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Nonlinear Spectroscopy of Optical Ceramics

Nonlinear Spectroscopy of Optical Ceramics Stephen C. Rand, University of Michigan Ann Arbor, DMR 0502715.

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Nonlinear Spectroscopy of Optical Ceramics

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  1. Nonlinear Spectroscopy of Optical Ceramics Stephen C. Rand, University of Michigan Ann Arbor, DMR 0502715 Optical grade ceramics with grain sizes on the order of 20 mm have found widespread applications in high power lasers and high intensity lighting in recent years. However this research project has concentrated on novel functionality in nano-grained ceramics - searching not only for new laser candidates, but also quantum size effects, enhanced upconversion and magnetic properties. Spatial radiation pattern of intense magnetic dipole (MD) emission (filled circles) from a nonmag-netic insulator In 2008 Prof. Rand and his group demonstrated a color display and developed a concept for 3-D projection based on the optimization of nano-grained yttria ceramics for infrared-to-visible up-conversion (upper right). Ref: T.R. Hinklin, S.C. Rand and R.M. Laine, Adv. Mater. 20, 1-4(2008) A major discovery applicable to the optical properties of all nano- ceramics was also reported and explained during this period. Light- scattering intensity measurements (lower right) revealed a new non- linear process that can render centro-symmetric insulators intensely magnetic. The quadratic optical process induces strong magnetiza- tion in all dielectrics, resulting in internal fields of several Tesla at relatively weak pump intensities. Refs: S.C. Rand et al., JOSA B 25, 1106 (2008); S.C. Rand, Nature Physics (under review) MD emission vs. input intensity, showing the first example of a quadratic, mag- netic nonlinear optical effect in a structureless medium.

  2. Nonlinear Spectroscopy of Optical CeramicsStephen C. Rand, University of Michigan Ann Arbor, DMR 0502715 Optical spectroscopy of novel ceramics is an essential tool that can improve our understanding of how processing affects functionality. It provides a superb, tabletop training ground for the next generation of scientists tackling hard problems in inter-disciplinary science. • Broader impacts in 2008: • Teaching & summer research was undertaken by undergraduate • Matthew Carey - 2008 REU (UM Engineering Physics) • (Project:Mode-locked laser for ceramic studies - top & middle left) • (Teaching: Prepared teaching module on prisms for long-distance learning • broadcasts by Inter-Pro of the University of Michigan) • Graduate student William Fisher spent several weeks in Recife, • Brazil. There he learned to characterize optical nonlinearities • using the Z-scan technique and gave a seminar (middle right). • Preliminary measurements with the Recife group indicated that hybrid • organic-inorganic ceramics have exceptionally large nonlinear coefficients. • Graduate student Yuwei Li (bottom left) began thesis research • on Si-based ceramics. • Preliminary results on the first intense magnetic emission from solids • Prof. Leonardo Menezes (bottom right) visited Ann Arbor from • Recife, Brazil, gave a seminar on his materials research. • Worked with Fisher in the lab to complete an ultrafast optical correlator.

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