Abstract
The objective of this study is to identify the frequency response of narrowband surface waves generated by a laser beam that has been spatially modulated with a line-arrayed slit mask. For theoretical analysis, the frequency response of the generated surface wave was modeled assuming that the energy distribution of each line beam was Gaussian. The variation in the frequency response according to slit opening width was predicted. However, experimental results generated by masking an expanded laser beam with line-arrayed slits were different from the theoretical predictions for wide slit openings. In this paper, we suggest a new model that assumes the energy distribution of each line beam to be uniform, which is a reasonable assumption when the slit mask is close to the surface of the specimen. The frequency response predicted by using this model showed good agreement with the experimental results over the entire range of slit opening ratios, which indicates that our uniform model is suitable for analyzing the frequency responses of narrowband surface waves generated by laser beams that have been spatially modulated with a line-arrayed slit mask.
Similar content being viewed by others
References
C. B. Scruby and L. E. Drain, Laser Ultrasonics: Techniques and Applications (Adam Hilger, Bristol, 1990).
D. Royer and E. Dieulesaint, J. Appl. Phys. 56, 2057 (1984).
E. A. Ash, E. Dieulesaint and H. Rakouth, Electron. Lett. 16, 470 (1980).
A. D. W. McKie, J. W. Wagner, J. B. Spicer and C. M. Penny, Ultrasonics 27, 323 (1989).
J. Huang, S. Krishnaswamy and J. D. Achenbach, J. Acoust. Soc. Am. 92, 2527 (1992).
T. W. Murray, J. B. Deaton and J. W. Wagner, Ultrasonics 34, 69 (1996).
A. Harata, N. Nishimura and T. Sawada, Appl. Phys. Lett. 57, 132 (1990).
H. Nishino, Y. Tsukahara, Y. Nagata, T. Koda and K. Yamanaka, Appl. Phys. Lett. 62, 2036 (1993).
H. Nakano and S. Nagai, Ultrasonics 29, 230 (1991).
K. A. Nelson, R. J. D. Miller, D. R. Lutz and M. D. Fayer, J. Appl. Phys. 53, 1144 (1982).
T. H. Nam, S. H. Choi, T. H. Lee, K. Y. Jhang and C. S. Kim, J. Korean Phys. Soc. 57, 1212 (2010).
C. E. Duffer and C. P. Burger, Rev. Prog. QNDE 15, 593 (1996).
Y. H. Berthelot and J. Jarzynski, Rev. Prog. QNDE 9, 463 (1990).
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Choi, S., Nam, T., Jhang, KY. et al. Frequency response of narrowband surface waves generated by laser beams spatially modulated with a line-arrayed slit mask. Journal of the Korean Physical Society 60, 26–30 (2012). https://doi.org/10.3938/jkps.60.26
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.3938/jkps.60.26