光的合作光的散射引起的辐射压的修正
Modification of radiation pressure due to cooperative scattering of light
摘要:
来自N原子云的单个光子的合作自发发射实质上改变了由远失谐激光束激发原子所施加的辐射压力。一方面,由光子吸收引起的力依赖于激发态原子的集体衰变率。另一方面,定向自发发射抵消了由吸收引起的反冲。我们推导了稳态辐射压的解析表达式。对于一个平滑的扩展原子分布,我们表明,辐射压力依赖于通过合作散射的原子数,并在某些原子数,它可以被抑制或增强。
英文摘要:
Cooperative spontaneous emission of a single photon from a cloud of N atoms modifies substantially the radiation pressure exerted by a far-detuned laser beam exciting the atoms. On one hand, the force induced by photon absorption depends on the collective decay rate of the excited atomic state. On the other hand, directional spontaneous emission counteracts the recoil induced by the absorption. We derive an analytical expression for the radiation pressure in steady-state. For a smooth extended atomic distribution we show that the radiation pressure depends on the atom number via cooperative scattering and that, for certain atom numbers, it can be suppressed or enhanced.
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