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.
Positronium Laser Cooling via the 13S−23P Transition with a Broadband Laser Pulse / L. . Glöggler, N. Gusakova, B. Rienäcker, A. Camper, R. Caravita, S. Huck, M. Volponi, T. Wolz, L. Penasa, V. Krumins, F. . Gustafsson, D. Comparat, M. Auzins, B. Bergmann, P. Burian, R. . Brusa, F. Castelli, G. Cerchiari, R. Ciuryło, G. Consolati, M. Doser, Ł. Graczykowski, M. Grosbart, F. Guatieri, S. Haider, M. . Janik, G. Kasprowicz, G. Khatri, Ł. Kłosowski, G. Kornakov, L. Lappo, A. Linek, J. Malamant, S. Mariazzi, V. Petracek, M. Piwiński, S. Pospíšil, L. Povolo, F. Prelz, S. . Rangwala, T. Rauschendorfer, B. . Rawat, V. Rodin, O. . Røhne, H. Sandaker, P. Smolyanskiy, T. Sowiński, D. Tefelski, T. Vafeiadis, C. . Welsch, M. Zawada, J. Zielinski, N. Zurlo, N. Null. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 132:8(2024 Feb 22), pp. 083402.1-083402.7. [10.1103/physrevlett.132.083402]
Positronium Laser Cooling via the 13S−23P Transition with a Broadband Laser Pulse
F. Castelli;
2024
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.File | Dimensione | Formato | |
---|---|---|---|
PhysRevLett.132.083402.pdf
accesso aperto
Tipologia:
Publisher's version/PDF
Dimensione
1.62 MB
Formato
Adobe PDF
|
1.62 MB | Adobe PDF | Visualizza/Apri |
Pubblicazioni consigliate
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.