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Auzins, M. Doser, M. Grosbart, M. Piwi\\'nski, M. Volponi, M. Zawada, N. Gusakova, N. Zurlo, O. M. R{\\o}hne, P. Burian, P. Smolyanskiy, R. Caravita, R. Ciury{\\l}o, R. S. Brusa, S. A. Rangwala, S. Haider, S. Huck, S. Mariazzi, S. Pospisil, T. Rauschendorfer, T. Sowi\\'nski, T. Vafeiadis, T. Wolz, V. Krumins, V. Petracek, V. Rodin","submitted_at":"2023-10-12T23:00:01Z","abstract_excerpt":"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. 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Camper, A. Linek, B. Bergmann, B. Rien\\\"acker, B. S. Rawat, C. P. Welsch, D. Comparat, D. Tefelski, F. Castelli, F. Guatieri, F. Gustafsson, F. Prelz, G. Consolati, G. Kasprowicz, G. Khatri, G. Kornakov, H. Sandaker, J. Malamant, J. Zielinski, \\L. Graczykowski, {\\L}.K{\\l}osowski, L. Lappo, L. Penasa, L. Povolo, L. T. Gl\\\"oggler, M. A. Janik, M. Auzins, M. Doser, M. Grosbart, M. Piwi\\'nski, M. Volponi, M. Zawada, N. Gusakova, N. Zurlo, O. M. R{\\o}hne, P. Burian, P. Smolyanskiy, R. Caravita, R. Ciury{\\l}o, R. S. Brusa, S. A. Rangwala, S. Haider, S. Huck, S. Mariazzi, S. Pospisil, T. Rauschendorfer, T. Sowi\\'nski, T. Vafeiadis, T. Wolz, V. Krumins, V. Petracek, V. Rodin","submitted_at":"2023-10-12T23:00:01Z","abstract_excerpt":"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. 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