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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 46, Iss. 22 — Aug. 1, 2007
  • pp: 5216–5227

Photodeflection signal formation in photothermal measurements: comparison of the complex ray theory, the ray theory, the wave theory, and experimental results

Dorota Korte Kobylińska, Roman J. Bukowski, Bogusław Burak, Jerzy Bodzenta, and Stanisław Kochowski  »View Author Affiliations


Applied Optics, Vol. 46, Issue 22, pp. 5216-5227 (2007)
http://dx.doi.org/10.1364/AO.46.005216


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Abstract

A comparison is made of three methods for modeling the interaction of a laser probe beam with the temperature field of a thermal wave. The three methods include: (1) a new method based on complex ray theory, which allows us to take into account the disturbance of the amplitude and phase of the electric field of the probe beam, (2) the ray deflection averaging theory of Aamodt and Murphy, and (3) the wave theory (WT) of Glazov and Muratikov. To carry out this comparison, it is necessary to reformulate the description of the photodeflection signal in either the WT or the ray deflection averaging theory. It is shown that the differences between calculated signals using the different theories are most pronounced when the radius of the probe beam is comparable with the length of the thermal wave in the region of their interaction. Predictions of the theories are compared with experimental results. A few parameters of the experimental setup are determined through multiparameter fitting of the theoretical curves to the experimental data. A least-squares procedure was chosen as a fitting method. The conclusion is that the calculation of the photodeflection signal in the framework of the complex ray theory is a more accurate approach than the ray deflection averaging theory or the wave one.

© 2007 Optical Society of America

OCIS Codes
(080.0080) Geometric optics : Geometric optics
(080.2710) Geometric optics : Inhomogeneous optical media
(080.2720) Geometric optics : Mathematical methods (general)
(120.0120) Instrumentation, measurement, and metrology : Instrumentation, measurement, and metrology
(120.4290) Instrumentation, measurement, and metrology : Nondestructive testing

ToC Category:
Geometrical optics

History
Original Manuscript: December 1, 2006
Revised Manuscript: April 13, 2007
Manuscript Accepted: April 14, 2007
Published: July 9, 2007

Citation
Dorota Korte Kobylińska, Roman J. Bukowski, Boguslaw Burak, Jerzy Bodzenta, and Stanislaw Kochowski, "Photodeflection signal formation in photothermal measurements: comparison of the complex ray theory, the ray theory, the wave theory, and experimental results," Appl. Opt. 46, 5216-5227 (2007)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-46-22-5216

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