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Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing

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Published on: March 22, 2019

Recombination-pumped triatomic hydrogen infrared lasers.

R J Saykally¹, E A Michael, J Wang

¹Department of Chemistry, University of California, Berkeley, California 94720-1460, USA.

The Journal of Chemical Physics

|December 29, 2010

Summary

This summary is machine-generated.

Mid-infrared laser lines in hydrogen/rare gas discharges originate from three-body recombination. This involves electrons, rare gas atoms, and triatomic hydrogen ions (H3+), suggesting new molecular recombination laser possibilities.

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Area of Science:

Atomic and Molecular Physics
Plasma Physics
Laser Science

Background:

Observation of mid-infrared laser lines in hydrogen/rare gas discharges.
Previous studies on hydrogenic/rare gas afterglow plasmas.

Purpose of the Study:

Assign observed mid-infrared laser lines to specific physical processes.
Investigate the mechanism behind population inversion in these systems.
Explore potential applications and implications of molecular recombination lasers.

Main Methods:

Theoretical calculations of radiative transitions between neutral H3 Rydberg states.
Analysis of three-body recombination processes involving electrons, rare gas atoms (He, Ne), and triatomic hydrogen ions (H3+).

Main Results:

Assignment of mid-infrared laser lines to electron-rare gas-H3+ three-body recombination.
Support for the interpretation through calculations of radiative transitions.
Connection established with findings from hydrogenic/rare gas afterglow plasmas.

Conclusions:

Proposed mechanism for population inversion in molecular recombination lasers.
Discussion of the potential generality and astrophysical significance of these laser systems.