Mi Zhang, Melissa A. Guidry, R. Nicholas Lanning, Zhihao Xiao, Jonathan P. Dowling, Irina Novikova, Eugeniy E. Mikhailov
(Submitted on 8 May 2017 (v1), last revised 10 May 2017 (this version, v2))
We study a squeezed vacuum field generated in hot Rb vapor via the polarization self-rotation effect. Our previous experiments showed that the amount of observed squeezing may be limited by the contamination of the squeezed vacuum output with higher-order spatial modes, also generated inside the cell. Here, we demonstrate that the squeezing can be improved by making the light interact several times with a less dense atomic ensemble. With optimization of some parameters we can achieve up to -2.6 dB of squeezing in the multi-pass case, which is 0.6 dB improvement compared to the single-pass experimental configuration. Our results show that other than the optical depth of the medium, the spatial mode structure and cell configuration also affect the squeezing level.
|Comments:||7 pages, 8 figures|
|Subjects:||Atomic Physics (physics.atom-ph); Quantum Physics (quant-ph)|
|Journal reference:||Phys. Rev. A 96, 013835 (2017)|
|Cite as:||arXiv:1705.02914 [physics.atom-ph]|