Semiclassical limits to the linewidth of an atom laser

Details Semiclassical limits to the linewidth of an atom laser Semiclassical limits to the linewidth of an atom laser

2006-12-22

arxiv.org/abs/quant-ph/0612189v1

Physics

Quantum Physics

9 Figures

Scientific paper

We investigate the linewidth of a quasi-continuous atom laser within a semiclassical framework. In the high flux regime, the lasing mode can exhibit a number of undesirable features such as density fluctuations. We show that the output therefore has a complicated structure that can be somewhat simplified using Raman outcoupling methods and energy-momentum selection rules. In the weak outcoupling limit, we find that the linewidth of an atom laser is instantaneously Fourier limited, but, due to the energy `chirp' associated with the draining of a condensate, the long-term linewidth of an atom laser is equivalent to the chemical potential of the condensate source. We show that correctly sweeping the outcoupling frequency can recover the Fourier-limited linewidth.

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