Speeding up particle slowing using shortcuts to adiabaticity
Speeding up particle slowing using shortcuts to adiabaticity
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DOI：
10.1103/physreva.102.043107
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发表时间：
2020-07
影响因子：
2.9
通讯作者：
J. Bartolotta;J. T. Reilly;M. Holland
中科院分区：
文献类型：
--
作者：
J. Bartolotta;J. T. Reilly;M. Holland
我们提出了一种通过激光场使粒子减速的方法，该方法可能具有产生大的力的能力，而不会产生自发散射光子的随机方向引起的相关动量扩散。在这种方法中，时间分辨的激光脉冲与周期性修改失谐地址ultransarrow电子跃迁，通过重复的吸收和受激发射周期，以减少粒子的动量。我们实现了一个捷径绝热方法，是基于刘易斯-Riesenfeld不变理论。这为我们的方案提供了绝热转移的优点，其中可以存在对所施加的场的精确强度和失谐特性的固有不敏感性，具有获得短的慢化距离所必需的快速转移的优点。对于产生具有米每秒量级的中心速度的粒子束的热炉源的典型参数，这可能导致在小于一毫米内将粒子减慢到接近静止。我们比较了广泛实施的慢下来的技术，依赖于辐射压力的慢下来的计划，并显示出潜在的优势时，激发态衰减率很小。因此，该方案是一个特别有前途的候选人，以减缓窄线宽系统，缺乏封闭的循环过渡，如发生在某些分子。
We propose a method for slowing particles by laser fields that potentially has the ability to generate large forces without the associated momentum diffusion that results from the random directions of spontaneously scattered photons. In this method, time-resolved laser pulses with periodically modified detunings address an ultranarrow electronic transition to reduce the particle momentum through repeated absorption and stimulated emission cycles. We implement a shortcut to adiabaticity approach that is based on Lewis-Riesenfeld invariant theory. This affords our scheme the advantages of adiabatic transfer, where there can be an intrinsic insensitivity to the precise strength and detuning characteristics of the applied field, with the advantages of rapid transfer that is necessary for obtaining a short slowing distance. For typical parameters of a thermal oven source that generates a particle beam with a central velocity on the order of meters per second, this could result in slowing the particles to near stationary in less than a millimeter. We compare the slowing scheme to widely-implemented slowing techniques that rely on radiation pressure forces and show the advantages that potentially arise when the excited state decay rate is small. Thus, this scheme is a particularly promising candidate to slow narrow-linewidth systems that lack closed cycling transitions, such as occurs in certain molecules.