Mixing of Light Beams in Crystals

A. V. Shubnikov

Nickolai V. Bogodaev, N. M. Polozkov, Vladimir V. Shkunov +2 more

We demonstrate that two-wave mixing of partially coherent light beams inside a medium with an inertial nonlinear response allows one to increase the coherence substantially. An increase of the coherence function from 0.24 to 0.94 is demonstrated experimentally in SBN:Ce crystal.

Helmut Ritsch

Satchi Kumari, Alika K. Khare

The slowing down of light in Ce:BaTiO3at room temperature via degenerate two-wave mixing for chopped pulses is reported. Delay of 0.9 ms is observed for chopped pulses of duration 8 ms, corresponding to a group velocity of 5.5 m/s. Effect of pulse width of signal beam and pump intensity onto the slowing down action of light in the crystal is studied. The building up and decay time of photo grating is also recorded as a function of pump beam intensity.

Ioannis Caltzidis, Harald Kübler, Tilman Pfau +2 more

We demonstrate an atomic Faraday dichroic beam splitter suitable for spatially separating signal and idler fields from pump degenerate four-wave mixing in an atomic source. By rotating the plane of polarization of one mode ${90}^{\ensuremath{\circ}}$ with respect to the other, a subsequent polarizing beam splitter separates the two frequencies, which differ by only 13.6 GHz, and achieves a suppression of $(\ensuremath{-}26.3\ifmmode\pm\else\textpm\fi{}0.1)$ and $(\ensuremath{-}21.2\ifmmode\pm\else\textpm\fi{}0.1)$ dB in the two outputs, with a corresponding transmission of 97% and 99%, respectively. This technique avoids the necessity of using spatial separation of four-wave mixing modes and thus opens the door for enhancing the process efficiency in waveguide experiments. As a proof of principle, we generate light via four-wave mixing in $^{87}\mathrm{Rb}$ loaded into a hollow-core photonic crystal fiber and interface it with the atomic Faraday dichroic beam splitter.

Crispin W. Gardiner