We investigate the fourth-order spatial correlation properties of pseudo-thermal light in the photon counting regime, and apply the Klyshko advanced-wave picture to describe the process of four-photon coincidence coun...We investigate the fourth-order spatial correlation properties of pseudo-thermal light in the photon counting regime, and apply the Klyshko advanced-wave picture to describe the process of four-photon coincidence counting measurement. We deduce the theory of a proof-of-principle four-photon coincidence counting configuration, and find that if the four randomly radiated photons come from the same radiation area and are indistinguishable in principle, the fourth-order correlation of them is 24 times larger than that when four photons come from different radiation areas. In addition, we also show that the higher-order spatial correlation function can be decomposed into multiple lower-order correlation functions, and the contrast and visibility of low-order correlation peaks are less than those of higher orders, while the resolutions all are identical. This study may be useful for better understanding the four-photon interference and multi-channel correlation imaging.展开更多
We theoretically investigate the interaction of two in-phase and out-of-phase Peregrine sofitons in a Kerr nonlinear medium, addressing both the cases of first- and second-order solitons. Upon adjusting the interval b...We theoretically investigate the interaction of two in-phase and out-of-phase Peregrine sofitons in a Kerr nonlinear medium, addressing both the cases of first- and second-order solitons. Upon adjusting the interval between the sofitons, their interactions exhibit different properties. If the interval is sufficiently large, two Peregrine sofitons will propagate individually and will not interact each other. However, if the interval is not very large, the Peregrine solitons will strongly interact and display varying behavior.展开更多
Accelerating beams have been the subject of extensive research in the last few decades because of their selfacceleration and diffraction-free propagation over several Rayleigh lengths.Here,we investigate the propagati...Accelerating beams have been the subject of extensive research in the last few decades because of their selfacceleration and diffraction-free propagation over several Rayleigh lengths.Here,we investigate the propagation dynamics of a Fresnel diffraction beam using the nonlocal nonlinear Schrodinger equation(NNLSE).When a nonlocal nonlinearity is introduced into the linear Schrodinger equation without invoking an external potential,the evolution behaviors of incident Fresnel diffraction beams are modulated regularly,and certain novel phenomena are observed.We show through numerical calculations,under varying degrees of nonlocality,that nonlocality significantly affects the evolution of Fresnel diffraction beams.Further,we briefly discuss the two-dimensional case as the equivalent of the product of two one-dimensional cases.At a critical point,the Airy-like intensity profile oscillates between the first and third quadrants,and the process repeats during propagation to yield an unusual oscillation.Our results are expected to contribute to the understanding of NNLSE and nonlinear optics.展开更多
Polarization dependence of the enhancement and suppression of four-wave mixing （FWM） in a multi- Zeeman level atomic system is investigated both theoretically and experimentally. A dressing field applied to the adja...Polarization dependence of the enhancement and suppression of four-wave mixing （FWM） in a multi- Zeeman level atomic system is investigated both theoretically and experimentally. A dressing field applied to the adjacent transition can cause energy level splitting. Therefore, it can control the enhancement and suppression of the FWM processes in the system due to the effect of electromagnetically induced transparency. The results show that the pumping beams with different polarizations select the transitions between different Zeeman levels that, in turn, affect the enhancement and suppression efficiencies of FWM.展开更多
基金Supported by the National Basic Research Program of China under Grant No 2012CB921804the National Natural Science Foundation of China under Grant Nos 61078002,61078020,11104214,61108017,11104216 and 61205112+2 种基金the Research Funds for the Doctoral Program of Higher Education of China under Grant Nos 20110201110006,20110201120005 and 20100201120031the Fundamental Research Funds for the Central Universities of Ministry of Education of China under Grant Nos 2012jdhz05,2011jdhz07,xjj2011083,xjj2011084,xjj2012080 and xjj2013089the China Postdoctoral Science Foundation under Grant No2012M521773
文摘为与伪 thermal 光来源一起的第四顺序的双裂缝鬼干扰的一个计划被建议。可见性能戏剧性地不仅与第三顺序的盒子相比被提高，而且如果我们以一样的速度在相反的方向扫描三个参考察觉者中的二个，更高的分辨率被表明，这被显示出，同时二在一个参考察觉者的速度的相同方向两次其它。结果证明第四顺序的鬼干扰穗的可见性和分辨率改进能被用于 N th 顺序鬼成像。
基金Supported by the National Basic Research Program of China under Grant No 2012CB921804, the National Natural Science Foundation of China under Grant Nos 61078002, 61078020, 11104214, 61108017, 11104216 and 61205112, the Specialized Research Fund for the Doctoral Program of Higher Education of China under Grant Nos 20110201110006, 20110201120005 and 20100201120031, the Fundamental Research Funds for the Central Universities of Ministry of Education of China under Grant Nos 2012jdhz05, 2011jdhz07, xjj2011083, xjj2011084, xjj2012080 and xjj2013089, and the China Postdoctoral Science Foundation under Grant No 2012M521773.
