Osama H. El-Bayoumi

Comparative study of BaF2/ThF4 glasses containing YF3, YbF3 and LuF3

Abstract A series of glasses of composition (mol %) (x)BaF 2 − (33.3−x/3)ZnF 2 − (33.3−x/3) − (33.3−x/3)ThF 4 , where M = Y or Yb and x = 10–25 were synthesized. Optical, thermal and microhardness measurements were made and the data compared with that for fluorozirconate, fluorohafnate, and glasses where M = Lu. The subject materials have higher glass transition and crystallization temperatures, higher hardness and somewhat lower UV absorption coefficients than typical ZrF 4 /HfF 4 -based glasses.

Infrared Fibers: An Overview Of Prospective Materials, Fabrication Methods, And Applications

An overview of IR fibers is presented, including prospective crystalline and vitreous materials; fiber fabrication methods such as drawing from preforms, crucible draw, pedestal growth, and extrusion; and applications such as ultralong repeaterless links, IR imaging, and IR power transmission.

Rayleigh And Brillouin Scattering In Heavy Metal Fluoride Glasses: Intrinsic Rayleigh Scattering

Heavy metal fluoride glasses are a recently synthesized class of nonoxide amorphous materials whose molecular structure, morphology, and optical behavior are at variance with the more common and conventional oxide-based glasses. This study will treat two specific classes of fluoride glasses, namely, the fluorozirconates and the fluorohafnates, in which the network formers are ZrF4 and HfF4, respectively, with modifiers being BaF2 and fluorides of rare earths, group III elements, or alkalis. These glasses exhibit high transparency over a frequency range spanning the mid-IR to the near-UV. The primary goal of this study is to focus on the intrinsic Rayleigh scattering of these glasses. The principles of quasi-elastic and inelastic light scattering in glasses will be presented and discussed in great detail. The application of Rayleigh and Brillouin light scattering to various heavy metal fluoride glasses has resulted in valuable information for understanding the possible scattering mechanisms in these glasses. In addition, Brillouin scattering measurements allowed the calculation of the elastic and elasto-optic (Pockels) coefficients of the same fluoride glasses. The full implications that the scattering behavior has on the possible fiber optic waveguide application of heavy metal fluoride glasses will be discussed. The physical significance of the elastic constants and elasto-optic coefficients will also be considered on the basis of existing theoretical models.

Prospects for heavy-metal fluoride glass optical components

Abstract Infrared transmitting and multispectral glasses are of interest as materials for applications in both the industrial and military sectors. These applications are a result of the wide optical transparency of the glasses. Mid-infrared (MIR) glasses transmit from the UV (∼ 0.3 μm) to the mid-infrared (∼ 7–8 μm). In this paper, the prospects for fabrication and use of heavy metal fluoride (HMF) glasses as fiber and bulk optical components will be discussed. The potential applications, and the problems in glass processing that need to be address to successfully implement them, will be examined in some detail.

Overview Of Infrared Fibers: Prospective Materials, Fabrication Methods And Applications

An overview is presented of IR fibers, including prospective crystalline and vitreous materials; fiber fabrication methods such as drawing from preforms, crucible draw, pedestal growth and extrusion; and applications such as ultralong repeaterless links, IR imaging, and IR power transmission.

Nonlinear optical processes in glass

The surface finishing of x-ray grazing incidence optics is the most demanding area of optical processing, both in terms of metrology and application of optical finishing techniques. This paper discusses the application of specialized metrology and finishing techniques in producing a low x-ray scatter grazing incidence telescope.

Gamma-induced coloring of doped heavy-metal fluoride glasses

Fluorozirconate glass compositions were irradiated with 1 . 1 73 and 1. 333 MeV gamma-rays from a cobalt-60 source to study the influence which fluorine network concentrations sodium doping indium doping cobalt doping cerium doping have on radiation damage. Lower concentrations of nonbridging fluorine ions were found to reduce color-center absorption and indium doping was found to eliminate visible and infrared radiation-induced colorization. 1.

Annealing of Induced Damage in Fluoride Glass Components

Heavy metal fluoride (HMF) glasses are of considerable interest for use as multispectral optical components. HMF glass samples of different compositions were prepared and subjected to different doses of gamma radiation atroom temperature. Optical absorption measurements showed that strong damage occurred in the UV and visible regions and no significant losses were detected in the infrared region.