Colloquium: Russell Chipman

    Date: 
    Thursday, April 20, 2017 - 3:30pm - 5:00pm
    Location: 
    Meinel 307
    Description: 

    Berry Phase, Polarization, and the Point Spread Function

    Abstract(s): 

    Optical design methods for the incorporation of polarization continue to evolve. The effect of these polarization aberrations on diffraction image formation are discussed for several types of systems including space-based polarimeters and coronagraphs. One topic is the polarization rotation of skew rays. When light rays propagate through optical systems, the polarization state folds at each interface as the light changes direction on reflection or refraction. For meridional rays the light’s phase is not affected by these direction changes. But for skew rays which spiral around the optical axis in either a clockwise, for one side of the pupil, or a counterclockwise sense for the other side, a phase change occurs oppositely for right and left circularly polarized light. In quantum mechanics this is known as the Berry phase, arising from the parallel transport of vectors along great circles over a sphere. The variation of the Berry phase across a wavefront is known as “skew aberration” since it occurs for skew, but not marginal rays. The form of the skew aberration and other polarization aberrations on the point spread function are investigated.

    Speaker Bio(s): 

    Russell Chipman is Professor of Optical Sciences at the University of Arizona, Tucson, AZ, and a Visiting Professor at the Center for Optics Research and Education, Utsunomiya University, Japan. Prof. Chipman received his BS from MIT and MS and Ph. D. in Optical Science from the University of Arizona.  He is a Fellow of OSA and SPIE. He received SPIE’s 2007 G. G. Stokes award for research in Polarimetry and OSA’s Joseph Fraunhofer Award/Robert Burley Award for Optical Engineering in 2015. He recently developed the Polaris-M polarization ray tracing code which analyzes optical systems with anisotropic materials, electro-optic modulators, diffractive optical elements, polarized scattered light, and many other effects.