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High-Brightness Sources and Light-Driven Interactions

Electron to photon noise transfer in mid-infrared lasers

Irene La Penna, Tecla Gabbrielli, Francesco Cappelli, Paolo De Natale, Georg Marschick, Robert Weih, Borislav Hinkov

Published Jan 1, 2024• 0 citations
Publisher

Abstract

We investigate the noise transfer from injected electrons to emitted photons in coherent mid-infrared (MIR) sources with the aim of finding the best fitting conditions for detection of squeezed light in the MIR.
DOI
10.1364/mics.2024.mw3c.6

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The emissions of two identical spontaneous parametric down-conversion (SPDC) sources pumped coherently, e.g. with the same beam (c.f. Fig. 1(a)), show interference in both, the signal and idler light. This phenomenon results from the indistinguishability of the photon pairs emitted by the identical sources [1]. If a medium between the two SPDC sources absorbs the idler light, the photon pairs from the first and second SPDC source become distinguishable and the interference contrast decreases for both, signal and idler light. By measuring the signal light spectrum in the visible or near-infrared (NIR) range and the corresponding interference contrast, we obtain the information about the idler light absorption of the analyte in the mid-infrared (MIR). Hereby, we enable spectroscopy in the MIR using a standard silicon detector, making detection easier and more efficient than using typical MIR detectors [2].