Positronium laser cooling via the $1^3S$-$2^3P$ transition with a broadband laser pulse

L. T. Glöggler; N. Gusakova; B. Rienäcker; A. Camper; R. Caravita; S. Huck; M. Volponi; T. Wolz; L. Penasa; V. Krumins; F. Gustafsson; M. Auzins; B. Bergmann; P. Burian; R. S. Brusa; F. Castelli; R. Ciuryło; D. Comparat; G. Consolati; M. Doser; Ł. Graczykowski; M. Grosbart; F. Guatieri; S. Haider; M. A. Janik; G. Kasprowicz; G. Khatri; Ł. Kłosowski; G. Kornakov; L. Lappo; A. Linek; J. Malamant; S. Mariazzi; V. Petracek; M. Piwiński; S. Pospisil; L. Povolo; F. Prelz; S. A. Rangwala; T. Rauschendorfer; B. S. Rawat; V. Rodin; O. M. Røhne; H. Sandaker; P. Smolyanskiy; T. Sowiński; D. Tefelski; T. Vafeiadis; C. P. Welsch; M. Zawada; J. Zielinski; N. Zurlo

arXiv · 2310.08760

Positronium laser cooling via the $1^3S$-$2^3P$ transition with a broadband laser pulse

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Abstract

We report on laser cooling of a large fraction of positronium (Ps) in free-flight by strongly saturating the $1^3S$-$2^3P$ transition with a broadband, long-pulsed 243 nm alexandrite laser. The ground state Ps cloud is produced in a magnetic and electric field-free environment. We observe two different laser-induced effects. The first effect is an increase in the number of atoms in the ground state after the time Ps has spent in the long-lived $3^3P$ states. The second effect is the one-dimensional Doppler cooling of Ps, reducing the cloud's temperature from 380(20) K to 170(20) K. We demonstrate a 58(9) % increase in the coldest fraction of the Ps ensemble.

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L. T. Glöggler, N. Gusakova, B. Rienäcker, A. Camper, R. Caravita, S. Huck, M. Volponi, T. Wolz, L. Penasa, V. Krumins, F. Gustafsson, M. Auzins, B. Bergmann, P. Burian, R. S. Brusa, F. Castelli, R. Ciuryło, D. Comparat, G. Consolati, M. Doser, Ł. Graczykowski, M. Grosbart, F. Guatieri, S. Haider, M. A. Janik, G. Kasprowicz, G. Khatri, Ł. Kłosowski, G. Kornakov, L. Lappo, A. Linek, J. Malamant, S. Mariazzi, V. Petracek, M. Piwiński, S. Pospisil, L. Povolo, F. Prelz, S. A. Rangwala, T. Rauschendorfer, B. S. Rawat, V. Rodin, O. M. Røhne, H. Sandaker, P. Smolyanskiy, T. Sowiński, D. Tefelski, T. Vafeiadis, C. P. Welsch, M. Zawada, J. Zielinski, N. Zurlo. 2023-10-12. Positronium laser cooling via the $1^3S$-$2^3P$ transition with a broadband laser pulse. https://arxiv.org/abs/2310.08760

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