Effects of optical penetration and laser pulse duration on laser generated longitudinal acoustic waves

Enguehard, Franck; Bertrand, Lionel

doi:10.1063/1.365954

Cited by 24 publications

(2 citation statements)

References 12 publications

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“…The TUG-based devices possess excellent electromagnetic compatibility because electrical wiring is not needed. Beam characteristics of laser-generated ultrasound can be partially controlled by changing the ratio between the laser pulse duration τ and the laser spot diameter, which can be imposed by appropriate lens choice [27], [28]. A large spot diameter with respect to c·τ determines a small beam aperture, and vice-versa, c being the material sound velocity.…”

Section: A Overviewmentioning

confidence: 99%

Toward virtual biopsy through an all fiber optic ultrasonic miniaturized transducer: a proposal

Acquafresca

Biagi

Masotti

et al. 2003

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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The present generation of devices based on opto-acoustic and acousto-optic conversion lets us foresee the possibility of realizing complete miniaturized transmitting-receiving transducers, able to generate and detect wideband ultrasounds by laser light. In the present paper, a miniaturized ultrasonic transducer entirely based on fiber optic technology is proposed. Such a device springs from the conjunction between our research, which has produced a highly efficient fiber optic opto-acoustic source, with the results obtained by other researchers concerning the realization of an ultrasonic receiver based on optical interferometry. Making use of the thermo-elastic effect for ultrasound generation, a source of ultrasound can be obtained by coupling a fiber optic to pulsed laser, if a film capable of absorbing laser light is placed onto fiber end. Starting from these remarks, we propose an efficient opto-acoustic source, able to generate pressure pulses with amplitude of the order of 10 4 Pa and bandwidth extending up to 40 MHz and beyond by using graphite materials as absorbing film. This solution makes use of a low-power pulsed laser as optical source possible. An ultrasonic receiving element was realized placing a Fabry-Perot cavity over the tip of a fiber optic. The cavity thickness modulation induced by ultrasonic beam is detected by an interferometer optical technique. We have realized a prototype of a receiving device that exhibits a sensitivity comparable with that of piezoelectric devices (10-100 nV/Pa) and an almost flat bandwidth extending up to 20 MHz or more. The extreme miniaturization of the resulting ultrasonic transducer, together with its wide ultrasonic frequency bandwidth, is the first step toward ultrasonic tissue biopsy. In this paper, before discussing the problem of constructing a complete ultrasonic transducer composed by a transmitter and receiver, the results carried out in these fields during the last decade are reviewed.

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Section: A Overviewmentioning

confidence: 99%

Toward virtual biopsy through an all fiber optic ultrasonic miniaturized transducer: a proposal

Acquafresca

Biagi

Masotti

et al. 2003

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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“…McDonald [10] examined the significance of thermal diffusion for generating thermoelastic waves in the metals created by Gaussian laser beams heating a surface. Furthermore, Enguehard and Bertrand [11] explored the laser pulse's influence and the optical penetration depth duration on longitudinal acoustic waves caused by absorption of a volumetric laser beam.…”

Section: Introductionmentioning

confidence: 99%

Generalized Thermoelastic Functionally Graded on a Thin Slim Strip Non-Gaussian Laser Beam

2020

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The present study utilizes the generalized thermoelasticity theory, with one thermal relaxation time (TR), to examine the thermoelastic problem of a functionally graded thin slim strip (TSS). The authors heated the plane surface bounding using a non-Gaussian laser beam with a pulse length of 2 ps. The material characteristics varied continually based on exponential functions. Moreover, the equations governing the generalized thermoelasticity for a functionally graded material (FGM) are recognized. The problem’s ideal solution was primarily obtained in the Laplace transform (LT) space. The LTs were converted numerically because of the considerable importance of the response in the transient state. For a hypothetical substance, the numerical procedures calculating the displacement, stress, temperature and strain were given. The analogous problem solution to an isotropic homogeneous material was provided by defining the parameter of non-homogeneity adequately. The obtained results were displayed using graphs to illustrate the extent to which non-homogeneity affected displacement, stress, temperature and strain. A comparison was been made between the present study and those previously obtained by others, when the new parameters vanish to show the impact of the non-homogeneity, TSS and laser parameters on the phenomenon. The results obtained indicate a significant strong impact of FGM, TSS and laser parameters.

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One-Dimensional Prediction of the Acoustic Waves Generated in a Multilayer Viscoelastic Body by Microwave Irradiation

Bacon

Hosten

Guilliorit

2000

Journal of Sound and Vibration

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Effects of optical penetration and laser pulse duration on laser generated longitudinal acoustic waves

Cited by 24 publications

References 12 publications

Toward virtual biopsy through an all fiber optic ultrasonic miniaturized transducer: a proposal

Toward virtual biopsy through an all fiber optic ultrasonic miniaturized transducer: a proposal

Generalized Thermoelastic Functionally Graded on a Thin Slim Strip Non-Gaussian Laser Beam

One-Dimensional Prediction of the Acoustic Waves Generated in a Multilayer Viscoelastic Body by Microwave Irradiation

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