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Low-threshold bidirectional air lasing.

Alexandre Laurain1, Maik Scheller1, Pavel Polynkin1

  • 1College of Optical Sciences, University of Arizona, 1630 East University Boulevard, Tucson, Arizona 85721, USA.

Physical Review Letters
|January 3, 2015
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Summary
This summary is machine-generated.

Researchers have virtually eliminated the high threshold for air lasing, a technique for remote atmospheric sensing. This breakthrough enables backward-propagating laser emission in air using a single tunable laser system.

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Area of Science:

  • Physics
  • Atmospheric Science
  • Laser Science

Background:

  • Air lasing involves remote optical pumping of air to create laserlike emission.
  • Current research focuses on applications in remote atmospheric sensing.
  • Previous methods required high pumping thresholds (hundreds of GW/cm²).

Purpose of the Study:

  • To demonstrate a method for significantly reducing the pumping threshold for air lasing.
  • To achieve backward-propagating lasing in ambient air.
  • To investigate the potential for remote atmospheric sensing applications.

Main Methods:

  • Utilizing predissociation of air molecules with a nanosecond laser to lower the pumping threshold.
  • Employing a single tunable pump laser system.
  • Generating backward-propagating lasing in oxygen and nitrogen within ambient air.

Main Results:

  • The pumping threshold for air lasing was virtually eliminated.
  • Backward-propagating lasing was achieved in both oxygen and nitrogen.
  • Lasing energies of up to 1 μJ per pulse were recorded.

Conclusions:

  • Predissociation effectively reduces the threshold for air lasing.
  • This technique advances the feasibility of air lasing for remote sensing.
  • The development paves the way for practical applications in atmospheric monitoring.