Pre-excitation of Rb atoms by frequency chirped laser pulses for efficient plasma generation. G.P. Djotyan Wigner Centre for Physics of the Hungarian Academy of Sciences Contributors: D. Dzsotjan Zs. S örlei J. Bakos G. Demeter
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Wigner Centre for Physics of the Hungarian Academy of Sciences
Frequency chirped laser pulses and their application in manipulation of inner and translational states of multilevel atoms: some results achieved in the field in the Wigner Centre
Robust pre-excitation of Rb atoms by frequency chirped ultra-short laser pulses for efficient OBI or impact ionization
Coherent Population Transfer to a Target State Without Excitation of the Atom:Interaction of a singlefrequency chirped laser pulse with L –atom
G.P. Djotyan, J.S.Bakos, Zs. Sörlei, J.Szigeti, Phys.Rev.A, 70, 063406 (2004)
G.P. Djotyan, N. Sandor, J.S. Bakos, Zs. Sörlei, Opt. Express, 19, n. 18, 17493(2011)
The propagation distance X is measured in the units of the absorption length
G. Demeter, D. Dzsotjan, and G. P. Djotyan. Phys.Rev.A, 76, 023827 (2007)
J.S. Bakos, G.P. Djotyan, et al., Eur. Phys. J. D, 39, 59 (2006);
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GP. Djotyan, JS. Bakos, G. Demeter, PN. Ignacz, MA. Kedves, Zs. Sorlei, J. Szigeti, Z.Toth,Phys.Rev A, 68,053409 (2003)
Rb frequency-chirped laser pulses transition lines and the ionization scheme
Frequency chirped laser pulses may be successfully applied for pre-excitation of Rb atoms before further one-photon or over the barrier ionization by a strong laser pulse, or by the impact ionization. The pre-excitation of a gas of Rb atoms will drastically diminish the threshold of the ionization.
Advantages of using frequency chirped laser pulses:
i. Robustness of the atomic population transfer against variation of parameters of the laser radiation
ii. Applicability in both homogeneously and in-homogeneously broadened media, e.g. hot vapors (Doppler-broadening) or solid-state environment
ii. Ability to select a target state even in the case of broadband (e.g. ultra-short) laser pulses in the case of spectrally non-resolved manifold of atomic (molecular) energy levels.