co2+ & er3+ co-doped zno nanocrystals were synthesized by the hydrothermal method at 180°c and ph= 12 for 48 h. powder xrd patterns indicate that the zn1-2xerxcoxo crystals (0.00

BACKGROUND Reduced tooth structure in the pediatric and adolescent population is frequently restored with prefabricated zirconia crowns. On permanent teeth, these restorations may need to be removed replaced restorations. OBJECTIVES To explore compare use of 2 high-powered erbium lasers for removing crowns from molar teeth as a non-invasive alternative rotary instruments. MATERIAL AND METHODS T...

Abstract A hybrid Raman-erbium random fiber laser with a half-open cavity assisted by chirped artificially controlled backscattering reflectors is presented. combination of 2.4 km-long dispersion compensating two highly erbium-doped pieces 5 m length were used as gain media. single emission line centered at 1553.8 nm an optical signal to noise ratio 47 dB obtained when pumped 37.5 dBm. full wid...

A simple technique for simultaneous amplification and compression of ultrashort fundamental solitons is proposed. It is based on an erbium-doped nonlinear amplifying fiber loop mirror. Numerical simulations show that, unlike conventional erbium-doped fiber amplifiers in which nonlinear effects lead to serious degradation of pulse quality, the proposed device performs efficient high-quality ampl...

Fibers’ splicing is one of the essential and critical procedures for fiber optics and photonics devices, modules and networks. The purpose of this paper is to present a recommended apparatus which allows reducing the frequency to clean the electrodes of the fusion – splicer equipment when Corning’s erbium doped fibers are spliced together or to other type of all-silica fibers. Also, this recomm...

The threshold for ocular damage was determined in owl monkeys with the use of a Q-switched erbium-glass laser at 1.54/J. constructed in the laboratory. Ocular damage was limited to the cornea and characterized by localized opacification of the epithelium and stroma. All exposures to energy densities greater than 30 j./cm. produced injury. The median level for damage occurred at 21 j./cm., and n...

Silicon nanocrystals embedded in a silicon-rich silicon oxide matrix doped with Er3+ ions have been fabricated by electron cyclotron resonance plasma-enhanced chemical vapor deposition. Indirect excitation of erbium photoluminescence via silicon nanocrystals has been investigated. Temperature quenching of the photoluminescence originating from the silicon nanocrystals and the erbium ions has be...

We demonstrate an enhanced multiwavelength L-band Brillouin-erbium fiber laser (BEFL), in which the Brillouin pump is pre-amplified before entering the single-mode fiber. The Brillouin pump pre-amplification provided by the Erbium-doped fiber has created higher intensity of Brillouin Stokes line generated in the single-mode fiber that leads to the homogenous gain saturation. Thus the built-up o...

A nonlinear amplifying loop mirror constructed from erbium-doped fiber is proposed for simultaneous amplification and compression of ultrashort fundamental solitons. Numerical simulations show that, unlike conventional erbium-doped fiber amplifiers in which nonlinear effects lead to serious degradation of pulse quality, the proposed device performs efficient high-quality amplification and compr...

Peculiarities of the near-infrared and visible up-conversion spectra nanocrystalline (Er2O3)x (ZrO2)1-x have been studied. It is shown that for samples with 0.026 < x 0.143 photoluminescence Er3+ are defined a by similar erbium environment in spite different symmetry host ZrO2 matrix. The low temperature room emission bands spectral range 4I13/2 → 4I15/2 transition measured interpreted terms mu...