Diffracted field distributions from the HE11 mode in a hollow optical fibre for an atomic funnel

Details Diffracted field distributions from the HE11 mode in a hollow optical fibre for an atomic funnel Diffracted field distributions from the HE11 mode in a hollow optical fibre for an atomic funnel

Jun 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003joptb...5..300n&link_type=abstract

Journal of Optics B: Quantum and Semiclassical Optics, Volume 5, Issue 3, pp. 300-308 (2003).

Physics

Optics

1

Scientific paper

The diffracted near field distribution from an LP01 mode in a hollow optical fibre was recently calculated using a scalar model based on the weakly waveguiding approximation (Yoo et al 1999 J. Opt. B: Quantum Semiclass. Opt. 1 364). It showed a dominant Gaussian-like distribution with an increased axial intensity in the central region (not a doughnut-like distribution), so the diffracted output beam from the hollow fibre cannot be used to form an atomic funnel. Using exact solutions of the Maxwell equations based on a vector model, however, we calculate the electric field and intensity distributions of the HE11 mode in the same hollow fibre and study the diffracted near- and far-field distributions of the HE11-mode output beam under the Fresnel approximation. We analyse and compare the differences between the output beams from the HE11 and LP01 modes. Our study shows that both the near- and far-field intensity distributions of the HE11-mode output beam are doughnut-like and can be used to form a simple atomic funnel. However, it is not suitable to use the weakly waveguiding approximation to calculate the diffracted near-field distribution of the hollow fibre due to the greater refractive-index difference between the hollow region (n0 = 1) and the core (n1 = 1.45 or 1.5). Finally, the 3D intensity distribution of the HE11-mode output beam is modelled and the corresponding optical potentials for cold atoms are calculated. Some potential applications of the HE11-mode output beam in an atomic guide and funnel are briefly discussed.

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