FIELD: optical data carriers.
SUBSTANCE: method includes focusing main and auxiliary laser emission beams on working surface, continuous determining of distance to recording point and correcting of main laser focus accordingly to change of distance from recording point. Determining space from recording point is performed during space combination of optical paths of two falling beams, with measurement of alteration of energy distribution of auxiliary reflected beam in registration plane due to forming of astigmatism of reflected beam.
EFFECT: higher quality, higher precision, higher efficiency.
3 cl, 3 dwg
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