Double γ-and optical resonance

G. P. Chugunova, Anatolii V. Mitin

Alan Corney

M. I. Shmiglyuk, A. I. Bobrysheva, V. Pavlov

The quantum beats (QB) in the time-dependent absorption intensity of the probe pulse and the spontaneous luminescence one in Cu2O crystal at the condition of double optical resonance are studied theoretically. It is assumed that the pump is performed by the CO2 laser pulse, which couples dynamically the 1s (Γ 5 + ) and 2p (Γ 4 - , Γ 5 - , Γ 3 - , Γ 2 - ) excitonic states and leads to their splitting into two or three quasienergy levels. The frequency of the probe pulse is in the region of the Γ 5 + exciton resonance. The respective intensities for different directions of the electric field E L of the pump, the polarization ξ of the probe pulse, and the observation q are obtained. The QB take place with the doubled Raby frequency, which at different E L , ξ, and q includes different sets of matrix elements of dipole transitions between 1s (Γ 5 + ) and 2p (Γ 4 - , Γ 5 - , Γ 3 - , Γ 2 - ) levels. These unknown matrix elements can be obtained, measuring the period of the QB.

Vlastimil Vrba, Michal Koutný, Jan Kočiščák +7 more

Coherent control of light and its interactions with matter is a key aspect of quantum optics. Nuclear resonant interactions enable coherent manipulation of photons at X-ray and γ -ray energies. One promising approach to manipulating γ -photons emitted by radioactive sources exploits ultrasonically vibrating nuclear resonant absorbers. However, previous studies have focused on unpolarized γ -radiation interacting with isotropic resonant media without exploiting polarization effects. Here, we demonstrate simultaneous temporal control of the waveform and polarization state of γ -photons by combining ultrasonic vibrations of magnetically ordered resonant absorbers with anisotropy in nuclear resonant scattering. This method allows interlinking phase differences of individual resonant interaction paths with their polarization dependence. A particular consequence is the possibility to form double-pulse γ -radiation sequences with tunable time-dependent polarization states. Using the reported method, coherent control of γ -photons can be expanded to polarization-based experiments and related applications in quantum optics can be further explored using a tabletop γ -optical setup.

R. M. Whitley

Nikolay N. Bogolubov, Tran Quang, A.S. Shumovsky