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Chinese Physics Letters

Resonance-Radiation Force Exerted by a Circularly Polarized Light on an Atomic Wave Packet

叶永华, 曾高坚, 李锦茴

Published Jan 1, 2006• 0 citations
OpenAlex

Abstract

我们在一盏循环地极化的灯学习一个原子波浪包的行为，并且特别给循环地极化的光在回声条件下面在原子波浪包上施加的放射的力量的计算。计算的一个一般方法被介绍，结果有趣。例如，在波浪包是很狭窄的条件或 / 并且相互作用下面是很强壮的，当时间来临到无穷，不管原子是否开始处于它的扎根的状态或激动的状态，光在原子上施加的 theresonance 放射力量来临到零。如果原子分别地与概率 1/2 开始处于它的扎根的状态和激动的状态并且如果他们网膜密度是平功能，那么，回声放射力量在原子上由光施加了等于零。

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我们在一盏循环地极化的灯学习一个原子波浪包的行为，并且特别给循环地极化的光在回声条件下面在原子波浪包上施加的放射的力量的计算。计算的一个一般方法被介绍，结果有趣。例如，在波浪包是很狭窄的条件或 / 并且相互作用下面是很强壮的，当时间来临到无穷，不管原子是否开始处于它的扎根的状态或激动的状态，光在原子上施加的 theresonance 放射力量来临到零。如果原子分别地与概率 1/2 开始处于它的扎根的状态和激动的状态并且如果他们网膜密度是平功能，那么，回声放射力量在原子上由光施加了等于零。
We study the behaviour of an atomic wave packet in a circularly polarized light, and especially give the calculation of the radiative force exerted by the circularly polarized light on the atomic wave packet under the resonance condition. A general method of the calculation is presented and the result is interesting. For example, under the condition that the wave packet is very narrow or/and the interaction is very strong, no matter whether the atom is initially in its ground state or excited state, as time approaches to infinity, the resonance-radiation force exerted by the light on the atom approaches to zero. If the atom is initially in its ground state and excited state with the probability 1/2 respectively, and if the momentum density is a even function, then the resonance-radiation force exerted by the light on the atom is equal to zero.
We have developed a torsion balance to detect the rotation of a cell containing spin-polarized gaseous atoms to study angular momentum transfer from gaseous atoms to solid. A cesium vapor cell was hung from a thin wire in a vacuum chamber, and irradiated from the bottom with circularly polarized light tuned to the D2 transition to polarize cesium atoms in the cell. By varying the light helicity at the resonance frequency of the torsion balance, we induced forced rotational oscillation of the cell and detected radiation torque exerted on the cesium vapor cell through the cesium atoms inside. The torque was particularly large when both hyperfine levels of cesium atoms were optically pumped with application of a longitudinal magnetic field. Further detailed study will provide new insights into spin-transfer processes at the gas-solid interface.