Publications by authors named "Kent Averett"
Yttrium aluminum garnet (YAG) is a common host material for both bulk and single-crystal fiber lasers. With increasing interest in developing optical technologies in the short-wave infrared and mid-infrared wavelength range, YAG may be a potential supercontinuum medium for these applications. Here, we characterize femtosecond laser pumped supercontinuum generation with 1200-2000 nm pump wavelengths () for undoped, single-crystal YAG fibers, which are representative of the normal, zero, and anomalous-dispersion regimes.
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- Researchers created seven p-type AlGaN samples with about 25% aluminum content using molecular beam epitaxy to study their p-type performance, focusing on different doping structures.
- A layer-structured sample showed better electrical properties, exhibiting lower sheet resistance and higher effective hole mobility compared to a uniformly Mg-doped reference sample, due to effective hole diffusion between layers.
- The best performance was found in a sample with alternating Mg-doped and undoped layers of 6/4 nm thickness, achieving significantly lower sheet resistance and higher hole mobility compared to uniform doping.
A polycrystalline 1.5% Ho: YAG fiber with a diameter of 31 µm was prepared. Surface roughness from grain boundary grooving was reduced by polishing, which decreased the fiber scattering coefficient from 76 m to 35 m.
View Article and Find Full Text PDFPulsed-laser deposited transition-metal carbides for field-emission cathode coatings.
ACS Appl Mater Interfaces
September 2013
Thin films of transition-metal carbides ZrC, HfC, and TiC were deposited by pulsed-laser deposition under vacuum. The surface chemistry of the films was characterized with ultraviolet photoelectron spectroscopy, X-ray photoelectron spectroscopy, and Auger electron spectroscopy in situ. X-ray diffraction was used to characterize the film structure.
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