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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 42, Iss. 21 — Jul. 20, 2003
  • pp: 4307–4314

Fiber-optic delivery of high-peak-power Q-switched laser pulses for in-cylinder flow measurement

Timothy J. Stephens, Martin J. Haste, David P. Towers, Martin J. Thomson, Mohammed R. Taghizadeh, Julian D. C. Jones, and Duncan P. Hand  »View Author Affiliations


Applied Optics, Vol. 42, Issue 21, pp. 4307-4314 (2003)
http://dx.doi.org/10.1364/AO.42.004307


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Abstract

A bundle of optical fibers was constructed to deliver Q-switched frequency-doubled Nd:YAG laser pulses for the purpose of particle image velocimetry. Data loss that is due to fiber speckle was reduced by ensuring that each fiber was different in length by more than the coherence length of the laser being delivered. Hence, their speckle patterns will overlap but not interfere, producing more even illumination that is shown to reduce data loss. A custom-made diffractive optical element and careful endface preparation help to reduce damage to the fibers by the required high peak powers. With this method, pulse energies in excess of 25 mJ were delivered for a series of experimental trials within the cylinder head of an optically accessed internal combustion engine. Results from these trials are presented along with a comparison of measurements generated by conventionally delivered beams.

© 2003 Optical Society of America

OCIS Codes
(120.4820) Instrumentation, measurement, and metrology : Optical systems
(280.7250) Remote sensing and sensors : Velocimetry
(350.1820) Other areas of optics : Damage

History
Original Manuscript: September 27, 2002
Revised Manuscript: March 24, 2003
Published: July 20, 2003

Citation
Timothy J. Stephens, Martin J. Haste, David P. Towers, Martin J. Thomson, Mohammed R. Taghizadeh, Julian D. C. Jones, and Duncan P. Hand, "Fiber-optic delivery of high-peak-power Q-switched laser pulses for in-cylinder flow measurement," Appl. Opt. 42, 4307-4314 (2003)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-42-21-4307

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