arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1606.07658physics.atom-phphysics.optics
收藏

大团冷原子云的噪声光谱学

Noise spectroscopy with large clouds of cold atoms

Samir Vartabi Kashanian, Aurélien Eloy, William Guerin, Michel Lintz, Mathilde Fouché, Robin Kaiser

摘要:

噪声测量是研究从激光特性到光的量子行为等诸多现象的有力工具。在本文中,我们报告的强度噪声测量时获得的激光束传输通过一个大的冷原子云。虽然这种测量可能会调查复杂的过程,如原子运动的影响,一个是首先受到限制的转换的固有激光频率噪声强度噪声通过原子共振。这种转换在这里详细研究。我们表明,虽然实验强度噪声谱崩溃到同一曲线在低傅立叶频率,出现一些差异,在较高的频率时,探测光束从中心的共振线失谐。一个简单的模型,基于平均场的方法,对应于描述的原子云的介电磁化率,是足以理解的主要特征。利用这个模型,噪声谱允许提取一些定量信息的激光噪声以及原子样品。

英文摘要:

Noise measurement is a powerful tool to investigate many phenomena from laser characterization to quantum behavior of light. In this paper, we report on intensity noise measurements obtained when a laser beam is transmitted through a large cloud of cold atoms. While this measurement could possibly investigate complex processes such as the influence of atomic motion, one is first limited by the conversion of the intrinsic laser frequency noise to intensity noise via the atomic resonance. This conversion is studied here in details. We show that, while experimental intensity noise spectra collapse onto the same curve at low Fourier frequencies, some differences appear at higher frequencies when the probe beam is detuned from the center of the resonance line. A simple model, based on a mean-field approach, which corresponds to describing the atomic cloud by a dielectric susceptibility, is sufficient to understand the main features. Using this model, the noise spectra allow extracting some quantitative informations on the laser noise as well as on the atomic sample.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