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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 50, Iss. 26 — Sep. 10, 2011
  • pp: 5158–5162

Femtosecond laser electronic excitation tagging for quantitative velocity imaging in air

James B. Michael, Matthew R. Edwards, Arthur Dogariu, and Richard B. Miles  »View Author Affiliations


Applied Optics, Vol. 50, Issue 26, pp. 5158-5162 (2011)
http://dx.doi.org/10.1364/AO.50.005158


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Abstract

Time-accurate velocity measurements in unseeded air are made by tagging nitrogen with a femtosecond-duration laser pulse and monitoring the displacement of the molecules with a time-delayed, fast-gated camera. Centimeter-long lines are written through the focal region of a 1 mJ , 810 nm laser and are produced by nonlinear excitation and dissociation of nitrogen. Negligible heating is associated with this interaction. The emission arises from recombining nitrogen atoms and lasts for tens of microseconds in natural air. It falls into the 560 to 660 nm spectral region and consists of multiple spectral lines associated with first positive nitrogen transitions. The feasibility of this concept is demonstrated with lines written across a free jet, yielding instantaneous and averaged velocity profiles. The use of high-intensity femtosecond pulses for flow tagging allows the accurate determination of velocity profiles with a single laser system and camera.

© 2011 Optical Society of America

OCIS Codes
(120.0120) Instrumentation, measurement, and metrology : Instrumentation, measurement, and metrology
(120.7250) Instrumentation, measurement, and metrology : Velocimetry
(280.2490) Remote sensing and sensors : Flow diagnostics
(280.7060) Remote sensing and sensors : Turbulence
(280.7250) Remote sensing and sensors : Velocimetry

ToC Category:
Instrumentation, Measurement, and Metrology

History
Original Manuscript: April 28, 2011
Revised Manuscript: July 8, 2011
Manuscript Accepted: July 20, 2011
Published: September 9, 2011

Citation
James B. Michael, Matthew R. Edwards, Arthur Dogariu, and Richard B. Miles, "Femtosecond laser electronic excitation tagging for quantitative velocity imaging in air," Appl. Opt. 50, 5158-5162 (2011)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-50-26-5158


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