We report third order nonlinear absorption and refraction measurements at 1.20 µm and 1.52 µm on selected gallium lanthanide sulfide-based glasses (Ga:La:S) showing negligible nonlinear absorption and a refractive nonlinearity close to one hundred times that of Si0 2 . Their potential use in telecommunication as base materials for all-optical switching practical devices is evaluated. The addition of a glass modifier to the Ga:La:S matrix has improved thermal and optical properties, resulting in ease of fibre drawing. The nonlinear optical response of this new variant of the Ga:La:S family is studied.

We report the development of a waveguide laser source in a neodymium-doped chalcogenide (Ga:La:S) glass. Channel waveguide structures were directly written via above bandgap (t, .. =244nm) illumination provided by a focused UV-laser beam with fluencies 1.5 -150 J/cm 2 . Effects of photoinduced material modification in the fom1 of surface compaction and photodensification were evident. Characterization revealed a low threshold waveguide laser with emission at 1075 nm and slope efficiency of 15 %. The active device was spatially singlemode and exhibited laser operation with 8.6 mW peak power and attenuation < 0.4 dB cm• 1

Abstract-The authors of this paper investigated the thermal properties and optical properties of typical nonsilica glasses, including viscosity, surface tension, thermal conductivity, transmission, linear and nonlinear refractive index, and fiber attenuation in order to judge the feasibility of using nonsilica glasses as the background material of holey fibers (HFs). Novel techniques were presented to fabricate the nonsilica glass microstructured fiber preforms. Examples of fabricated nonsilica glass HFs with various promising optical applications were finally exhibited.

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Abstract-We present a spectroscopic analysis and laser characterization of optically written waveguides in neodymium-doped gallium lanthanum sulphide (Nd 3+ -Ga:La:S) chalcogenide glass. Waveguide fabrication, photoinduced effects, and optical characterization in terms of spectroscopy, laser performance, and device attenuation are discussed.