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Transient grating measurement of surface acoustic waves in thin metal films with extreme ultraviolet radiation
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View: Figures


Image of FIG. 1.
FIG. 1.

(Color online) Experimental setup for a transient grating geometry using visible pump and EUV probe beams. A portion of the ultrafast amplified laser output is upconverted into the EUV to generate a short wavelength beam for probing optically excited surface acoustic waves in homogenous thin films. The time evolution of the diffracted EUV light reveals the acoustic wave propagation. (a) Typical CCD exposure shown at the maximum surface deformation. (b) Close-up of sample geometry, showing backside impulsive excitation and direction of acoustic wave propagation.

Image of FIG. 2.
FIG. 2.

Absolute diffraction efficiency of the EUV probe as a function of pump-probe time delay for a nominally thick nickel film on fused silica at an absorbed excitation fluence of and spatial periodicities of (a) , (b) , (c) , and (d) . Impulsive excitation of the sample in the TG configuration launches two narrowband counterpropagating sine-profile surface acoustic waves, which leads to periodic modulation in the diffracted intensity of the EUV probe.

Image of FIG. 3.
FIG. 3.

(Color online) Dispersion data and theoretical fits of acoustic velocity at several different acoustic wavelengths (i.e., transient grating periodicities) for thin Ni films on fused silica substrates. The fits yield film thickness values of (filled squares and solid line), (open circles and dashed line), and (filled triangles and dotted line) films.


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Scitation: Transient grating measurement of surface acoustic waves in thin metal films with extreme ultraviolet radiation