Laser performance and spectroscopic analysis of optically written channel waveguides in neodymium-doped gallium lanthanum sulphide glass

We present a spectroscopic analysis and laser characterization of optically written waveguides in neodymium-doped gallium lanthanum sulphide (Nd/sup 3+/-Ga:La:S) chalcogenide glass. Uniform channel waveguides were fabricated in Nd/sup 3+/-Ga:La:S by exposure to radiation from a focused UV-laser beam (/spl lambda/=244 nm), producing a refractive index change /spl utri/n/spl ap/+10/sup -3/. The observed laser performance and fluorescence decay were in good agreement with values calculated from a spectroscopic analysis of 85 /spl mu/s for the /sup 4/F/sub 3/2/ lifetime and 5.9/spl times/10/sup -20/ cm/sup 2/ for the emission cross section at 1075 nm. Low threshold laser operation with emission at 1075 nm and a slope efficiency of 17% is demonstrated. The active device is spatially single mode and exhibits up to 8.6 mW of output power and propagation losses of <0.5 dBcm/sup -1/. Waveguide fabrication, photoinduced effects, and optical characterization in terms of spectroscopy, laser performance, and device attenuation are discussed.

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