Simultaneous measurements of the intensity and phase of a probe wave reflected from an interface between silica and elemental {α}-gallium reveal its very strong optical nonlinearity, affecting both these parameters of the reflected wave. The data corroborate with a nonthermal mechanism of optical response which assumes appearance of a homogeneous highly metallic layer, only a few nanometer thick, between the silica and bulk {α}-gallium.
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Petropoulos et al. (2001) studied this question.
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