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Experimental study of mid-IR laser beam wander close to a jet engine exhaust
KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics. Dept. of Laser Systems, Swedish Defence Research Agency, FOI, Sweden.
2006 (English)In: Proceedings of SPIE, the International Society for Optical Engineering, ISSN 0277-786X, E-ISSN 1996-756X, Vol. 6397Article in journal (Refereed) Published
Abstract [en]

An increasing interest in lasers placed on aircrafts for active countermeasures and active imaging is observed. There remain unsolved issues regarding the propagation effects close to the jet engine exhaust and the possibilities of compensating them with adaptive optics. Laser beam propagation experiments parallel to the exhaust of a downscaled jet engine test rig have been performed. The experiments were carried out with nanosecond laser pulses at 1.6 and 3.5 μm wavelength. The laser spots were projected on a screen and the centroid motion were imaged by cameras. Root mean square magnitudes of the beam wander between 50 and 150 μrad were observed for different engine conditions and geometries. The 3.5 μm system had a frame rate of 607 Hz and could partly resolve the time variation of the beam wander. A correlation time (50 %) of 3.5 ms was observed for the beam wander. Deflections of several hundred μrad due to the average gradients in temperature and pressure were also found when the engine was turned on. In addition to beam wander intensity scintillations has been studied.

Place, publisher, year, edition, pages
2006. Vol. 6397
Keyword [en]
Beam wander, Countermeasure, Jet engine, Laser, Adaptive optics, Jet engines, Laser beams, Scintillation, Thermal gradients, Beam wanders, Engine conditions, Laser beam propagation, Exhaust systems (engine)
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:kth:diva-155863DOI: 10.1117/12.689638ISI: 000243915500008Scopus ID: 2-s2.0-33846316399ISBN: 0819464953 (print)ISBN: 9780819464958 (print)OAI: oai:DiVA.org:kth-155863DiVA: diva2:764245
Conference
Conference on Technologies for Optical Countermeasures III, Sweden, 2006
Note

QC 20141118

Available from: 2014-11-18 Created: 2014-11-13 Last updated: 2017-12-05Bibliographically approved

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CiteExportLink to record
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  • apa
  • harvard1
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Output format
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