原子中海森堡极限的逼近laser
Approaching the Heisenberg limit in an atom laser
摘要：
我们目前的实验和理论结果表明，改善光束质量和减少发散的原子激光器产生的光学拉曼过渡，相比由RF过渡。研究表明，拉曼外耦合可以消除凝聚体对外耦合原子的发散透镜效应。这大大提高了原子激光器的光束质量，并且对于具有紧密捕获电势的实验，这种改善可以大于十倍。我们表明，拉曼外耦合可以产生原子激光器的质量是唯一的限制由产生它们的凝聚体的波函数形状，通常是海森堡极限以上的1.3倍。
英文摘要：
We present experimental and theoretical results showing the improved beam quality and reduced divergence of an atom laser produced by an optical Raman transition, compared to one produced by an RF transition. We show that Raman outcoupling can eliminate the diverging lens effect that the condensate has on the outcoupled atoms. This substantially improves the beam quality of the atom laser, and the improvement may be greater than a factor of ten for experiments with tight trapping potentials. We show that Raman outcoupling can produce atom lasers whose quality is only limited by the wavefunction shape of the condensate that produces them, typically a factor of 1.3 above the Heisenberg limit.
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