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Title: Determination of Optical-Field Ionization Dynamics in Plasmas through the Direct Measurement of the Optical Phase Change

Abstract

This is the final report of a three-year Laboratory Directed Research and Development (LDRD) Project at Los Alamos National Laboratory (LANL). The detailed dynamics of an atom in a strong laser field is rich in both interesting physics and potential applications. The goal of this project was to develop a technique for characterizing high-field laser-plasma interactions with femtosecond resolution based on the direct measurement of the phase change of an optical pulse. The authors developed the technique of Multi-pulse Interferometric Frequency Resolved Optical Gating (MI-FROG), which recovers (to all orders) the phase difference between pumped and unpumped probe pulses, enabling the determination of sub-pulsewidth time-resolved phase and frequency shifts impressed by a pump pulse on a weak probe pulse. Using MI-FROG, the authors obtained the first quantitative measurements of high-field ionization rates in noble gases and diatomic molecules. They obtained agreement between the measured ionization rates an d those calculated for the noble gases and diatomic nitrogen and hydrogen using a one-dimensional fluid model and rates derived from tunneling theory. However, much higher rates are measured for diatomic oxygen than predicted by tunneling theory calculations.

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
Los Alamos National Lab., NM (US)
Sponsoring Org.:
US Department of Energy (US)
OSTI Identifier:
759189
Report Number(s):
LA-UR-99-3036
TRN: US0004318
DOE Contract Number:  
W-7405-ENG-36
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 16 Jul 1999
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ATOMS; DYNAMICS; FLUIDS; HYDROGEN; INTERACTIONS; IONIZATION; LASERS; MOLECULES; NITROGEN; OXYGEN; PROBES; RARE GASES; RESOLUTION; TUNNELING; PHASE TRANSFORMATIONS

Citation Formats

Taylor, A.J., Omenetto, G., Rodriguez, G., Siders, C.W., Siders, J.L.W., and Downer, C. Determination of Optical-Field Ionization Dynamics in Plasmas through the Direct Measurement of the Optical Phase Change. United States: N. p., 1999. Web. doi:10.2172/759189.
Taylor, A.J., Omenetto, G., Rodriguez, G., Siders, C.W., Siders, J.L.W., & Downer, C. Determination of Optical-Field Ionization Dynamics in Plasmas through the Direct Measurement of the Optical Phase Change. United States. doi:10.2172/759189.
Taylor, A.J., Omenetto, G., Rodriguez, G., Siders, C.W., Siders, J.L.W., and Downer, C. Fri . "Determination of Optical-Field Ionization Dynamics in Plasmas through the Direct Measurement of the Optical Phase Change". United States. doi:10.2172/759189. https://www.osti.gov/servlets/purl/759189.
@article{osti_759189,
title = {Determination of Optical-Field Ionization Dynamics in Plasmas through the Direct Measurement of the Optical Phase Change},
author = {Taylor, A.J. and Omenetto, G. and Rodriguez, G. and Siders, C.W. and Siders, J.L.W. and Downer, C.},
abstractNote = {This is the final report of a three-year Laboratory Directed Research and Development (LDRD) Project at Los Alamos National Laboratory (LANL). The detailed dynamics of an atom in a strong laser field is rich in both interesting physics and potential applications. The goal of this project was to develop a technique for characterizing high-field laser-plasma interactions with femtosecond resolution based on the direct measurement of the phase change of an optical pulse. The authors developed the technique of Multi-pulse Interferometric Frequency Resolved Optical Gating (MI-FROG), which recovers (to all orders) the phase difference between pumped and unpumped probe pulses, enabling the determination of sub-pulsewidth time-resolved phase and frequency shifts impressed by a pump pulse on a weak probe pulse. Using MI-FROG, the authors obtained the first quantitative measurements of high-field ionization rates in noble gases and diatomic molecules. They obtained agreement between the measured ionization rates an d those calculated for the noble gases and diatomic nitrogen and hydrogen using a one-dimensional fluid model and rates derived from tunneling theory. However, much higher rates are measured for diatomic oxygen than predicted by tunneling theory calculations.},
doi = {10.2172/759189},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1999},
month = {7}
}