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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 45, Iss. 13 — May. 1, 2006
  • pp: 3038–3048

Detection and tracking of the backreflection of potassium dihydrogen phosphate images in the presence or absence of a phase mask

Abdul A. S. Awwal, Wilbert A. McClay, Walter S. Ferguson, James V. Candy, Thad Salmon, and Paul Wegner  »View Author Affiliations


Applied Optics, Vol. 45, Issue 13, pp. 3038-3048 (2006)
http://dx.doi.org/10.1364/AO.45.003038


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Abstract

The potassium dihydrogen phosphate (KDP) crystals present in the final optics assembly at the National Ignition Facility (NIF) are used for conversion of an infrared laser light beam into an ultraviolet beam. The conversion is highest for a certain incident angle, the alignment of which is determined from the position of the backreflection beam, which exhibits a distinct characteristic shape. When a phase-plate device is introduced before the final assembly to increase the uniformity of the beam, the backreflection pattern changes drastically. The algorithm that is best for tracking the special-shaped beam is no longer suitable for tracking the phase-modified beam. We discuss our detection schemes for both situations. In particular, we demonstrate how the algorithm senses the modified beam by using a newly proposed criterion of correlation peak pedestal area and executes an alternate algorithm in real time without operator intervention. This new algorithm continuously tracks the beam pattern to guarantee reliable and repeatable sensing. Results from simulation and real-world implementation of the algorithm at the NIF facility are presented.

© 2006 Optical Society of America

OCIS Codes
(000.5490) General : Probability theory, stochastic processes, and statistics
(070.5010) Fourier optics and signal processing : Pattern recognition
(100.5010) Image processing : Pattern recognition
(100.5090) Image processing : Phase-only filters
(120.1880) Instrumentation, measurement, and metrology : Detection
(190.2620) Nonlinear optics : Harmonic generation and mixing

ToC Category:
Application

History
Original Manuscript: June 28, 2005
Revised Manuscript: October 21, 2005
Manuscript Accepted: October 25, 2005

Citation
Abdul A. S. Awwal, Wilbert A. McClay, Walter S. Ferguson, James V. Candy, Thad Salmon, and Paul Wegner, "Detection and tracking of the backreflection of potassium dihydrogen phosphate images in the presence or absence of a phase mask," Appl. Opt. 45, 3038-3048 (2006)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-45-13-3038


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References

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