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Title: Optical field ionization of atoms and ions using ultrashort laser pulses

Abstract

This dissertation research is an investigation of the strong optical field ionization of atoms and ions by 120-fs, 614-run laser pulses and 130-fs, 800-nm laser pulses. The experiments have shown ionization that is enhanced above the predictions of sequential tunneling models for He +2, Ne +2 and Ar +2. The ion yields for He +1, Ne +1 and Ar +1 agree well with the theoretical predictions of optical tunneling models. Investigation of the polarization dependence of the ionization indicates that the enhancements are consistent with a nonsequential ionization mechanism in which the linearly polarized field drives the electron wavefunction back toward the ion core and causes double ionization through inelastic e-2e scattering. These investigations have initiated a number of other studies by other groups and are of current scientific interest in the fields of high-irradiance laser-matter interactions and production of high-density plasmas. This work involved: (1) Understanding the characteristic nature of the ion yields produced by tunneling ionization through investigation of analytic solutions for tunneling at optical frequencies. (2) Extensive characterization of the pulses produced by 614-nm and 800-ran ultrashort pulse lasers. Absolute calibration of the irradiance scale produced shows the practicality of the inverse problem--measuring peak laser irradiance usingmore » ion yields. (3) Measuring the ion yields for three noble gases using linear, circular and elliptical polarizations of laser pulses at 614-nm and 800-nm. The measurements are some of the first measurements for pulse widths as low as 120-fs.« less

Authors:
 [1]
  1. Univ. of California, Davis, CA (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab., CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
10123111
Report Number(s):
UCRL-LR-115496
ON: DE94006643
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Thesis/Dissertation
Resource Relation:
Other Information: TH: Thesis (Ph.D.); PBD: Dec 1993
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; HELIUM IONS; PHOTOIONIZATION; NEON IONS; ARGON IONS; LASER RADIATION; TUNNEL EFFECT; ULTRAVIOLET RADIATION; MULTI-PHOTON PROCESSES; LASER-PRODUCED PLASMA; EXPERIMENTAL DATA; 664400; EXPERIMENTALLY DERIVED INFORMATION ON ATOMIC AND MOLECULAR PROPERTIES

Citation Formats

Fittinghoff, David Neal. Optical field ionization of atoms and ions using ultrashort laser pulses. United States: N. p., 1993. Web. doi:10.2172/10123111.
Fittinghoff, David Neal. Optical field ionization of atoms and ions using ultrashort laser pulses. United States. https://doi.org/10.2172/10123111
Fittinghoff, David Neal. Wed . "Optical field ionization of atoms and ions using ultrashort laser pulses". United States. https://doi.org/10.2172/10123111. https://www.osti.gov/servlets/purl/10123111.
@article{osti_10123111,
title = {Optical field ionization of atoms and ions using ultrashort laser pulses},
author = {Fittinghoff, David Neal},
abstractNote = {This dissertation research is an investigation of the strong optical field ionization of atoms and ions by 120-fs, 614-run laser pulses and 130-fs, 800-nm laser pulses. The experiments have shown ionization that is enhanced above the predictions of sequential tunneling models for He+2, Ne+2 and Ar+2. The ion yields for He+1, Ne+1 and Ar+1 agree well with the theoretical predictions of optical tunneling models. Investigation of the polarization dependence of the ionization indicates that the enhancements are consistent with a nonsequential ionization mechanism in which the linearly polarized field drives the electron wavefunction back toward the ion core and causes double ionization through inelastic e-2e scattering. These investigations have initiated a number of other studies by other groups and are of current scientific interest in the fields of high-irradiance laser-matter interactions and production of high-density plasmas. This work involved: (1) Understanding the characteristic nature of the ion yields produced by tunneling ionization through investigation of analytic solutions for tunneling at optical frequencies. (2) Extensive characterization of the pulses produced by 614-nm and 800-ran ultrashort pulse lasers. Absolute calibration of the irradiance scale produced shows the practicality of the inverse problem--measuring peak laser irradiance using ion yields. (3) Measuring the ion yields for three noble gases using linear, circular and elliptical polarizations of laser pulses at 614-nm and 800-nm. The measurements are some of the first measurements for pulse widths as low as 120-fs.},
doi = {10.2172/10123111},
url = {https://www.osti.gov/biblio/10123111}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1993},
month = {12}
}

Thesis/Dissertation:
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