Special Section on Speckle-Based Metrology

Comparisons between singularities of pseudophase and speckle phase using binary diffusers in optical vortex metrology

[+] Author Affiliations
Francisco E. Veiras

Instituto Nacional de Tecnología Industrial, Electrónica e Informática, P.O. Box B1650WAB, B1650KNA San Martín, Argentina

Universidad de Buenos Aires, Grupo de Láser, Optica de Materiales y Aplicaciones Electromagnéticas, Departamento de Física, Facultad de Ingeniería, Avenida Paseo Colón 850, Ciudad Autónoma de Buenos Aires, C1063ACV, Argentina

Ana Laura Vadnjal, Pablo Etchepareborda, Arturo Bianchetti, Alejandro Federico

Instituto Nacional de Tecnología Industrial, Electrónica e Informática, P.O. Box B1650WAB, B1650KNA San Martín, Argentina

Guillermo H. Kaufmann

Instituto de Física Rosario (CONICET-UNR), Ocampo y Esmeralda, S2000EZP Rosario, Argentina

Opt. Eng. 55(12), 121712 (Jul 12, 2016). doi:10.1117/1.OE.55.12.121712
History: Received March 11, 2016; Accepted June 23, 2016
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Abstract.  An analysis based on the comparison between singularities of speckle phase and pseudophase in the practice of optical vortex metrology is carried out by measuring the phase map of the speckle pattern obtained from the transmitted light through binary diffusers. In the characterization of the core structure of both phase singularities, the variation of the measured parameters is produced by means of in-plane linear displacements and rotations of the scattered speckle fields. These fields are addressed by using similar displacements of the binary phase masks recorded in a spatial light modulator (SLM). We complete these comparisons by measuring out-of-plane variations of the core structure parameters. In addition, we verified that the phase map of the transmitted light beam through the binary diffusers recorded in SLMs is actually characterized by a speckle phase with vortices of unitary charge. The presented analysis would be helpful for understanding the scope and limitations of the use of the singularities of speckle phase and pseudophase as position marking, and also for speckle measurement of in-plane rigid-body displacements of binary diffusers dynamically controlled by means of SLMs.

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© 2016 Society of Photo-Optical Instrumentation Engineers

Citation

Francisco E. Veiras ; Ana Laura Vadnjal ; Pablo Etchepareborda ; Arturo Bianchetti ; Alejandro Federico, et al.
"Comparisons between singularities of pseudophase and speckle phase using binary diffusers in optical vortex metrology", Opt. Eng. 55(12), 121712 (Jul 12, 2016). ; http://dx.doi.org/10.1117/1.OE.55.12.121712


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