Abstract:
The invention provides an improved glass host for a Pr3+-doped glass 589 nm laser. For this purpose, a fluoroaluminate glass, of certain composition ranges, has been determined per the invention. Results indicate good lasing intensity at 589 nm in such fluoroaluminate glass host, particularly at elevated temperatures. The glass can be in the form of fiber, glass rod, or wave-guide.
Abstract:
Two methods of producing a ceramic reinforced Al-alloy metal-matrix composite are described. The first one comprises the steps of dispersing a ceramic phase (of titanium diboride) in a liquid aluminum or aluminum alloy, mixing the ceramic phase with a cryolite or other fluoride flux powder and melting the mixture together with the aluminum or aluminum alloy phase at a temperature of between 700° and 1000° C. In the second method, the fluoride flux is reduced in situ by either molten aluminum or its alloying elements (Mg, Ca) to yield TiB2 crystallites of different size and size distribution that can be predetermined by fixing the flux and alloy composition and the processing temperature.
Abstract:
A halide glass composition contains iodide and/or bromide. In addition the halide content preferably includes chloride. The preferred metal composition includes no aluminium and 1-10 mole % of (In+Y). These compositions are used as hosts for rare earth lasing dopants, e.g, Pr.sup.3+.
Abstract:
Halide glasses having particular utility as hosts for praseodynmium in order to provide optical amplification by laser activity have a halide content provided as a small proportion, e.g., 1-10 percent, of choride with the remainder as fluoride. The metal content is similar to conventional ZBLAN glasses. The replacement of A1 by Y and In and/or the partial replacement of Na by Cs has synergistic benefits. PR.sup.3+ constitutes a good lasing species for amplifying telecommunication signals at 1300 nm using pumped radiation at 1020 nm.