Positronium laser cooling via the \(1^3S\)-\(2^3P\) transition with a broadband laser pulse

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 di...

Full description

Saved in:
Bibliographic Details
Published in:arXiv.org 2023-10
Main Authors: Glöggler, L T, Gusakova, N, Rienäcker, B, Camper, A, Caravita, R, Huck, S, Volponi, M, Wolz, T, Penasa, L, Krumins, V, Gustafsson, F, Auzins, M, Bergmann, B, Burian, P, Brusa, R S, Castelli, F, Ciuryło, R, Comparat, D, Consolati, G, Doser, M, \L Graczykowski, 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, Pospisil, 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
Format: Article
Language:English
Subjects:
Alexandrite
Atomic properties
Broadband
Doppler effect
Electric fields
Free flight
Ground state
Laser cooling
Positronium
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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.
ISSN:2331-8422