Coherent control of spin–orbit precession with shaped laser pulses

摘要: Spin precession in rubidium atoms is investigated through a pump–probe technique. The excited wave packet corresponds to of spin and orbital angular momentum around the total momentum. We show that using shaped laser pulses allows us control this dynamics. With Fourier transform limited pulse, initially prepared bright state (coupled initial state) whereas pulse presenting π step spectral phase prepares dark (uncoupled state).