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Doppler broadening in thermal ensembles degrades the absorption cross-sectionand the coherence time of collective excitations. In two photon transitions, itis common to assume that this problem becomes worse with larger wavelengthmismatch. Here we identify an opposite mechanism, where such wavelengthmismatch leads to cancellation of Doppler broadening via the counteractingeffects of velocity-dependent light-shifts and Doppler shifts. We show thatthis effect is general, common to both absorption and transparency resonances,and favorably scales with wavelength mismatch. We experimentally confirm theenhancement of transitions for different low-lying orbitals in rubidium atomsand use calculations to extrapolate to high-lying Rydberg orbitals. Thesecalculations predict a dramatic enhancement of up to 20-fold increase inabsorption, even in the presence of large homogeneous broadening. More generalconfigurations, where an auxiliary dressing field is used to counteract Dopplerbroadening, are also discussed and experimentally demonstrated. The mechanismwe study can be applied as well for rephasing of spin waves and increasing thecoherence time of quantum memories.

Power narrowing: Counteracting Doppler broadening in two-color transitions