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在泵光为窄带或宽带的情形下,对四能级系统中极化拍频的不对称特性进行了研究,发现这种不对称特性是由于光学元件色散所导致的零延时的漂移引起的.We have studied the asymmetric behavior of the polarization beats in a four-level system when the pump beams have either narrowband or broadband linewidth, we attribute this asymmetry to the shift of the zero time delay which is due to the dispersion of the optical components.
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