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We demonstrate that spin-exchange dephasing of Larmor precession atnear-earth-scale fields is effectively eliminated by dressing the alkali-metalatom spins in a sequence of AC-coupled 2-pi pulses, repeated at the Larmorprecession frequency. The contribution of spin-exchange collisions to thespectroscopic line width is reduced by a factor of the duty cycle of thepulses. We experimentally demonstrate resonant transverse pumping in magneticfields as high as 0.1 Gauss, present experimental measurements of thesuppressed spin-exchange relaxation, and show enhanced magnetometer responserelative to a light-narrowed scalar magnetometer.

Suppression of Spin-Exchange Relaxation Using Pulsed Parametric Resonance