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

By A.K. Mairaj, A.M. Chardon, D.P. Shepherd and D.W. Hewak

Abstract

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 (lambda = 244nm), producing a refractive index change Delta.n ~ +10^-3. <br/><br/>The observed laser performance and fluorescence decay were in good agreement with values calculated from a spectroscopic analysis of 85µs for the 4F3/2 lifetime and 5.9 x 10^-20cm^2 for the emission cross-section at 1075nm. Low threshold laser operation with emission at 1075nm and a slope efficiency of 17% is demonstrated. The active device is spatially single-mode and exhibits up to 8.6mW output power and propagation losses of &lt;0.5 dB cm^-1. Waveguide fabrication, photoinduced effects and optical characterization in terms of spectroscopy, laser performance and device attenuation are discussed

Topics: QC, TK
Year: 2002
OAI identifier: oai:eprints.soton.ac.uk:13749
Provided by: e-Prints Soton
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