Abstract

The acoustic and flexural vibrations of a small-scale floating structure following irradiation by a pulsed Nd:glass laser are compared with a radiated underwater sound field. A single subablative laser pulse of 600-μs duration was used both to bend and shock the floating structure at the irradiation site. The laser pulse caused the structure to flex at a frequency of approximately 1 kHz whereas relaxation oscillations in the laser output simultaneously excited ultrasonic Lamb waves within the material bulk. We present results to illustrate the broad bandwidth provided by this unusual form of excitation.

© 1996 Optical Society of America

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  1. J. F. Ready, Effects of High-Power Laser Radiation (Academic, New York, 1971).
  2. L. L. Koss, R. C. Tobin, “Laser induced structural vibration,” J. Sound Vib. 86, (1)1–7 (1983).
  3. W. R. Philp, D. J. Booth, “Laser excitation of transverse mechanical vibrations in structures,” Non-Destr. Test. (Australia) 30, (4)104–108 (1993).
  4. D. A. Hutchins, “Ultrasonic generation by pulsed lasers,” in Physical Acoustics, W. P. Mason, R. N. Thurston, eds. (Academic New York, 1988), Vol. 18 pp. 21–123.
  5. W. R. Philp, D. J. Booth, N. D. Perry, “Single pulse laser excitation of structural vibration using power densities below the surface ablation threshold,” J. Sound Vib. 185, (4)643–654 (1995).
  6. A. C. Tam, “Applications of photoacoustic sensing techniques,” Rev. Mod. Phys. 58, 381–431 (1986).
  7. C. B. Scruby, L. E. Drain, Laser Ultrasonics, Techniques and Applications (Hilger, New York, 1990).
  8. I. A. Viktorov, Rayliegh and Lamb Waves; Physical Theory and Application (Plenum, New York, 1967), Chap. 2, p. 67.
  9. A. C. Bushell, C. Edwards, S. B. Palmer, “Laser-generated surface waves on plates of varying thickness,” Br. J. Non-Destr. Test. 33, (4)177–182 (1991).
  10. R. J. Dewhurst, C. Edwards, A. D. W. McKie, S. B. Palmer, “Estimation of the thickness of thin metal sheet using laser generated ultrasound,” Appl. Phys. Lett. 51, 1006 (1987).
  11. W. R. Philp, D. J. Booth, A. Shelamoff, M. J. Linthwaite, “A simple fibre optic sensor for measurement of vibrational frequencies,” Meas. Sci. Technol. 3, 603–606 (1992).

1995 (1)

W. R. Philp, D. J. Booth, N. D. Perry, “Single pulse laser excitation of structural vibration using power densities below the surface ablation threshold,” J. Sound Vib. 185, (4)643–654 (1995).

1993 (1)

W. R. Philp, D. J. Booth, “Laser excitation of transverse mechanical vibrations in structures,” Non-Destr. Test. (Australia) 30, (4)104–108 (1993).

1992 (1)

W. R. Philp, D. J. Booth, A. Shelamoff, M. J. Linthwaite, “A simple fibre optic sensor for measurement of vibrational frequencies,” Meas. Sci. Technol. 3, 603–606 (1992).

1991 (1)

A. C. Bushell, C. Edwards, S. B. Palmer, “Laser-generated surface waves on plates of varying thickness,” Br. J. Non-Destr. Test. 33, (4)177–182 (1991).

1987 (1)

R. J. Dewhurst, C. Edwards, A. D. W. McKie, S. B. Palmer, “Estimation of the thickness of thin metal sheet using laser generated ultrasound,” Appl. Phys. Lett. 51, 1006 (1987).

1986 (1)

A. C. Tam, “Applications of photoacoustic sensing techniques,” Rev. Mod. Phys. 58, 381–431 (1986).

1983 (1)

L. L. Koss, R. C. Tobin, “Laser induced structural vibration,” J. Sound Vib. 86, (1)1–7 (1983).

Booth, D. J.

W. R. Philp, D. J. Booth, N. D. Perry, “Single pulse laser excitation of structural vibration using power densities below the surface ablation threshold,” J. Sound Vib. 185, (4)643–654 (1995).

W. R. Philp, D. J. Booth, “Laser excitation of transverse mechanical vibrations in structures,” Non-Destr. Test. (Australia) 30, (4)104–108 (1993).

W. R. Philp, D. J. Booth, A. Shelamoff, M. J. Linthwaite, “A simple fibre optic sensor for measurement of vibrational frequencies,” Meas. Sci. Technol. 3, 603–606 (1992).

Bushell, A. C.

A. C. Bushell, C. Edwards, S. B. Palmer, “Laser-generated surface waves on plates of varying thickness,” Br. J. Non-Destr. Test. 33, (4)177–182 (1991).

Dewhurst, R. J.

R. J. Dewhurst, C. Edwards, A. D. W. McKie, S. B. Palmer, “Estimation of the thickness of thin metal sheet using laser generated ultrasound,” Appl. Phys. Lett. 51, 1006 (1987).

Drain, L. E.

C. B. Scruby, L. E. Drain, Laser Ultrasonics, Techniques and Applications (Hilger, New York, 1990).

Edwards, C.

A. C. Bushell, C. Edwards, S. B. Palmer, “Laser-generated surface waves on plates of varying thickness,” Br. J. Non-Destr. Test. 33, (4)177–182 (1991).

