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Applied Optics

Applied Optics


  • Vol. 43, Iss. 26 — Sep. 10, 2004
  • pp: 5064–5073

Narrow-linewidth megahertz-rate pulse-burst laser for high-speed flow diagnostics

Brian Thurow, Naibo Jiang, Mo Samimy, and Walter Lempert  »View Author Affiliations

Applied Optics, Vol. 43, Issue 26, pp. 5064-5073 (2004)

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A second-generation pulse-burst laser system for high-speed flow diagnostics is described in detail. The laser can produce a burst of high-energy pulses (of the order of hundreds of millijoules per pulse) with individual pulse durations of less than 10 ns and pulse separations as short as 1 μs. A key improvement is the addition of a phase-conjugate mirror, which effectively isolates the high-intensity, short-duration pulses from the low-intensity, long-duration background illumination. It allows for more-efficient amplification and harmonic generation, with efficiencies exceeding 50% for second-harmonic and 40% for third-harmonic generation. Characteristics of the laser system, including gain narrowing, pulse-burst energy distribution, pulse narrowing, and overall pulse-burst energy, are described. In addition, the applicability of the laser for spectroscopic-based flow diagnostics is demonstrated through the presentation of megahertz-rate planar Doppler velocimetry results.

© 2004 Optical Society of America

OCIS Codes
(120.7250) Instrumentation, measurement, and metrology : Velocimetry
(140.3530) Lasers and laser optics : Lasers, neodymium
(140.3540) Lasers and laser optics : Lasers, Q-switched
(190.5040) Nonlinear optics : Phase conjugation
(290.5900) Scattering : Scattering, stimulated Brillouin
(300.6500) Spectroscopy : Spectroscopy, time-resolved

Original Manuscript: March 22, 2004
Revised Manuscript: June 14, 2004
Published: September 10, 2004

Brian Thurow, Naibo Jiang, Mo Samimy, and Walter Lempert, "Narrow-linewidth megahertz-rate pulse-burst laser for high-speed flow diagnostics," Appl. Opt. 43, 5064-5073 (2004)

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