Fig. 8.10 — Back-scattered light patterns from a focused beam

Fig. 8.10 — Back-scattered light patterns from a focused beam

Patterns generated at a glass–air interface as a function of the focus–interface distance (z). It can be seen how the pattern becomes smaller as the focus–interface distance decreases. The cross is due to the presence of polarisation elements; often, one can observe rings instead.

Fig. 8.10 — Back-scattered light patterns from a focused beam

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