PHASE STRUCTURED WAVEFIELDS WITH PHASE SINGULARITIES AND BISPECTRAL PROPERTIES

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Scipioni, M. (2010). PHASE STRUCTURED WAVEFIELDS WITH PHASE SINGULARITIES AND BISPECTRAL PROPERTIES. Unc Charlotte Electronic Theses And Dissertations.
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Abstract

The work presented in this dissertation can be subdivided into two parts. The first part illustrates the novel use of a 37 actuator segmented deformable mirror for the creation of optical vortex beams ranging in topological charge from 1 to 10. The segmented deformable mirror offers a dynamic, polarization independent alternative for creating vortex beams with arbitrary charge. An optical vortex mode purity comparison between the deformable mirror and multi-step diffractive phase plates with 16 and 32 discrete steps is carried out both analytically and in simulation. Computer simulations show the intensity and phase of the vortices generated with the two methods. The deformable mirror, by being reconfigurable, shows better mode purity for high charge OVs, while the static phase plate mode efficiency declines due to the fixed number phase quantization.The second part of the dissertation reviews the concept of the bispectrum (3rd order polyspectrum) and the possibility of creating partially spatially coherent beams with nonzero bispectral characteristics. Numerical simulations show that bispectral properties encoded in an input wavefield are invariant upon propagation in free space.This result opens the possibility of using the bispectrum as a new degree of freedom for encoding information in a wavefield.

Details
Author

Scipioni, Marco

Title

PHASE STRUCTURED WAVEFIELDS WITH PHASE SINGULARITIES AND BISPECTRAL PROPERTIES

Physical Description

1 online resource (80 pages) : PDF

Date

2010

Degree Granting Institution

University of North Carolina at Charlotte

Abstract

The work presented in this dissertation can be subdivided into two parts. The first part illustrates the novel use of a 37 actuator segmented deformable mirror for the creation of optical vortex beams ranging in topological charge from 1 to 10. The segmented deformable mirror offers a dynamic, polarization independent alternative for creating vortex beams with arbitrary charge. An optical vortex mode purity comparison between the deformable mirror and multi-step diffractive phase plates with 16 and 32 discrete steps is carried out both analytically and in simulation. Computer simulations show the intensity and phase of the vortices generated with the two methods. The deformable mirror, by being reconfigurable, shows better mode purity for high charge OVs, while the static phase plate mode efficiency declines due to the fixed number phase quantization.The second part of the dissertation reviews the concept of the bispectrum (3rd order polyspectrum) and the possibility of creating partially spatially coherent beams with nonzero bispectral characteristics. Numerical simulations show that bispectral properties encoded in an input wavefield are invariant upon propagation in free space.This result opens the possibility of using the bispectrum as a new degree of freedom for encoding information in a wavefield.

Genre

doctoral dissertations

Subjects--Topics

Optics

Degree

Ph.D.

Keywords

Bispectrum
Deformable Mirror
Optical Vortices
Phase

Subject Area

Optical Science and Engineering

Advisor(s)

Tyson, Robert

Committee Members

Fiddy, Michael
Gbur, Greg
Dmochowski, Jacek

Degree Note

Thesis (Ph.D.)--University of North Carolina at Charlotte, 2010.

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Rights Holder Information

Copyright is held by the author unless otherwise indicated.

Identifier

Scipioni_uncc_0694D_10159

Permalink

http://hdl.handle.net/20.500.13093/etd:1152