R. J. Dewhurst, C. Edwards, A. D. W. McKie, S. B. Palmer, “Estimation of the thickness of thin metal sheet using laser generated ultrasound,” Appl. Phys. Lett. 51, 1006 (1987).

Hutchins, D. A.

D. A. Hutchins, “Ultrasonic generation by pulsed lasers,” in Physical Acoustics, W. P. Mason, R. N. Thurston, eds. (Academic New York, 1988), Vol. 18 pp. 21–123.

Koss, L. L.

L. L. Koss, R. C. Tobin, “Laser induced structural vibration,” J. Sound Vib. 86, (1)1–7 (1983).

Linthwaite, M. J.

W. R. Philp, D. J. Booth, A. Shelamoff, M. J. Linthwaite, “A simple fibre optic sensor for measurement of vibrational frequencies,” Meas. Sci. Technol. 3, 603–606 (1992).

McKie, A. D. W.

R. J. Dewhurst, C. Edwards, A. D. W. McKie, S. B. Palmer, “Estimation of the thickness of thin metal sheet using laser generated ultrasound,” Appl. Phys. Lett. 51, 1006 (1987).

Palmer, S. B.

A. C. Bushell, C. Edwards, S. B. Palmer, “Laser-generated surface waves on plates of varying thickness,” Br. J. Non-Destr. Test. 33, (4)177–182 (1991).

R. J. Dewhurst, C. Edwards, A. D. W. McKie, S. B. Palmer, “Estimation of the thickness of thin metal sheet using laser generated ultrasound,” Appl. Phys. Lett. 51, 1006 (1987).

Perry, N. D.

W. R. Philp, D. J. Booth, N. D. Perry, “Single pulse laser excitation of structural vibration using power densities below the surface ablation threshold,” J. Sound Vib. 185, (4)643–654 (1995).

Philp, W. R.

W. R. Philp, D. J. Booth, N. D. Perry, “Single pulse laser excitation of structural vibration using power densities below the surface ablation threshold,” J. Sound Vib. 185, (4)643–654 (1995).

W. R. Philp, D. J. Booth, “Laser excitation of transverse mechanical vibrations in structures,” Non-Destr. Test. (Australia) 30, (4)104–108 (1993).

W. R. Philp, D. J. Booth, A. Shelamoff, M. J. Linthwaite, “A simple fibre optic sensor for measurement of vibrational frequencies,” Meas. Sci. Technol. 3, 603–606 (1992).

Ready, J. F.

J. F. Ready, Effects of High-Power Laser Radiation (Academic, New York, 1971).

Scruby, C. B.

C. B. Scruby, L. E. Drain, Laser Ultrasonics, Techniques and Applications (Hilger, New York, 1990).

Shelamoff, A.

W. R. Philp, D. J. Booth, A. Shelamoff, M. J. Linthwaite, “A simple fibre optic sensor for measurement of vibrational frequencies,” Meas. Sci. Technol. 3, 603–606 (1992).

Tam, A. C.

A. C. Tam, “Applications of photoacoustic sensing techniques,” Rev. Mod. Phys. 58, 381–431 (1986).

Tobin, R. C.

L. L. Koss, R. C. Tobin, “Laser induced structural vibration,” J. Sound Vib. 86, (1)1–7 (1983).

Viktorov, I. A.

I. A. Viktorov, Rayliegh and Lamb Waves; Physical Theory and Application (Plenum, New York, 1967), Chap. 2, p. 67.

Appl. Phys. Lett. (1)

R. J. Dewhurst, C. Edwards, A. D. W. McKie, S. B. Palmer, “Estimation of the thickness of thin metal sheet using laser generated ultrasound,” Appl. Phys. Lett. 51, 1006 (1987).

Br. J. Non-Destr. Test. (1)

A. C. Bushell, C. Edwards, S. B. Palmer, “Laser-generated surface waves on plates of varying thickness,” Br. J. Non-Destr. Test. 33, (4)177–182 (1991).

J. Sound Vib. (2)

L. L. Koss, R. C. Tobin, “Laser induced structural vibration,” J. Sound Vib. 86, (1)1–7 (1983).

W. R. Philp, D. J. Booth, N. D. Perry, “Single pulse laser excitation of structural vibration using power densities below the surface ablation threshold,” J. Sound Vib. 185, (4)643–654 (1995).

Meas. Sci. Technol. (1)

W. R. Philp, D. J. Booth, A. Shelamoff, M. J. Linthwaite, “A simple fibre optic sensor for measurement of vibrational frequencies,” Meas. Sci. Technol. 3, 603–606 (1992).

Non-Destr. Test. (Australia) (1)

W. R. Philp, D. J. Booth, “Laser excitation of transverse mechanical vibrations in structures,” Non-Destr. Test. (Australia) 30, (4)104–108 (1993).

Rev. Mod. Phys. (1)

A. C. Tam, “Applications of photoacoustic sensing techniques,” Rev. Mod. Phys. 58, 381–431 (1986).

Other (4)

C. B. Scruby, L. E. Drain, Laser Ultrasonics, Techniques and Applications (Hilger, New York, 1990).

I. A. Viktorov, Rayliegh and Lamb Waves; Physical Theory and Application (Plenum, New York, 1967), Chap. 2, p. 67.

D. A. Hutchins, “Ultrasonic generation by pulsed lasers,” in Physical Acoustics, W. P. Mason, R. N. Thurston, eds. (Academic New York, 1988), Vol. 18 pp. 21–123.

J. F. Ready, Effects of High-Power Laser Radiation (Academic, New York, 1971).

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