Light-wave mixing and scattering with quantum gases

23rd International Laser Physics Workshop

Deng, L.^1 ; Hagley, E.W.^1 ; Zhu, C.J.^2

National Institute of Standards and Technology, Gaithersburg

MD

20899, United States^1

School of Physical Science and Engineering, Tongji University, Shanghai

200092, China^2

关键词: Efficient process;    Elementary excitations;    Light fields;    Nonlinear optical process;    Optical process;    Optical waves;    Stimulated Raman;    Structure factors;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/594/1/012011/pdf
DOI  :  10.1088/1742-6596/594/1/012011

来源: IOP

【 摘 要 】

We show that optical processes originating from elementary excitations with dominant collective atomic recoil motion in a quantum gas can profoundly change many nonlinear optical processes routinely observed in a normal gas. Not only multi-photon wave mixing processes all become stimulated Raman or hyper-Raman in nature but the usual forward wave-mixing process, which is the most efficient process in normal gases, is strongly reduced by the condensate structure factor. On the other hand, in the backward direction the Bogoliubov dispersion automatically compensates the optical- wave phase mismatch, resulting in efficient backward light field generation that usually is not supported in normal gases.