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We report on laser cooling of a large fraction of positronium (Ps) infree-flight by strongly saturating the $1^3S$-$2^3P$ transition with abroadband, long-pulsed 243 nm alexandrite laser. The ground state Ps cloud isproduced in a magnetic and electric field-free environment. We observe twodifferent laser-induced effects. The first effect is an increase in the numberof 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 a58(9) % increase in the coldest fraction of the Ps ensemble.

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