Transverse laser modes in Bose-Einstein condensates
摘要
We examine the Bose-Einstein-condensate (BEC) equivalent of transverse aspects of laser resonators. We model numerically repeated focussing of a 2-dimensional BEC, which could be achieved in practice by a series of far off-resonant light pulses. We show for a range of non-linear coefficients that such a series of light pulses traps the BEC. We also model a combination of repeated focussing and loss, which could be achieved with a series of light pulses, some far off-resonant, some resonant. In analogy to light repeatedly being focussed and locally absorbed by passing through a laser resonator, a small proportion (in our model up to 10%) of the BEC is shaped into Hermite-Gaussian-like modes; the remainder of the BEC is lost. This happens irrespective of the presence of a harmonic trap. We show that astigmatic focussing of the resulting Hermite-Gaussian-like modes, which can be achieved by a pair of off-resonant light pulses, results in a specific number of vortices.
引用
@article{arxiv.cond-mat/0310702,
title = {Transverse laser modes in Bose-Einstein condensates},
author = {G. Whyte and P. Ohberg and J. Courtial},
journal= {arXiv preprint arXiv:cond-mat/0310702},
year = {2009}
}
备注
High resolution figures can be obtained from the authors