Optimized coupling of cold atoms into a fiber using a blue-detuned hollow-beam funnel

Details Optimized coupling of cold atoms into a fiber using a blue-detuned hollow-beam funnel Optimized coupling of cold atoms into a fiber using a blue-detuned hollow-beam funnel

2011-07-24

arxiv.org/abs/1107.4746v1

Physics

Atomic Physics

11 pages, 12 figures, 1 table

Scientific paper

We theoretically investigate the process of coupling cold atoms into the core of a hollow-core photonic-crystal optical fiber using a blue-detuned Laguerre-Gaussian beam. In contrast to the use of a red-detuned Gaussian beam to couple the atoms, the blue-detuned hollow-beam can confine cold atoms to the darkest regions of the beam thereby minimizing shifts in the internal states and making the guide highly robust to heating effects. This single optical beam is used as both a funnel and guide to maximize the number of atoms into the fiber. In the proposed experiment, Rb atoms are loaded into a magneto-optical trap (MOT) above a vertically-oriented optical fiber. We observe a gravito-optical trapping effect for atoms with high orbital momentum around the trap axis, which prevents atoms from coupling to the fiber: these atoms lack the kinetic energy to escape the potential and are thus trapped in the laser funnel indefinitely. We find that by reducing the dipolar force to the point at which the trapping effect just vanishes, it is possible to optimize the coupling of atoms into the fiber. Our simulations predict that by using a low-power (2.5 mW) and far-detuned (300 GHz) Laguerre-Gaussian beam with a 20-{\mu}m radius core hollow-fiber it is possible to couple 11% of the atoms from a MOT 9 mm away from the fiber. When MOT is positioned further away, coupling efficiencies over 50% can be achieved with larger core fibers.

Affiliated with

Also associated with

No associations

Rating

Optimized coupling of cold atoms into a fiber using a blue-detuned hollow-beam funnel does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Optimized coupling of cold atoms into a fiber using a blue-detuned hollow-beam funnel, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optimized coupling of cold atoms into a fiber using a blue-detuned hollow-beam funnel will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-76567