Silver doped hydroxyapatite was prepared by the precipitation method, using the precursor of hydroxyapatite, CaCl2-0.5M and (NH4) 2HPO4-0.3M; silver sulfate (Ag2SO4) is added to the precursors in order to bring the ions of silver (Ag at 10%) in the structure of hydroxyapatite. The morphology, structure and composition of prepared samples were characterized by X-ray diffraction, the complex ther...

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The blueshift of near-band-edge emission and excitonic absorption indicate that Zn(2+) ions are successfully substituted by Mg(2+) ions in Mg(x)Zn(1-x)O nanopowders for 0≤x≤0.14. The changes in Raman spectral linewidth and the asymmetry of the E(2) (high) mode for various Mg contents can be well described by a modified spatial correlation model that considers the grain size distribution. With i...

A diode-pumped picosecond laser was demonstrated with Yb-doped yttrium lanthanum oxide transparent laser ceramic Yb:(Y1−xLax)2O3 (x= 0.1), which was fabricated with nanopowders and sintered in H2 atmosphere. Passive modelocking was realized for the first time to our knowledge with a semiconductor saturable absorber mirror, generating pulses of 174 ps at the central wavelength 1032.5 nm with the...

We report continuous-wave laser action in two oxide nanopowders doped with Ce and Pr ions. To our knowledge, these are the first observations of stimulated emission from electrically pumped random media in which scattering and distributed feedback scale lengths are much shorter than a wavelength. The continuous nature of the laser emission in small volumes ~on the order of a cubic wavelength! o...