1. Positronium laser cooling via the $1^3S$-$2^3P$ transition with a broadband laser pulse
- Author
-
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., Graczykowski, Ł., 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., 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., Graczykowski, Ł., 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., and Zurlo, N.
- Abstract
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., Comment: 6 pages, 5 figures
- Published
- 2023