The Theoretical Study Of Multiphoton Ionization of Atom By Multiple Laser Beams

We have used interfering multiphoton ionization processes to measure changes in the relative phase between two optical laser beams. In this work, the phase variation is due to the \ensuremath{\pi} phase shift of a focused Gaussian beam as it propagates through the focal region. An array of linear collection electrodes is used to measure the multiphoton ionization rate as a function of the distance from the beam waist when two laser fields are resonant with an atomic transition, one through a linear process, the other through a three-photon process.We have used interfering multiphoton ionization processes to measure changes in the relative phase between two optical laser beams. In this work, the phase variation is due to the \ensuremath{\pi} phase shift of a focused Gaussian beam as it propagates through the focal region. An array of linear collection electrodes is used to measure the multiphoton ionization rate as a function of the distance from the beam waist when two laser fields are resonant with an atomic transition, one through a linear process, the other through a three-photon process.

Physical Review LettersOct 1, 1990174 citations

Recent Aspects of Multiphoton Ionization of Atoms

Pierre Agostini, E. Mével

NATO ASI series. Series B : PhysicsJan 1, 19940 citations

Resonant Multiphoton Ionization of a Cesium Atomic Beam by a Tunable-Wavelength Q -Switched Neodymium-Glass Laser

Bernard Held, G. Mainfray, C. Manus +2 more

The narrow spectral bandwith (0.4 \AA{}) of a Nd-glass laser was tuned over a range of 40 \AA{} to populate selectively the $6f$ level of cesium atoms. The resulting variation of the multiphoton ionization probability was investigated as a function of the laser wavelength.The narrow spectral bandwith (0.4 \AA{}) of a Nd-glass laser was tuned over a range of 40 \AA{} to populate selectively the $6f$ level of cesium atoms. The resulting variation of the multiphoton ionization probability was investigated as a function of the laser wavelength.

Physical Review LettersMar 5, 197364 citations

Multiphoton Ionization of Atoms (REVIEW)

Didier Normand, Jürgen Reif, J. Morellec

Jan 1, 19840 citations

Two-colour intensity suppression of multiphoton ionization of atomic deuterium

Paul David Bowe, R W O'Neill, Peter J. M. van der Burgt +4 more

We report a strong suppression of the three-photon ionization resonant with the 2s state of atomic deuterium at 243 nm by the introduction of a second colour (486 nm) coupling the 2s and 4p states. This coupling reduces the ionization probability by several orders of magnitude. The experiment is performed using fundamental and second harmonic frequencies of the same laser, with laser intensities up to a maximum value of and an atomic target density of the order of . The production of both ions and D(2s) atoms is measured as a function of the intensity of the fundamental beam (486 nm). The experimental data are compared with a theoretical calculation using essential states and taking into account the experimental laser bandwidths.We report a strong suppression of the three-photon ionization resonant with the 2s state of atomic deuterium at 243 nm by the introduction of a second colour (486 nm) coupling the 2s and 4p states. This coupling reduces the ionization probability by several orders of magnitude. The experiment is performed using fundamental and second harmonic frequencies of the same laser, with laser intensities up to a maximum value of and an atomic target density of the order of . The production of both ions and D(2s) atoms is measured as a function of the intensity of the fundamental beam (486 nm). The experimental data are compared with a theoretical calculation using essential states and taking into account the experimental laser bandwidths.

Journal of Physics B Atomic Molecular and Optical PhysicsMar 14, 19984 citations

The narrow spectral bandwith (0.4 \AA{}) of a Nd-glass laser was tuned over a range of 40 \AA{} to populate selectively the

6f

level of cesium atoms. The resulting variation of the multiphoton ionization probability was investigated as a function of the laser wavelength.