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.

中文翻译：

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使用绝热快捷方式加快粒子减速

我们提出了一种通过激光场来减慢粒子速度的方法，该方法潜在地具有产生大力的能力，而不会产生由自发散射的光子的随机方向引起的相关动量扩散。在这种方法中，具有周期性修改失谐的时间分辨激光脉冲可解决超窄电子跃迁，从而通过重复吸收和激发发射循环来降低粒子动量。我们实现了基于Lewis-Riesenfeld不变理论的绝热方法的捷径。这为我们的方案提供了绝热传递的优势，其中可能会对所施加场的精确强度和失谐特性产生固有的不敏感性，而快速传递的优势则是获得较短的减速距离所必需的。对于产生中心速度约为每秒米的粒子束的热炉源的典型参数，这可能导致将粒子减慢到接近静止状态的速度小于一毫米。我们将减速方案与依赖于辐射压力的广泛实施的减速技术进行了比较，并显示出当激发态衰减率较小时可能产生的优势。因此，该方案是减缓缺少闭合循环转变（例如某些分子中发生的循环）的窄线宽系统的特别有前途的候选者。我们将减速方案与依赖于辐射压力的广泛实施的减速技术进行了比较，并显示出当激发态衰减率较小时可能产生的优势。因此，该方案是减缓缺少闭合循环转变（例如某些分子中发生的循环）的窄线宽系统的特别有前途的候选者。我们将减速方案与依赖于辐射压力的广泛实施的减速技术进行了比较，并显示出当激发态衰减率较小时可能产生的优势。因此，该方案是减缓缺少闭合循环转变（例如某些分子中发生的循环）的窄线宽系统的特别有前途的候选者。