Double-Slit Interference with Partially-Coherent Light

E. L. Cleveland

QU Biao

Adopting the technique of different position probes into the spectrum of partially coherent light,study the spectral shift and spectral switch of partially coherent polychromatic light in Young′s double-slit experiment.The experimental results show that,in the interference field,the normalized spectrum is redshifted at some observation points,is blueshifed at others,and the spectral shift changes rapidly from red shift to blueshifted at the critical points,i.e.,the spectral switch occurs.Furthermore,it is shown that the slit parameter and observation distance effect on the spectral shift and the spectral switch in Young's double-slit interference experiment.

Itamar Vidal Silva de Lima

In this thesis we investigate, experimentally and theoretically, many classical and quantum coherence effects of the light. Initially we investigate the interference patterns formation by nonlocal double slit using classical light sources and comparing the results with those using a twin photos light source generated by Spontaneous Parametric Down Conversion (SPDC). We demonstrate that the classical correlation in wave vectors, in beam splitter outs, is a sufficient condition to the interference pattern to exist. In this work we also investigate experimentally the influence of polarized nonlocal double slit and local double slit. Here is present a alternative Fano based interpretation to explain the reason why the polarization of correlated beam has not influence on pattern fringes. We presented also an investigation about the light source parameters influence on the ghost interference interference. We demonstrate experimentally the relationship between, the coherence and source size, and fringes visibility. We extended the concept of complementarity related to coherence and correlation using the changes of the reference beam coherence and observing it’s influence on the interference patterns of the local double slit. In near-field limit, we investigate the existence of conditionality in the wave vector limited by the aperture of objects placed on the classically correlated beams paths. We demonstrate that is possible to find conditionality between the light emitted through the slits apertures. All these experiments performed using the Brown Twiss intensity interferometer (HBT) served to investigate the difference between the transversal effects with quantum and classical incoherent light. Finally, we demonstrate the first experimental measurement demonstrating the polarization changes on the partially coherent light propagation induced by the coherence source changes. This phenomenom was investigated for the free space propagation and for a nonlinear medium modeled by a Kerr medium.

G S Egorov, S.N. Mensov, Nikolai S. Stepanov

Ralph F. Baierlein, Vacek Miglus

Hui Hua Peng

Young’s double slit experiments have been interpretated by the optical wave theory. The observation of the wave behavior of the light near the detecting screen has long history. Recently we have shown the particle nature of the light near the detecting screen (the far field) in the wave experiments. In this article, we place two shields near the double slit to explore the nature of light. The experiment shows that, near the double slit, the light behaves as photons, propagates along the straight-line trajectories. The portion of the light, which directly passing through the channel formed by Shield-1 and Shield-2, produces the interference pattern at the central portion of the pattern. While the portions of the light, which are reflected multi-times by Shield-1 and Shield-2 respectively, produce the left pattern and the right pattern at the left-side and the right-side of the interference pattern respectively. The left pattern and the right pattern are not interference pattern. This novel double slit experiments provide comprehensive phenomena for further developing the theory to interpret the experiments.