Coherent Wavepackets of Phonons

Tao Zhou, Brad Richards, R. R. Jones

Lambertus D. Noordam, Henrik Stapelfeldt, D. I. Duncan +1 more

At the 1990 UFP conference the observation of several kinds of wave packets was reported [1]. All these wavepackets have in common that the wavefunction is localised due to a coherent superposition of eigenstates. The localised ‘particle’ evolves in course of time. The oscillation time of the wavepacket is determined by the inverse spacing of the states out of which the wavepacket is formed. We reported on the localisation of an atomic electron wavefunction by coherent superposition of Rydberg states. Also the observation of exciton wavepackets was reported, as well as the observations of optic phonons in the time domain. At an earlier conference the CalTech group reported already the observation of the oscillation of vibrational wavepackets in diatomic molecules [2].

Kazutaka G. Nakamura

H. W. de Wijn, Paul A. van Walree, A. F. M. Arts

Yuqiong Li, Zhenrong Sun, Shian Zhang +2 more

The authors achieved the temporal coherent control in an Er(3+)-doped telluride glass, one kind of disordered solids. The upconversion at 670 nm was modulated and the dephasing time was simulated as 300 fs. Moreover, the photon echo signal gave the dephasing time due to the phonon interaction. The agreement between the two data indicates that the interaction between the wavepacket and the phonon leads to the fast disappearance of wavepackets interference, which is helpful for the technique to be applied to the disordered solids.

Mizuho Fushitani, Matias Bargheer, Markus Gühr +1 more

Electronic and vibrational coherences of Cl2 embedded in solid Ar are investigated by exciting to the B state with a phase-locked pulse pair from an unbalanced Michelson interferometer, where the chirp difference matches the B state anharmonicity. Recording the A' --> X fluorescence after relaxation is compared to probing to charge transfer states by a third pulse. The three-pulse experiment delivers more details on the decoherence processes. The signal modulation due to phase tuning up to the third vibrational round-trip time indicates that the electronic coherence in the B <-- X transition is preserved for more than 660 fs in the solid Ar environment where many body electronic interactions take place. Vibrational coherence lasts longer than 3 ps according to the observed half revival of the wavepacket. Control of the coupling between wavepacket motion and lattice oscillation is demonstrated by tuning the relative phase between the phase-locked pulses, preparing wavepackets predominantly composed of either zero-phonon lines or phonon side bands.