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15 November 2024 Spatial and spectral peculiarities of spontaneous parametric down-conversion for classical and quantum spectroscopy
Jean-Michel Melkonian, Julien Le Goüet, Enguerran Belles, Jean-Baptiste Dherbecourt, Myriam Raybaut
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Proceedings Volume 13202, Quantum Technologies for Defence and Security; 132020E (2024) https://doi.org/10.1117/12.3031497
Event: Security + Defence, 2024, Edinburgh, United Kingdom
Abstract
Spontaneous Parametric Down-conversion (SPDC) is now routinely used to generate photon pairs for imaging, spectroscopy, and quantum information and metrology. However, the peculiar spectro-spatial properties of SPDC beams are not always known from the largest audience: they can give rise to ring-like beams, depending on the temperature, the wavelengths and pump focusing. This has to be considered for imaging or long-range applications. We will show examples of such beams created in 532-pumped PPLN or PPKTP and 1064-nm-pumped PPLN crystals. With a simple model of noncolinear phase matching we will give physical insight into the phenomena and explain the role of the signal/idler group delay. We will also explain how aperiodic crystals could be useful.
(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.
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Jean-Michel Melkonian, Julien Le Goüet, Enguerran Belles, Jean-Baptiste Dherbecourt, and Myriam Raybaut "Spatial and spectral peculiarities of spontaneous parametric down-conversion for classical and quantum spectroscopy", Proc. SPIE 13202, Quantum Technologies for Defence and Security, 132020E (15 November 2024); https://doi.org/10.1117/12.3031497
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KEYWORDS
Crystals
Spectroscopy
Quantum interferometry
Nonlinear optics
Optical parametric amplifiers
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