Multiphoton Effects Enhanced due to Ultrafast Photon-Number Fluctuations.
Multiphoton Effects Enhanced due to Ultrafast Photon-Number Fluctuations.
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DOI：
10.1103/physrevlett.119.223603
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发表时间：
2017-05
影响因子：
8.6
通讯作者：
K. Spasibko;D. Kopylov;V. Krutyanskiy;T. Murzina;G. Leuchs;M. Chekhova
中科院分区：
文献类型：
--
作者：
K. Spasibko;D. Kopylov;V. Krutyanskiy;T. Murzina;G. Leuchs;M. Chekhova
n光子效应的速率通常与入射光的n阶自相关函数成比例，这对于具有强光子数波动的光是高的。因此，“噪声”光源比具有相同平均功率、脉冲持续时间和重复率的相干光源对于多光子效应更有效。在这里，我们从明亮的压缩真空中产生2-4阶的光学谐波，这种光的状态仅由量子噪声组成，没有相干分量。我们观察到高达2个数量级的增强，由于超快光子数波动的光学谐波的产生。这一特性对于脆弱结构的非线性光学尤其重要，在这种情况下，使用有噪声的泵浦可以在不超过损伤阈值的情况下显著增加效果。
The rate of an n-photon effect generally scales as the nth order autocorrelation function of the incident light, which is high for light with strong photon-number fluctuations. Therefore, "noisy" light sources are much more efficient for multiphoton effects than coherent sources with the same mean power, pulse duration, and repetition rate. Here we generate optical harmonics of the order of 2-4 from a bright squeezed vacuum, a state of light consisting of only quantum noise with no coherent component. We observe up to 2 orders of magnitude enhancement in the generation of optical harmonics due to ultrafast photon-number fluctuations. This feature is especially important for the nonlinear optics of fragile structures, where the use of a noisy pump can considerably increase the effect without overcoming the damage threshold.