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Journal Article

Multiphoton Effects Enhanced due to Ultrafast Photon-Number Fluctuations

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Spasibko,  Kirill Yu.
Quantum Radiation, Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Leuchs,  Gerd
Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Chekhova,  Maria V.
Quantum Radiation, Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;
Chekhova Research Group, Research Groups, Max Planck Institute for the Science of Light, Max Planck Society;
Optical Technologies, Technology Development and Service Units, Max Planck Institute for the Science of Light, Max Planck Society;

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Citation

Spasibko, K. Y., Kopylov, D. A., Krutyanskiy, V. L., Murzina, T. V., Leuchs, G., & Chekhova, M. V. (2017). Multiphoton Effects Enhanced due to Ultrafast Photon-Number Fluctuations. PHYSICAL REVIEW LETTERS, 119(22): 223603. doi:10.1103/PhysRevLett.119.223603.


Cite as: https://hdl.handle.net/21.11116/0000-0000-836C-3
Abstract
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.