Optical coherent manipulation of excitonic polarization is studied in pulse-transmission experiments at medium to high excitation intensities. As a well-defined model system a ZnSe single-quantum well is used. It is found that for constant excitation intensities the dephasing time of the polarization in the sample changes significantly if the cases of coherent amplification and destruction are compared. This effect is explained in terms of an excitation-induced dephasing. The change of the dephasing time of the polarization is quantified. Furthermore, the simultaneous excitation of the exciton and exciton-biexciton resonances is shown to strongly influence the signal of the polarization in the coherent-control experiments. Both the excitation-induced dephasing and the biexcitonic effects are simulated by use of phenomenological models which give a good agreement with the experiments.Optical coherent manipulation of excitonic polarization is studied in pulse-transmission experiments at medium to high excitation intensities. As a well-defined model system a ZnSe single-quantum well is used. It is found that for constant excitation intensities the dephasing time of the polarization in the sample changes significantly if the cases of coherent amplification and destruction are compared. This effect is explained in terms of an excitation-induced dephasing. The change of the dephasing time of the polarization is quantified. Furthermore, the simultaneous excitation of the exciton and exciton-biexciton resonances is shown to strongly influence the signal of the polarization in the coherent-control experiments. Both the excitation-induced dephasing and the biexcitonic effects are simulated by use of phenomenological models which give a good agreement with the experiments.

Physical Review BMay 27, 200412 citations

Vacuum-induced coherence in ultracold photoassociative rovibrational excitations

Sumanta Das, Arpita Rakshit, Bimalendu Deb

We show that coherence between two excited rovibrational states belonging to the same molecular electronic configuration arises quite naturally due to their interaction with electromagnetic vacuum. For initial preparation of a molecule in the desired rovibrational states, we propose to employ the method of ultracold photoassociation. Spontaneous decay of the excited molecule then gives rise to vacuum-induced coherence between the excited ro-vibrational states. We demonstrate theoretically an interesting interplay of effects due to vacuum-induced coherence and photoassociation. We apply our theory to photoassociation of bosonic ytterbium ( ${}^{174}$ Yb) atoms, which appear to be a promising system for exploring such interplay. The effects discussed here can be important for controlling decoherence and dissipation in molecular systems.We show that coherence between two excited rovibrational states belonging to the same molecular electronic configuration arises quite naturally due to their interaction with electromagnetic vacuum. For initial preparation of a molecule in the desired rovibrational states, we propose to employ the method of ultracold photoassociation. Spontaneous decay of the excited molecule then gives rise to vacuum-induced coherence between the excited ro-vibrational states. We demonstrate theoretically an interesting interplay of effects due to vacuum-induced coherence and photoassociation. We apply our theory to photoassociation of bosonic ytterbium (${}^{174}$Yb) atoms, which appear to be a promising system for exploring such interplay. The effects discussed here can be important for controlling decoherence and dissipation in molecular systems.

arXiv:1109.0588Physical Review AJan 3, 201210 citations

Nonlinear Coherent Effects

Kōichi Shimoda

Springer series in optical sciences/SPringer series in optical sciencesJan 1, 19860 citations

Electromagnetically Induced Transparency and Gain under The Effect of Tuned Coupling Field

李晓莉 Li Xiaoli, 张连水 Zhang Lianshui, 杨悦 Yang Yue +1 more

Electromagnetically induced transparency(EIT) with extremely narrow spectral width is obtained in a well-studied lambda three level system where a coupling field and a probing field interact with two optical transitions.By tuning coupling field,it excites the transitions between two ground state hyperfine levels and excited state level.In this paper,both EIT and spontaneous radiation induced coherent dip can be obtained,and even the gain is observed to superpose to the EIT window.By discussing the behaviors of probing field absorption profiles under the effect of the tuned coupling field,it can be seen that there are quantum interference and coherence between EIT and spontaneous radiation induced coherent dip,and the coherence becomes remarkable when the excitation frequency of the coupling field satisfies certain conditions.Electromagnetically induced transparency(EIT) with extremely narrow spectral width is obtained in a well-studied lambda three level system where a coupling field and a probing field interact with two optical transitions.By tuning coupling field,it excites the transitions between two ground state hyperfine levels and excited state level.In this paper,both EIT and spontaneous radiation induced coherent dip can be obtained,and even the gain is observed to superpose to the EIT window.By discussing the behaviors of probing field absorption profiles under the effect of the tuned coupling field,it can be seen that there are quantum interference and coherence between EIT and spontaneous radiation induced coherent dip,and the coherence becomes remarkable when the excitation frequency of the coupling field satisfies certain conditions.

Chinese Journal of LuminescenceJan 1, 20110 citations

Coherent transient excitation

D. Grischkowsky

Optics CommunicationsJul 1, 19762 citations

{}^{174}

Yb) atoms, which appear to be a promising system for exploring such interplay. The effects discussed here can be important for controlling decoherence and dissipation in molecular systems.