文摘We investigate the fourth-order spatial correlation properties of pseudo-thermal light in the photon counting regime, and apply the Klyshko advanced-wave picture to describe the process of four-photon coincidence counting measurement. We deduce the theory of a proof-of-principle four-photon coincidence counting configuration, and find that if the four randomly radiated photons come from the same radiation area and are indistinguishable in principle, the fourth-order correlation of them is 24 times larger than that when four photons come from different radiation areas. In addition, we also show that the higher-order spatial correlation function can be decomposed into multiple lower-order correlation functions, and the contrast and visibility of low-order correlation peaks are less than those of higher orders, while the resolutions all are identical. This study may be useful for better understanding the four-photon interference and multi-channel correlation imaging.
基金Supported by the China Postdoctoral Science Foundation under Grant No 2012M521773, the National Natural Science Foun- dation of China under Grant Nos 61308015, 61078002, 61078020, 11104214 and 61205112, and the Science and Technology Plan of Shaanxi Province under Grant Nos CX12189WL02 and CX12189WL03.
文摘We theoretically investigate the interaction of two in-phase and out-of-phase Peregrine sofitons in a Kerr nonlinear medium, addressing both the cases of first- and second-order solitons. Upon adjusting the interval between the sofitons, their interactions exhibit different properties. If the interval is sufficiently large, two Peregrine sofitons will propagate individually and will not interact each other. However, if the interval is not very large, the Peregrine solitons will strongly interact and display varying behavior.
基金Project supported by the National Natural Science Foundation of China(Grant Nos.61805068,61875053,and 62074127)China Postdoctoral Science Foundation(Grant No.2017M620300)the Fund from the Science and Technology Department of Henan Province,China(Grant No.202102210111).
文摘Accelerating beams have been the subject of extensive research in the last few decades because of their selfacceleration and diffraction-free propagation over several Rayleigh lengths.Here,we investigate the propagation dynamics of a Fresnel diffraction beam using the nonlocal nonlinear Schrodinger equation(NNLSE).When a nonlocal nonlinearity is introduced into the linear Schrodinger equation without invoking an external potential,the evolution behaviors of incident Fresnel diffraction beams are modulated regularly,and certain novel phenomena are observed.We show through numerical calculations,under varying degrees of nonlocality,that nonlocality significantly affects the evolution of Fresnel diffraction beams.Further,we briefly discuss the two-dimensional case as the equivalent of the product of two one-dimensional cases.At a critical point,the Airy-like intensity profile oscillates between the first and third quadrants,and the process repeats during propagation to yield an unusual oscillation.Our results are expected to contribute to the understanding of NNLSE and nonlinear optics.
基金supported by the National Natural Science Foundation of China (Nos. 10974151, 61078002, and 61078020)the New Century Excellent Talent of Ministry of Education of China (No. 08-0431)the Cross-Disciplinary Project of Xi'an Jiaotong University (Nos. 2009xjtujc08, XJJ20100100, and XJJ20100151)
文摘Polarization dependence of the enhancement and suppression of four-wave mixing （FWM） in a multi- Zeeman level atomic system is investigated both theoretically and experimentally. A dressing field applied to the adjacent transition can cause energy level splitting. Therefore, it can control the enhancement and suppression of the FWM processes in the system due to the effect of electromagnetically induced transparency. The results show that the pumping beams with different polarizations select the transitions between different Zeeman levels that, in turn, affect the enhancement and suppression efficiencies of FWM.
