National Technical Reports Library

The National Technical Information Service acquires, indexes, abstracts, and archives the largest collection of U.S. government-sponsored technical reports in existence. The NTRL offers online, free and open access to these authenticated government technical reports. Technical reports and documents in its repository may be available online for free either from the issuing federal agency, the U.S. Government Publishing Office’s Federal Digital System website, or through search engines.

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DE2005833826

Publication Date	2001
Page Count	18
Abstract	Our research efforts over the last few years have focused on the development of strategies for the quantitative application of DFWM and PS in flame environments. We have developed, validated, and applied a theoretical methodology based on direct numerical integration (DNI) of the time-dependent density matrix equations for analysis of the physics of the DFWM and PS processes. The incorporation of the Zeeman state structure of the energy levels of the radiative transitions has allowed us to investigate the physics of the PS process and polarization effects in DFWM. Our research effort has focused mainly on the moderate saturation regime, with laser pulse lengths significantly greater than characteristic collisional times, and with the assumption of monochromatic lasers. Recently, we have completed a study of multi-axial-mode laser effects of homogeneously broadened PS.
Keywords	Quantitative chemical analysis Spectroscopy Zeeman effect Density matrix Energy levels Lasers Polarization Saturation Flames Four wave mixing
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Department of Energy, Chicago, IL. Chicago Operations Office.
Document Type	Technical Report
NTIS Issue Number	200519

Final Report: Investigation of Saturated Degenerate Four-Wave Mixing Spectroscopy for Quantitative Concentration Measurements.

Final Report: Investigation of Saturated Degenerate Four-Wave Mixing Spectroscopy for Quantitative Concentration Measurements.
DE2005833826

Publication Date	2001
Page Count	18
Abstract	Our research efforts over the last few years have focused on the development of strategies for the quantitative application of DFWM and PS in flame environments. We have developed, validated, and applied a theoretical methodology based on direct numerical integration (DNI) of the time-dependent density matrix equations for analysis of the physics of the DFWM and PS processes. The incorporation of the Zeeman state structure of the energy levels of the radiative transitions has allowed us to investigate the physics of the PS process and polarization effects in DFWM. Our research effort has focused mainly on the moderate saturation regime, with laser pulse lengths significantly greater than characteristic collisional times, and with the assumption of monochromatic lasers. Recently, we have completed a study of multi-axial-mode laser effects of homogeneously broadened PS.
Keywords	Quantitative chemical analysis Spectroscopy Zeeman effect Density matrix Energy levels Lasers Polarization Saturation Flames Four wave mixing
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Department of Energy, Chicago, IL. Chicago Operations Office.
Document Type	Technical Report
NTIS Issue Number	200519