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Interference diagnostics of white-light vortices

Oleg V. Angelsky, Alexander P. Maksimyak, Peter P. Maksimyak, and Steen G. Hanson

Open Access Open Access

Abstract

The principles and the practical conditions for registration of phase singularities, such as optical vortices in the spectral components of white light, are discussed. Interference diagnostics of white light vortices in a polychromatic speckle-field is reported for the first time.

©2005 Optical Society of America

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Figures (3)
Fig. 1.
Fig. 1. Experimental arrangement: S – white light source; C – condenser; D – diaphragm; O1, O2, O3 and O4 – objectives; P1 and P2 – polarizer and analyzer; BS1 and BS2 – beam-splitting cubes; M1 and M2 – mirrors; BC – singularity-generating object; CP – compensating plate; RF – Fresnel rhombus; W1 and W2 – moving and stationary optical wedges; CCD – camera.

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Fig. 2.
Fig. 2. Singularity obtained in a white light beam passing a double-axial crystal placed between matched polarizer and analyzer: (a) without reference wave; (b) with a reference wave.

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Fig. 3.
Fig. 3. Left column illustrates the intensity distributions for a field scattered by a deep phase screen at different distances (from z = -500 μm to z = 500 μm). Right column shows interference patterns for various cross-sections of the object field with the reference beam.

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