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Positronium Laser Cooling via the 13S−23P Transition with a Broadband Laser Pulse

Published:2024-02-22 Issue:8 Volume:132 Page:
ISSN:0031-9007
Container-title:Physical Review Letters
language:en
Short-container-title:Phys. Rev. Lett.

Author:

Glöggler L. T.¹^ORCID,Gusakova N.¹²^ORCID,Rienäcker B.³^ORCID,Camper A.⁴^ORCID,Caravita R.⁵^ORCID,Huck S.¹⁶^ORCID,Volponi M.¹⁷⁵^ORCID,Wolz T.¹^ORCID,Penasa L.⁷⁵^ORCID,Krumins V.¹⁸^ORCID,Gustafsson F. P.¹^ORCID,Comparat D.⁹^ORCID,Auzins M.⁸^ORCID,Bergmann B.¹⁰^ORCID,Burian P.¹⁰^ORCID,Brusa R. S.⁷⁵^ORCID,Castelli F.¹¹¹²^ORCID,Cerchiari G.¹³^ORCID,Ciuryło R.¹⁴^ORCID,Consolati G.¹¹¹⁵^ORCID,Doser M.¹^ORCID,Graczykowski Ł.¹⁶^ORCID,Grosbart M.¹^ORCID,Guatieri F.⁷⁵^ORCID,Haider S.¹,Janik M. A.¹⁶^ORCID,Kasprowicz G.¹⁷^ORCID,Khatri G.¹^ORCID,Kłosowski Ł.¹⁴^ORCID,Kornakov G.¹⁶^ORCID,Lappo L.¹⁶,Linek A.¹⁴^ORCID,Malamant J.⁴^ORCID,Mariazzi S.⁷⁵^ORCID,Petracek V.¹⁸^ORCID,Piwiński M.¹⁴^ORCID,Pospíšil S.¹⁰^ORCID,Povolo L.⁷⁵^ORCID,Prelz F.¹¹^ORCID,Rangwala S. A.¹⁹^ORCID,Rauschendorfer T.¹²⁰^ORCID,Rawat B. S.³²¹^ORCID,Rodin V.³^ORCID,Røhne O. M.⁴^ORCID,Sandaker H.⁴^ORCID,Smolyanskiy P.¹⁰^ORCID,Sowiński T.²²^ORCID,Tefelski D.¹⁶^ORCID,Vafeiadis T.¹^ORCID,Welsch C. P.³²¹^ORCID,Zawada M.¹⁴^ORCID,Zielinski J.¹⁶^ORCID,Zurlo N.²³²⁴^ORCID,

Affiliation:

1. Physics Department, CERN, 1211 Geneva 23, Switzerland

2. Department of Physics, NTNU, Norwegian University of Science and Technology, Trondheim, Norway

3. Department of Physics, University of Liverpool, Liverpool L69 3BX, United Kingdom

4. Department of Physics, University of Oslo, Sem Sælandsvei 24, 0371 Oslo, Norway

5. TIFPA/INFN Trento, via Sommarive 14, 38123 Povo, Trento, Italy

6. Institute for Experimental Physics, Universität Hamburg, 22607 Hamburg, Germany

7. Department of Physics, University of Trento, via Sommarive 14, 38123 Povo, Trento, Italy

8. University of Latvia, Department of Physics Raina boulevard 19, LV-1586 Riga, Latvia

9. Université Paris-Saclay, CNRS, Laboratoire Aimé Cotton, 91405 Orsay, France

10. Institute of Experimental and Applied Physics, Czech Technical University in Prague, Husova 240/5, 110 00 Prague 1, Czech Republic

11. INFN Milano, via Celoria 16, 20133 Milano, Italy

12. Department of Physics “Aldo Pontremoli,” University of Milano, via Celoria 16, 20133 Milano, Italy

13. Institut für Experimentalphysik, University of Innsbruck, Technikerstrasse 25, 6020 Innsbruck, Austria

14. Institute of Physics, Faculty of Physics, Astronomy, and Informatics, Nicolaus Copernicus University in Torun, Grudziadzka 5, 87-100 Torun, Poland

15. Department of Aerospace Science and Technology, Politecnico di Milano, via La Masa 34, 20156 Milano, Italy

16. Warsaw University of Technology, Faculty of Physics, ul. Koszykowa 75, 00-662 Warsaw, Poland

17. Warsaw University of Technology, Faculty of Electronics and Information Technology, ul. Nowowiejska 15/19, 00-665 Warsaw, Poland

18. Czech Technical University, Prague, Brehova 7, 11519 Prague 1, Czech Republic

19. Raman Research Institute, C. V. Raman Avenue, Sadashivanagar, Bangalore 560080, India

20. Felix Bloch Institute for Solid State Physics, Universität Leipzig, 04103 Leipzig, Germany

21. The Cockcroft Institute, Daresbury, Warrington WA4 4AD, United Kingdom

22. Institute of Physics, Polish Academy of Sciences, Aleja Lotnikow 32/46, PL-02668 Warsaw, Poland

23. INFN Pavia, via Bassi 6, 27100 Pavia, Italy

24. Department of Civil, Environmental, Architectural Engineering and Mathematics, University of Brescia, via Branze 43, 25123 Brescia, Italy

Abstract

We report on laser cooling of a large fraction of positronium (Ps) in free flight by strongly saturating the 13S−23P 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 23P 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 v1D<3.7×104 ms−1.

Published by the American Physical Society

2024

Funder

Istituto Nazionale di Fisica Nucleare Sezione di Padova

HORIZON EUROPE Marie Sklodowska-Curie Actions

Engineering and Physical Sciences Research Council

Norges Forskningsråd

Politechnika Warszawska

High Energy Physics

Narodowe Centrum Nauki

Horizon 2020 Framework Programme

Bundesministerium für Bildung und Forschung