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The frequency up-shifts of ultrashort laser pulses (65 fs) propagating in opposite directions (20^∘{} and 160^∘{}) with respect to a relativistic ionization front (interface gas plasma) are measured for the first time. Up-shifts of the order of 25 nm are observed. A very good agreement is found with a two-dimensional ray-tracing theory.
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Dias et al. (1997) studied this question.
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