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SYLA: Symposium New Trends in Laser Systems and their Applications for Photonic Quantum Systems and Emerging Technologies

SYLA 2: Laser Sources for Emerging Technologies – Enabling the Future

SYLA 2.3: Invited Talk

Wednesday, March 4, 2026, 15:30–16:00, HS 20

Advancements in Infrared Spectroscopy with Undetected Photons — •Chiara Lindner and Frank Kühnemann — Fraunhofer Institute for Physical Measurement Techniques IPM, Freiburg, Germany

Correlated photon pairs offer innovative approaches to infrared spectroscopy, allowing for high-resolution measurements using only visible light detection. This technique addresses the limitations of traditional infrared detectors, such as speed, cost, and noise. Key element is the quantum interference effects of correlated photon pairs created by spontaneous parametric down-conversion (SPDC) within a nonlinear interferometer. Combining this quantum technology with established Fourier-Transform Infrared Spectroscopy methods (then referred to as Q-FTIR) enables high-performance infrared spectroscopy. This research paves the way for future applications and new research fields such as quantum hyperspectral imaging. In this talk, we will cover the fundamentals of measurements with undetected photons, discuss recent implementations for infrared spectroscopy and take an outlook.

Keywords: Infrared Spectroscopy; Quantum Imaging; Photonics; Nonlinear Optics