Abstract

Photoelectron spectroscopy on an α-quartz surface with intense subpicosecond laser pulses reveals strong differences between the spectra obtained with two different wavelengths. For intensities above 100 GW/cm2, a high-energy tail spreads out in the photoemission spectra at 620 nm, but no effect is observed at 310 nm. Multiple photon absorption by free electrons in the conduction band can explain the dependence of the spectra on the laser wavelength and intensity, and Monte Carlo simulations including such mechanisms are in good agreement with the experimental results.

© 1996 Optical Society of America

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