Accession Number:

ADA238231

Title:

Laser-Atom Interaction at High Intensities

Descriptive Note:

Final rept. 1 Jan 88-31 Dec 90,

Corporate Author:

MARYLAND UNIV COLLEGE PARK INST FOR PHYSICAL SCIENCE AND TECHNOLOGY

Personal Author(s):

Report Date:

1991-05-20

Pagination or Media Count:

7.0

Abstract:

A general program has been developed to calculate multiphoton processes in atomic hydrogen to arbitrarily high order in perturbation theory. This program can be used to calculate quantities in intense field multiphoton processes, such as the generalized cross section of multiphoton absorption, the a.c. Stark effect shift and the broadening of the level due to the field interaction, and the parameters in nonlinear optics such as the nonlinear index of refraction and the nonlinear susceptibility. Effective parametrization of high-order susceptibilities has been achieved over a wide range of frequencies, utilizing concepts from quantum defect theory to express the results of lengthy calculations in a compact form that also permits extrapolation across thresholds and resonance poles. Significant progress has been made in direct numerical solution of the time-dependent Schroedinger equation. In addition, contributions have been made in understanding the role of spatial dimensionality in the solution of model systems e.G., the one-dimensional delta-function potential the development of a general R-matrix code for perturbative computations of multiphoton processes in many-electron atoms and multiphoton ionization with two commensurate laser frequencies.

Subject Categories:

  • Atomic and Molecular Physics and Spectroscopy
  • Quantum Theory and Relativity

Distribution Statement:

APPROVED FOR PUBLIC RELEASE