This article is cited in 2 papers

Laser applications and other topics in quantum electronics

Screw dislocations of laser speckle fields in interferograms with a circular line structure

B. D. Bobrov


Abstract: Experimental results are used to show that circular interferograms are of interest in studies of screw dislocations of speckle-distorted laser beams because of a close correspondence between the symmetry of these interferograms and defects. The presence of dislocations transforms a system of the usual rings into a split network. Typical structure elements of such interferograms are right- and left-handed spirals connecting singular points of dislocations. Spiral fragments can be used in the diagnostics of dislocations regarded as independent defects. A method is suggested for the formation of highly directed optical beams with a low level of the usual aberrations, but with a complex phase surface topology. Screw dislocations are shown to be a natural analog of helical waves known in optics and capable of deliberate generation.

UDC: 621.373.826

PACS: 07.60.Ly, 42.30.Ms, 42.55.Lt, 42.60.Jf

Received: 25.05.1990
Revised: 17.12.1990

 English version: Soviet Journal of Quantum Electronics, 1991, 21:7, 802–806

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