Abstract
Studies of the phonon spectra of YBa2Cu3Ox compounds can yield important information regarding the mechanism of superconductivity in high Tc materials. Recently, it has been shown that femtosecond pump-probe experiments can be used to induce and time resolve coherent optical phonons in semiconductors1 and metals2 with pulses of light that are short in duration compared with the characteristic periods of the lattice vibrations. These oscillations are generated and detected in a type of impulse-stimulated Raman-scattering (ISRS) experiment that uses two optical pulses. We have used two trains of ~100-fs pulses from a colliding-pulse, mode-locked dye laser (λ = 630 nm) to investigate thin films of YBa2Cu3Ox. The pump pulse train impulsively excited the lattice, modulating the refractive index, and the resulting transmissivity change was monitored by passing the probe beam through the semitransparent thin film onto a photodiode.
© 1991 Optical Society of America
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