: We report on laser cooling of a large fraction of positronium (Ps) in free flight by strongly saturating the 1^{3}S-2^{3}P 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 2^{3}P states. The second effect is one-dimensional Doppler cooling of Ps, reducing the cloud's temperature from 380(20) to 170(20) K. We demonstrate a 58(9)% increase in the fraction of Ps atoms with v_{1D}<3.7×10^{4} ms^{-1}.
Positronium Laser Cooling via the 13S−23P Transition with a Broadband Laser Pulse / Glöggler, L. T.; Gusakova, N.; Rienäcker, B.; Camper, A.; Caravita, R.; Huck, S.; Volponi, M.; Wolz, T.; Penasa, L.; Krumins, V.; Gustafsson, F. P.; Comparat, D.; Auzins, M.; Bergmann, B.; Burian, P.; Brusa, R. S.; Castelli, F.; Cerchiari, G.; Ciuryło, R.; Consolati, G.; Doser, M.; Graczykowski, Ł.; Grosbart, M.; Guatieri, F.; Haider, S.; Janik, M. A.; Kasprowicz, G.; Khatri, G.; Kłosowski, Ł.; Kornakov, G.; Lappo, L.; Linek, A.; Malamant, J.; Mariazzi, S.; Petracek, V.; Piwiński, M.; Pospíšil, S.; Povolo, L.; Prelz, F.; Rangwala, S. A.; Rauschendorfer, T.; Rawat, B. S.; Rodin, V.; Røhne, O. M.; Sandaker, H.; Smolyanskiy, P.; Sowiński, T.; Tefelski, D.; Vafeiadis, T.; Welsch, C. P.; Zawada, M.; Zielinski, J.; Zurlo, N.; Null, Null. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 132:8(2024), p. 083402. [10.1103/physrevlett.132.083402]
Positronium Laser Cooling via the 13S−23P Transition with a Broadband Laser Pulse
Caravita, R.;Volponi, M.;Penasa, L.;Brusa, R. S.;Guatieri, F.;Mariazzi, S.;Povolo, L.;
2024-01-01
Abstract
: We report on laser cooling of a large fraction of positronium (Ps) in free flight by strongly saturating the 1^{3}S-2^{3}P 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 2^{3}P states. The second effect is one-dimensional Doppler cooling of Ps, reducing the cloud's temperature from 380(20) to 170(20) K. We demonstrate a 58(9)% increase in the fraction of Ps atoms with v_{1D}<3.7×10^{4} ms^{-1}.| File | Dimensione | Formato | |
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