Suppression of power-broadening in strong-coupling photoassociation in the presence of a Feshbach resonance

Details Suppression of power-broadening in strong-coupling photoassociation in the presence of a Feshbach resonance Suppression of power-broadening in strong-coupling photoassociation in the presence of a Feshbach resonance

2009-08-18

arxiv.org/abs/0908.2549v1

2009 J. Phys. B: At. Mol. Opt. Phys. 42 195202

Physics

Atomic Physics

12 pages, 5 figures

Scientific paper

10.1088/0953-4075/42/19/195202

Photoassociation (PA) spectrum in the presence of a magnetic Feshbach resonance is analyzed. Nonperturbative solution of the problem yields analytical expressions for PA linewidth and shift which are applicable for arbitrary PA laser intensity and magnetic field tuning of Feshbach Resonance. We show that by tuning magnetic field close to Fano minimum, it is possible to suppress power broadening at increased laser intensities. This occurs due to quantum interference of PA transitions from unperturbed and perturbed continuum. Line narrowing at high laser intensities is accompanied by large spectral shifts. We briefly discuss important consequences of line narrowing in cold collisions.

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