Abstract
As for light diffraction by fixed gratings, one can distinguish between the Fraunhofer region (farfield) and the Fresnel region (nearfield) of the diffracted light. Whereas the individual farfield diffraction orders have constant light intensity, at least if the ultrasonic wave is a progressive one, the intensity in the nearfield of the diffracted light is modulated in both time and space. This intensity modulation is due to the mutual interferences of the various diffracted light waves and may be very complex, even for moderate ultrasonic amplitudes. Moreover, the intensity distribution in the nearfield of the diffracted light appears to be much more sensitive to variations of the ultrasonic power than the individual Fraunhofer intensities, which provides a useful technique for observing weak ultrasonic waves. In addition, the intensity measurement in the nearfield requires a simple experimental arrangement.
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References
E. Blomme, “Theoretical study of light diffraction by one or more ultrasonic waves in the MHz-region”, Doctoral Thesis, K.U.L. Leuven (1987).
E. Blomme and O. Leroy, On the nearfield of light diffracted by a plane periodic ultrasonic wave, Proc. 4th Spring School on Acousto-Optics, 47–68, Gdansk 1989, Ed. A. Sliwinski, University of Gdansk.
O. Leroy, Theory of the diffraction of light by ultrasonic waves consisting of a fundamental tone and its first n-1 harmonics, Ultrasonics, 10: 182–186 (1972).
H. Colbert and K. Zankel, Light diffraction by ultrasonic waves - Fresnel region, J. Acoust. Soc. Am. 35: 359–363 (1963).
P. Kwiek and A. Markiewicz, Investigation of the nearfield of light in the diffraction system consisting of two ultrasonic beams, Proc. 4th Spring School on Acousto-optics, 129–151, Gdansk 1989, Ed. A. Sliwinski, University of Gdansk.
K. Van Den Abeele and O. Leroy, Optical measurement of plane superposed ultrasonic waves, Proc. 4th Spring School on Acousto-Optics, 291–300, Gdansk 1989, Ed. A. Sliwinski, University of Gdansk.
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© 1991 Plenum Press, New York
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Blomme, E., Briers, R., Leroy, O. (1991). Analysis of the Nearfield of Laser Light Diffracted by a Plane Ultrasonic Wave. In: Leroy, O., Breazeale, M.A. (eds) Physical Acoustics. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-9573-1_26
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DOI: https://doi.org/10.1007/978-1-4615-9573-1_26
Publisher Name: Springer, Boston, MA
Print ISBN: 978-1-4615-9575-5
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