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arxiv: 2310.08760 · v1 · pith:ZBVSWZTJ · submitted 2023-10-12 · physics.atom-ph · hep-ex

Positronium laser cooling via the 1³S-2³P transition with a broadband laser pulse

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