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Increased inversion efficiency in optically pumped two-level molecular systems.

J S Goela1, T F Morse

  • 1Physical Sciences Inc., Woburn, Massachusetts 01801, USA.

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|August 19, 2009
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Optically pumping molecular gases can excite over half the particles into higher vibrational states. This technique enhances gain in specific transitions and fluorescence signals for laser-induced fluorescence experiments.

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Area of Science:

  • Molecular Spectroscopy
  • Quantum Optics
  • Laser Physics

Background:

  • Optical pumping is a key technique for manipulating molecular energy levels.
  • Understanding population distributions in molecular gases is crucial for laser applications.
  • High J number transitions in molecular gases are complex to analyze.

Purpose of the Study:

  • To investigate the effects of optical pumping on molecular vibrational populations.
  • To explore the potential for enhanced gain and fluorescence signals.
  • To demonstrate wavelength shifting capabilities using specific pumping schemes.

Main Methods:

  • High J number R-branch optical pumping of molecular gases.
  • Analysis of population distribution in excited vibrational manifolds.
  • Measurement of gain in intermediate-lying states.
  • Laser-induced fluorescence (LIF) measurements.
  • Investigation of pumping in band transitions with frequencies lower than the pump laser.

Main Results:

  • Achieved over 50% population in the excited vibrational manifold under specific optical pumping conditions.
  • Observed increased gain on transitions to intermediate-lying states.
  • Demonstrated enhanced fluorescence signal in laser-induced fluorescence experiments.
  • Obtained gain on pumping band transitions with frequencies lower than the pump laser frequency.
  • Showcased the potential for wavelength shifting through this method.

Conclusions:

  • Optical pumping of high J number R-branch transitions is an effective method to significantly populate excited vibrational states.
  • This population inversion leads to enhanced optical gain and fluorescence, beneficial for laser applications and diagnostics.
  • The technique offers a novel approach for achieving wavelength shifts in molecular systems.