Explorations in Optical Spatial Coherence: Superresolution and Graded-Index Fibers

laser beams

Department of Physics

Location: Burchard 714

Speaker: Sultan Abdul Wadood, Princeton University, Princeton, NJ

Abstract

The coherence of an optical field is an important degree of freedom; it affects fundamental properties such as directionality, spectra, and image formation. In this talk, I will explore novel effects of spatial coherence in two domains. Firstly, I will discuss how spatial coherence affects the resolution of imaging systems that outperform the Rayleigh limit, i.e., superresolving systems. Two point sources that are partially coherent are shown to be better resolved than incoherent point sources. For general object scenes too, partial coherence affords higher resolution than the incoherent case. Secondly, using mathematical techniques from quantum optics, I will discuss the propagation of partially coherent beams in modulated graded-index fibers. Like a swing that sees parametric resonances, partially coherent beams also see resonances in their coherence and intensity widths. Resultant beams are shown to be analogues of quantum optical squeezed states.

Biography

Sultan Abdul Wadood

Dr. Sultan Wadood is a Postdoctoral Research Associate in the Electrical and Computer Engineering department at Princeton University. His research focuses on quantum and classical statistical optics, with particular emphasis on using quantum inspired techniques for superresolution. He obtained a Ph.D. in optics from the Institute of Optics at the University of Rochester.

Contact:

[email protected]

[email protected]