Abstract
Interference between different quantum processes opens a prospect of a new degree of freedom in the control of physical processes—not only by the intensity or the polarization of light, but also by the phase of light.1,2 SHG via photoinduced spatially oscillating electrostatic fields in glass was probably the first observed phenomenon where photocurrent resulting from interference between the one- and two-photon transition moments was involved.3–5 However, modulation of the total cross section of ionizing transitions resulting from quantum interference (coherent photoconductivity) has been observed only in atomic systems.6 Here we report the first, to our knowledge, experimental evidence of coherent photoconductivity in solid state materials—observation of efficient second-harmonic generation in glass subjected to a strong external electrostatic field.
© 1997 Optical Society of America
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