Low-threshold bidirectional air lasing

Alexandre Laurain, Maik Scheller, Pavel Polynkin

Research output: Contribution to journalArticlepeer-review

80 Scopus citations


Air lasing refers to the remote optical pumping of the constituents of ambient air that results in a directional laserlike emission from the pumped region. Intense current investigations of this concept are motivated by the potential applications in remote atmospheric sensing. Different approaches to air lasing are being investigated, but, so far, only the approach based on dissociation and resonant two-photon pumping of air molecules by deep-UV laser pulses has produced measurable lasing energies in real air and in the backward direction, which is of the most relevance for applications. However, the emission had a high pumping threshold, in hundreds of GW/cm2. We demonstrate that the threshold can be virtually eliminated through predissociation of air molecules with an additional nanosecond laser. We use a single tunable pump laser system to generate backward-propagating lasing in both oxygen and nitrogen in air, with energies of up to 1μJ per pulse.

Original languageEnglish (US)
Article number253901
JournalPhysical review letters
Issue number25
StatePublished - Dec 17 2014

ASJC Scopus subject areas

  • General Physics and Astronomy


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