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Prof. Thom Efthimiopoulos Group Research Activities

Coherent control of the emission channels in laser-atoms or molecules interaction.

An optimum selection of the excitation scheme can lead to a controllable enhanced response of the emissions and also the selection among the available relaxation paths of nonlinear media such as atomic metal vapor of potassium, chosen for its well-known spectroscopy and the low-lying energy states to be reached by lasers in the visible.

The proposed coherent control scheme can be implemented with a V- or Λ-type, properly time separated pump-coupling pulses configuration, driving set of pump-coupling pulses, in the ns, ps and fs regions.

This research leads to the significant enhancement of the emitted emissions, the selection control of the emission channels and the measurement of the atomic states quantum coherent relaxation time (CRT).

The (2+1) photon ionization in potassium, under high intensity femtosecond laser pulses, and quantum interference effects.

In tight focusing conditions the two-photon resonant three-photon ionization, due to either the direct coupling to the continuum or the initial population transfer to the excited level 6S1/2, is able to modify the emitted radiations of the atomic relaxation paths and the ionization can affect the system response with respect to the emissions and their dynamics in a single pump or a pump-coupling excitation in a Λ-type scheme. These effects are currently studied theoretically and experiments are planned as well.

VUV coherent radiation generation from rare gas dimers

Short-wavelength (< 200nm) vacuum UV radiation (VUV) is generated from the first excited electronic state relaxation of rare gas molecules, produced in the ground state by an adiabatic expansion of rare gas atoms, that are subsequently excited by electron collisions from a low voltage dc electric discharge. Parameters related to the emission such as the gas adiabatic expansion, the dimmer molecule formation, the singlet-triplet states mixing, the second continuum efficient production in a single or multiple expansion nozzle, are investigated, in order to achieve a prototype coherent source unit, initially from the Ar or Xe diners at 126 nm or 174 nm.

This research area is very important with potential applications such as: new lasers in the VUV region, laser spectroscopy, microelectronics, satellite intercommunication, material processing and surface or sterilization. 

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