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Excitation of higher harmonics in transient laser gratings by an ablative mechanism (1998)

Shen, Y.-C. ; Lomonosov, A. ; Frass, A. ; [et al.]

Woodbury, NY : American Institute of Physics (AIP)

Applied Physics Letters 73 (1998), S. 1640-1642

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ISSN: 1077-3118

Source: AIP Digital Archive

Topics: Physics

Notes: Laser-induced transient gratings were excited at the surface of an aluminum film by picosecond laser pulses. The counterpropagating surface acoustic waves with a fundamental frequency of 70 MHz that were launched were monitored outside the source region by laser probe beam deflection. The second and third harmonics were observed for ablative interaction of the laser radiation with the aluminum surface. A simple model is presented that describes the effects on the basis of nonlinear photoacoustic signal generation at the source due to a nonsinusoidal driving force. © 1998 American Institute of Physics.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.122231

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