= Mark Kasevich
{c}
{tag=Physicist}
<Mark Kasevich> and <Steven Chu> demonstrated an <atom interferometer> using stimulated <Raman transitions>. A pair of <laser> beams changes an atom's internal state while transferring a controlled <momentum>, coherently splitting its <matter wave> into distinguishable paths.
Later pulses redirect and recombine the paths. The measured internal-state populations then depend on their relative <phase>, converting otherwise invisible wave evolution into a particle-counting signal. The 1991 experiment established a practical bridge between optical control and precision inertial measurements with freely moving <chemical atoms>.<Atomic interferometry using stimulated Raman transitions by Mark Kasevich and Steven Chu>[Abstract and pulse sequence: coherent splitting, momentum transfer and interference]{ref}
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