: 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}.
Positronium Laser Cooling via the 13S−23P Transition with a Broadband Laser Pulse / Glöggler, L. T., Gusakova, N., Rienäcker, B., Camper, A., Caravita, R., Huck, S., Volponi, M., Wolz, T., Penasa, L., Krumins, V., Gustafsson, F. P., Comparat, D., Auzins, M., Bergmann, B., Burian, P., Brusa, R. S., Castelli, F., Cerchiari, G., Ciuryło, R., Consolati, G., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 132:8(2024), p. 083402. [10.1103/physrevlett.132.083402]
Positronium Laser Cooling via the 13S−23P Transition with a Broadband Laser Pulse
Caravita, R.;Volponi, M.;Penasa, L.;Brusa, R. S.;Guatieri, F.;Mariazzi, S.;Povolo, L.;
2024-01-01
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}.| File | Dimensione | Formato | |
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PhysRevLett.132.083402.pdf
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