Using a mobile photothermal probe we show that it is possible to detect rapidly different type of cracks (emerging ones or not), their width being a few micrometers and their depth being some hundredths of micrometers

We present a general theory of Raman scattering near the surface of a plane dielectric medium. All possible cases are considered but only the ones in which evanescent waves are present are discussed (evanescent excitation or/and evanescent scattering). In each case the intensity and angular distribution patterns of the scattered light are discussed. The problem of measurement of depolarization ratios of Raman bands is also considered.

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