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. 2024 Feb 23;132(8):083402.
doi: 10.1103/PhysRevLett.132.083402.

Positronium Laser Cooling via the 1^{3}S-2^{3}P Transition with a Broadband Laser Pulse

L T Glöggler  1 , N Gusakova  1   2 , B Rienäcker  3 , A Camper  4 , R Caravita  5 , S Huck  1   6 , M Volponi  1   5   7 , T Wolz  1 , L Penasa  5   7 , V Krumins  1   8 , F P Gustafsson  1 , D Comparat  9 , M Auzins  8 , B Bergmann  10 , P Burian  10 , R S Brusa  5   7 , F Castelli  11   12 , G Cerchiari  13 , R Ciuryło  14 , G Consolati  11   15 , M Doser  1 , Ł Graczykowski  16 , M Grosbart  1 , F Guatieri  5   7 , S Haider  1 , M A Janik  16 , G Kasprowicz  17 , G Khatri  1 , Ł Kłosowski  14 , G Kornakov  16 , L Lappo  16 , A Linek  14 , J Malamant  4 , S Mariazzi  5   7 , V Petracek  18 , M Piwiński  14 , S Pospíšil  10 , L Povolo  5   7 , F Prelz  11 , S A Rangwala  19 , T Rauschendorfer  1   20 , B S Rawat  3   21 , V Rodin  3 , O M Røhne  4 , H Sandaker  4 , P Smolyanskiy  10 , T Sowiński  22 , D Tefelski  16 , T Vafeiadis  1 , C P Welsch  3   21 , M Zawada  14 , J Zielinski  16 , N Zurlo  23   24 ; AEḡIS Collaboration
Affiliations
Free article

Positronium Laser Cooling via the 1^{3}S-2^{3}P Transition with a Broadband Laser Pulse

L T Glöggler et al. Phys Rev Lett. .
Free article

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}.

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