DOE OSTI · 3021652
Outlook for active plasma spectroscopy with entangled two-photon absorption
Abstract
Entangled two-photon absorption (ETPA) exhibits a quantum-enhanced two-photon absorption cross-section and a linear scaling with incident power that exceeds classical two-photon absorption (TPA) at low photon flux. Here, we assess the feasibility and applications of ETPA for active plasma spectroscopy. The ETPA-absorbed power for an Ar + species in a helicon plasma scenario is calculated to be as high as 0.6 nW cm −1 along the incident beam path for nondegenerate-entangled photon pairs that are near-resonant with an intermediate level. The ETPA absorption power exceeds classical TPA and Bremsstrahlung emission, a necessary condition for a feasible fluorescence measurement. Applications of ETPA plasma spectroscopy may include trace impurity detection, ground-state excitation, and continuous-wave pumping for high-bandwidth turbulence measurements. Possible benefits of plasma measurements are less harm to optical components with lower incident flux and reduced stray light that can contaminate optical diagnostics.
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Smith, David R. [Univ. of Wisconsin, Madison, WI (United States)] (ORCID:0000000309723638), Vishwanath, Nivedan [Univ. of Wisconsin, Madison, WI (United States)], Zepp, Michael [Univ. of Wisconsin, Madison, WI (United States)] (ORCID:0000000170389160), Beuting, Matthias [Univ. of Wisconsin, Madison, WI (United States)] (ORCID:0000000206624848), Hartog, Daniel J. Den [Univ. of Wisconsin, Madison, WI (United States)], Geiger, Benedikt [Univ. of Wisconsin, Madison, WI (United States)] (ORCID:0000000187061874), Sanders, Scott T. [Univ. of Wisconsin, Madison, WI (United States)], Yang, Xuting [Univ. of Wisconsin, Madison, WI (United States)], Choy, Jennifer T. [Univ. of Wisconsin, Madison, WI (United States)] (ORCID:0000000286893801). 2025-12-18. Outlook for active plasma spectroscopy with entangled two-photon absorption. https://doi.org/10.1088/1361-6463%2Fae161f
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