Separation estimation of two incoherent point sources using sum frequency generation.

Maxime Mertens; Ilya Karuseichyk; Romain Demur; Luc Leviandier; Arnaud Grisard; Nicolas Treps

doi:10.1117/12.3017599

20 June 2024 Separation estimation of two incoherent point sources using sum frequency generation.

Maxime Mertens, Ilya Karuseichyk, Romain Demur, Luc Leviandier, Arnaud Grisard, Nicolas Treps

Proceedings Volume PC13004, Nonlinear Optics and its Applications 2024; PC1300402 (2024) https://doi.org/10.1117/12.3017599
Event: SPIE Photonics Europe, 2024, Strasbourg, France

Abstract

In the context of separation estimation between two incoherent point sources, it has recently been shown that an optimal measurement strategy, which saturates the quantum Cramer-Rao bound, involves the use of spatial mode demultiplexing method (SPADE). To realize mode selective measurement required for SPADE, we propose a new approach based on sum frequency generation (SFG). The conversion of infrared light coming from two incoherent point sources is performed in a periodically-poled lithium niobate (PPLN) crystal by mean of a spatially shaped pump laser. By analyzing the converted images obtained with pump beams shaped as Hermite-Gaussian (HG) modes, we demonstrate the mode-sorting capabilities of this system. Our experiment, shows that our measurement method can estimate separations in sub-Rayleigh regime with improved accuracy compared to the traditional direct imaging method.

Conference Presentation

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Maxime Mertens, Ilya Karuseichyk, Romain Demur, Luc Leviandier, Arnaud Grisard, and Nicolas Treps "Separation estimation of two incoherent point sources using sum frequency generation.", Proc. SPIE PC13004, Nonlinear Optics and its Applications 2024, PC1300402 (20 June 2024); https://doi.org/10.1117/12.3017599

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KEYWORDS

Sum frequency generation

Crystals

Diffraction

Infrared radiation

Laser crystals

Quantum conversion

Quantum experiments

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