Multiphoton resonance in a three-level system with nearly degenerate excited states

Journal Article · Sun Aug 15 00:00:00 EDT 2010 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.82.023804· OSTI ID:21448568

Berent, M; Parzynski, R ^[1]

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1. Faculty of Physics, Adam Mickiewicz University, Umultowska 85, P-61-614 Poznan (Poland)

An analytic study is presented of the efficient multiphoton excitation and strong harmonic generation in three-level systems specified by a pair of nearly degenerate, strongly dipole-coupled excited states. Such systems are physically formed by the three lowest states in, e.g., the hydrogen atom or evenly charged homonuclear diatomic molecular ions under reasonably chosen laser intensities. As a detailed analytic result, we found that the laser pulse of photon energy 2.05eV, duration 0.23ps, and intensity 5x10{sup 13}(W/cm{sup 2}) is able to produce complete inversion of the initial population in the hydrogen atom through the five-photon excitation. At the same photon energy, the pulse of duration 0.41ps and intensity 3.44x10{sup 14}(W/cm{sup 2}) was found to produce the same effect in the molecular ion but through the nine-photon excitation. We show that the accompanying scattering of light has very rich spectrum differing substantially from that of the two-level system.

• OSTI ID: 21448568
• Journal Information: Physical Review. A, Vol. 82, Issue 2; Other Information: DOI: 10.1103/PhysRevA.82.023804; (c) 2010 The American Physical Society; ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ATOMS
DIPOLES
EXCITATION
EXCITED STATES
HARMONIC GENERATION
HYDROGEN
LASER RADIATION
MOLECULAR IONS
MULTI-PHOTON PROCESSES
PHOTONS
PULSES
RESONANCE
VISIBLE RADIATION
BOSONS
CHARGED PARTICLES
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
ELEMENTS
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
FREQUENCY MIXING
IONS
MASSLESS PARTICLES
MULTIPOLES
NONMETALS
RADIATIONS