled two-photon absorption rate on the type of entangled pair flux attenuation: linear, when the laser pump power is attenuated, and quadratic, when the pair flux itself experiences linear loss. We then perform a fluorescence-based Z-scan measurement to study the influence of beam waist size on the entangled two-photon absorption process and compare this to classical single- and two-photon absorption processes. We demonstrate that the entangled two-photon absorption shares a beam waist dependence similar to that of classical two-photon absorption. This result presents an additional argument for the wide range of contrasting values of quoted entangled two-photon absorption cross-sections of dyes in literature.
