Interference coherent excitation in two crystals

Владилен Владимирович Окороков, D.L. Tolchenkov, I. S. Khizhnyakov +4 more

Takeshi Ogasawara, Makoto Kuwata‐Gonokami

We observed the interference of coherently excited biexcitons in a CuCl crystal by double pulse four-wave mixing. Interference is observed even when the two excitation pulses are orthogonally polarized clearly demonstrating the scalar-wave nature of biexcitons.

A. V. Burlakov, Давид Николаевич Клышко, S. P. Kulik +2 more

Interference is observed between the spontaneous parametric radiation from two nonlinear crystals separated by a macroscopic air gap and excited in series by a common pump beam. The phase of the interference depends on the phase shifts at three frequencies. A simple quantum model agrees well with the experimental results and makes it possible to interpret the effect in terms of general vacuum fluctuations which give rise to the spontaneous emission of mutually coherent radiation from the two crystals.

Владилен Владимирович Окороков

Sebastian Wolf, Julian Wechs, Joachim von Zanthier +1 more

We observe interference in the light scattered from trapped ^{40}Ca^{+} ion crystals. By varying the intensity of the excitation laser, we study the influence of elastic and inelastic scattering on the visibility of the fringe pattern and discriminate its effect from that of the ion temperature and wave-packet localization. In this way we determine the complex degree of coherence and the mutual coherence of light fields produced by individual atoms. We obtain interference fringes from crystals consisting of two, three, and four ions in a harmonic trap. Control of the trapping potential allows for the adjustment of the interatomic distances and thus the formation of linear arrays of atoms serving as a regular grating of microscopic scatterers.