We present a time resolved spectroscopy for the picosecond ultrasonics technique. Detection of picosecond coherent phonons using a wavelength continuum generation in a photonic crystal fiber with femtosecond laser pulses is introduced. Measurements are performed on two samples made of tungsten and gallium arsenide for selected wavelengths of probe pulses within a bandwidth of 250nm with an 825nm center wavelength. Characteristic changes of the shape of the acoustic signal due to the selection of the probe wavelength are shown.
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Rossignol et al. (2006) studied this question.
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