B. Yazgan-Kokuoz

Clemson University

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John Ballato

Clemson University

P. Foy

Clemson University

R. Rice

University of California, Merced

R. H. Stolen

Clemson University

Colin D. McMillen

Clemson University

Thomas W. Hawkins

Clemson University

S. Morris

Clemson University

H.J. Rack

Clemson University

L. Burka

Clemson University

Thomas Hawkins

University College London

Cooperative Institutions

Clemson University

Materials Science & Engineering

Rutgers, The State University of New Jersey

University of California, Los Angeles

University of Southampton

Norwegian University of Science and Technology

KTH Royal Institute of Technology

Clausthal University of Technology

Brandenburg University of Technology Cottbus-Senftenberg

California NanoSystems Institute

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The high-cycle-fatigue performance of lightweight titanium automotive suspensions

JOM (2005)

Marcin Kocan Lothar Wagner B. Yazgan-Kokuoz H.J. Rack

Suspension

Titanium alloy

Metastability

Fatigue limit

10.1007/s11837-005-0031-3

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Citations (5)

Synthesis, Processing, and Properties of Submicrometer‐Grained Highly Transparent Yttria Ceramics

Journal of the American Ceramic Society (2010)

Karn Serivalsatit Baris Kokuoz B. Yazgan-Kokuoz Marian Kennedy John Ballato

In this article, we report on the fabrication of 0.3‐μm average grain‐sized transparent yttria ceramics using a modified two‐step sintering approach. This process yielded full densification of the yttria ceramics with a drastically reduced grain growth. These transparent yttria ceramics exhibited a transparency equivalent to that of single crystals in the near‐infrared spectral region. The microhardness and fracture toughness of the 0.3‐μm average grain‐sized transparent yttria ceramics fabricated by a modified two‐step sintering were found to exceed those of ∼300‐μm average grain‐sized transparent yttria ceramics fabricated by conventional sintering by 25 and 70%, respectively.

Transparent ceramics

10.1111/j.1551-2916.2010.03601.x

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Citations (110)

Advancements in semiconductor core optical fiber

Optical Fiber Technology (2010)

John Ballato Thomas Hawkins P. Foy B. Yazgan-Kokuoz Colin D. McMillen

Indium antimonide

10.1016/j.yofte.2010.08.006

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Citations (114)

Glass-clad single-crystal germanium optical fiber

Optics Express (2009)

John Ballato Thomas W. Hawkins P. Foy B. Yazgan-Kokuoz R. H. Stolen

Long lengths (250 meters) of a flexible 150 microm diameter glass-clad optical fiber containing a 15 microm diameter crystalline and phase-pure germanium core was fabricated using conventional optical fiber draw techniques. X-ray diffraction and spontaneous Raman scattering measurements showed the core to be very highly crystalline germanium with no observed secondary phases. Elemental analysis confirmed a very well-defined core-clad interface with a step-profile in composition and nominally 4 weight-percent oxygen having diffused into the germanium core from the glass cladding. For this proof-of-concept fiber, polycrystalline n-type germanium of unknown dopant concentration was used. The measured infrared transparency of the starting material was poor and, as a likely outcome, the attenuation of the resultant fiber was too high to be measured. However, the larger Raman cross-section, infrared and terahertz transparency of germanium over silicon should make these fibers of significant value for fiber-based mid- to long-wave infrared and terahertz waveguides and Raman-shifted infrared light sources once high-purity, high-resistivity germanium is employed.

Cladding (metalworking)

Germanium oxide

All-silica fiber

10.1364/oe.17.008029

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Citations (139)

Semiconductor Core Optical Fibers

IEEE photonics journal (2011)

S. Morris John Ballato Thomas W. Hawkins P. Foy B. Yazgan-Kokuoz

Presented here is a review of recent efforts to date in the field of semiconductor core optical fibers. Various processing techniques have been employed to fabricate such fibers and control the degree of crystallinity achieved within the fiber cores. Following the brief review of recent progress is a more in-depth look at the molten core approach, which allows for long lengths of highly crystalline semiconductor core fibers to be achieved.

10.1109/jphot.2011.2135847

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Citations (4)