Abstract

Stimulated Brillouin scattering (SBS) amplification is obtained in directly written ${\mathrm{As}}_2{\mathrm{S}}_3$ channel waveguides. Centimeter-long waveguides were written using a Ti:sapphire femtosecond laser, operating at a central wavelength of 810 nm. The cross-section of the waveguides was of $4\mathrm{\mu m}\times 1\mathrm{\mu m}$. A Brillouin frequency shift of 7.5 GHz is observed, in general agreement with corresponding previous studies. The SBS gain spectrum in the short waveguides is comparatively broad, with a full width at half-maximum of 200 MHz. We attribute the broad linewidth to the spatial evolution of the electromagnetic field profile along the waveguide.

© 2012 Optical Society of America

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