论文标题
强烈，连续的冷原子来源
An Intense, Continuous Cold Atom Source
论文作者
论文摘要
我们证明了通过$^7 $ li原子的超音速氦气喷射的喷嘴播种产生的强烈，连续的冷原子束。喷嘴冷却至约4.4 K，以降低原子的正向速度。原子束通过直径为10厘米的磁性己酮镜头将焦点远离喷嘴175厘米。焦点的吸收和荧光成像显示$ 2.3（4）\ times 10^{12} $原子/s，亮度为$ 4.1（7）\ times 10^{19} $ $ $ $ \ textrm {M}^{m}速度为211（2）m/s，纵向温度为7（3）MK。结果与对种子动力学的蒙特卡洛模拟和原子晶状体的粒子追踪模拟一致。我们预测，通过改进的真空系统设计，将可能增加10倍的通量。我们的方法应为原子光学和其他原子和分子物理应用提供有用的高亮度来源。
We demonstrate an intense, continuous cold atom beam generated via post nozzle seeding of a supersonic helium jet with $^7$Li atoms. The nozzle is cooled to about 4.4 K to reduce the forward velocity of the atoms. The atomic beam is brought to a focus 175 cm from the nozzle by a 10 cm bore diameter magnetic hexapole lens. Absorption and fluorescence imaging of the focus show a flux of $2.3(4) \times 10^{12}$ atoms/s, brightness of $4.1(7)\times 10^{19}$ $\textrm{m}^{-2}\textrm{s}^{-1}\textrm{sr}^{-1}$, forward velocity of 211(2) m/s, and longitudinal temperature of 7(3) mK. Results agree with a Monte Carlo simulation of the seeding dynamics and a particle tracing simulation of the atom lens. We project that 10 times higher flux would be possible with improved vacuum system design. Our method should provide a useful high-brightness source for atom-optical and other atomic and molecular physics applications.
