Raman conversion in intense femtosecond Bessel beams in air

Maik Scheller; Xi Chen; Gombojav O. Ariunbold; Norman Born; Jerome Moloney; Miroslav Kolesik; Pavel Polynkin

doi:10.1103/PhysRevA.89.053805

Raman conversion in intense femtosecond Bessel beams in air

Maik Scheller, Xi Chen, Gombojav O. Ariunbold, Norman Born, Jerome Moloney, Miroslav Kolesik, Pavel Polynkin

Optical Sciences, College of

Research output: Contribution to journal › Article › peer-review

2 Scopus citations

Abstract

We demonstrate experimentally that bright and nearly collimated radiation can be efficiently generated in air pumped by an intense femtosecond Bessel beam. We show that this nonlinear conversion process is driven by the rotational Raman response of air molecules. Under optimum conditions, the conversion efficiency from the Bessel pump into the on-axis propagating beam exceeds 15% and is limited by the onset of intensity clamping and plasma refraction on the beam axis. Our experimental findings are in excellent agreement with numerical simulations based on the standard model for the ultrafast nonlinear response of air.

Original language	English (US)
Article number	053805
Journal	Physical Review A - Atomic, Molecular, and Optical Physics
Volume	89
Issue number	5
DOIs	https://doi.org/10.1103/PhysRevA.89.053805
State	Published - May 5 2014

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics

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AU - Scheller, Maik

AU - Chen, Xi

AU - Ariunbold, Gombojav O.

AU - Born, Norman

AU - Moloney, Jerome

AU - Kolesik, Miroslav

AU - Polynkin, Pavel

PY - 2014/5/5

Y1 - 2014/5/5

N2 - We demonstrate experimentally that bright and nearly collimated radiation can be efficiently generated in air pumped by an intense femtosecond Bessel beam. We show that this nonlinear conversion process is driven by the rotational Raman response of air molecules. Under optimum conditions, the conversion efficiency from the Bessel pump into the on-axis propagating beam exceeds 15% and is limited by the onset of intensity clamping and plasma refraction on the beam axis. Our experimental findings are in excellent agreement with numerical simulations based on the standard model for the ultrafast nonlinear response of air.

AB - We demonstrate experimentally that bright and nearly collimated radiation can be efficiently generated in air pumped by an intense femtosecond Bessel beam. We show that this nonlinear conversion process is driven by the rotational Raman response of air molecules. Under optimum conditions, the conversion efficiency from the Bessel pump into the on-axis propagating beam exceeds 15% and is limited by the onset of intensity clamping and plasma refraction on the beam axis. Our experimental findings are in excellent agreement with numerical simulations based on the standard model for the ultrafast nonlinear response of air.

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