Mapping the spatial and spectral modes of downconverted photons in angle phase-matched nonlinear crystals Article Swipe

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Evan J. Kumar , Lorenzo Uboldi , Cristian Manzoni , Giulio Cerullo , Ajay Ram Srimath Kandada ·

YOU? · · 2025 · Open Access · · DOI: https://doi.org/10.1364/opticaopen.29452184

Spontaneous Parametric Down-Conversion (SPDC) is key to generating broadband spectrally entangled photons for quantum optical spectroscopy. Here we use a a common-path birefringent interferometer to experimentally map the spatial-spectral mode structure of SPDC in Type I and II $\beta$-barium borate crystals using hyperspectral k-space imaging. Under broadband pulsed pumping, we observe strong spatial variations in the spectra, with distinct features for each phase-matching type. Simulations based on biphoton amplitudes and phase-matching conditions qualitatively match our results. This spatial-spectral mapping enables control over biphoton entanglement entropy, paving the way for optimized quantum light sources for material spectroscopy.

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Phase (matter) Photon Optics Physics Nonlinear system Quantum mechanics

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Type: preprint
Language: en
Landing Page: https://doi.org/10.1364/opticaopen.29452184
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DOI: https://doi.org/10.1364/opticaopen.29452184

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Title: Mapping the spatial and spectral modes of downconverted photons in angle phase-matched nonlinear crystals

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Type: preprint

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Language: en

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Publication year: 2025

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Publication date: 2025-07-02

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Authors: Evan J. Kumar, Lorenzo Uboldi, Cristian Manzoni, Giulio Cerullo, Ajay Ram Srimath Kandada

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Landing page: https://doi.org/10.1364/opticaopen.29452184

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OA URL: https://doi.org/10.1364/opticaopen.29452184

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Concepts: Phase (matter), Photon, Optics, Physics, Nonlinear system, Quantum mechanics

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