Linearly aligned superradiant Bose-Einstein condensates diffracted by a single short laser pulse
Linearly aligned superradiant Bose-Einstein condensates diffracted by a single short laser pulse
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线性排列的超辐射玻色-爱因斯坦凝聚体被单个短激光脉冲衍射
DOI：
10.1103/physreva.87.043627
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发表时间：
2013
影响因子：
2.9
通讯作者：
and Atsuo Morinaga
中科院分区：
文献类型：
--
作者：
Ichiro Inano;Keisuke Nakamura;and Atsuo Morinaga
在磁阱中，用单一的单向短激光脉冲沿雪茄状钠超辐射凝聚体的长轴辐照产生了多阶双向超辐射玻色-爱因斯坦凝聚体（BECs）。用贝塞尔函数的平方很好地解释了衍射bec的概率与激光强度的关系，估计末射光束的强度为激光强度的25倍。当脉冲时间大于5 μs时，由于能量守恒，后向衍射消失。当反向衍射消失时，一阶衍射发生的概率随脉冲时间的延长呈指数增长。我们观察到沿激光束传播方向线性排列的衍射BECs，而不考虑冷凝物的长径比。这一事实表明，端射光束是由真空窗的小反射光触发的。
Multiorder bidirectional superradiant Bose-Einstein condensates (BECs) were generated in a straight line by an irradiation of a single unidirectional short laser pulse along the long axis of a cigar-shaped sodium BEC in a magnetic trap. The probabilities of the diffracted BECs as a function of the laser intensity were well explained by the square of the Bessel functions and it was estimated that the intensity of the end-fire beam was 25of the laser intensity. The backward diffractions disappeared at pulse duration longer than 5 μs because of energy conservation. The probability for thefirst-order diffraction grew exponentially with pulse duration when the backward diffractions disappeared. We observed the linearly aligned diffracted BECs along the propagation direction of the laser beam, regardless of the aspect ratio of the condensates. This fact indicates that the end-fire beam is triggered by the small backreflection from the vacuum window.