Extended Data Fig. 5: Simulated Doppler profile resulting from the laser cooling in the present experiment.
From: Cooling positronium to ultralow velocities with a chirped laser pulse train
The curve shows the simulated result 125 ns after the production of Ps. The uncertainty in the spectral width of the probe pulse and the resultant uncertainty in assessing the non-cooled fraction contribute to the thickness of the curve. The dotted curve is the calculated Doppler profile at 600 K without laser cooling. Both curves are normalised with respect to the Doppler profile at 0 ns without laser cooling.
