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

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4 Author(s)
Mairaj, A.K. ; Optoelectron. Res. Centre, Southampton Univ., UK ; Chardon, Alain M. ; Shepherd, David P. ; Hewak, D.W.

We present a spectroscopic analysis and laser characterization of optically written waveguides in neodymium-doped gallium lanthanum sulphide (Nd3+-Ga:La:S) chalcogenide glass. Uniform channel waveguides were fabricated in Nd3+-Ga:La:S by exposure to radiation from a focused UV-laser beam (λ=244 nm), producing a refractive index change ▵n≈+10-3. The observed laser performance and fluorescence decay were in good agreement with values calculated from a spectroscopic analysis of 85 μs for the 4F32/ lifetime and 5.9×10-20 cm2 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-1. Waveguide fabrication, photoinduced effects, and optical characterization in terms of spectroscopy, laser performance, and device attenuation are discussed.

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Selected Topics in Quantum Electronics, IEEE Journal of  (Volume:8 ,  Issue: 6 )