Temperature effect on the Brillouin gain spectra of highly doped aluminosilicate fibers

As a versatile dopant, Al₂O₃ is proving to be pivotal in both high power laser and highly nonlinear fiber applications. Due to its ability to raise the optical index but decrease the acoustic index, it plays an important role in manipulating the optical and acoustic properties of fibers with the view of suppressing stimulated Brillouin scattering (SBS). Three aluminosilicate fibers with different concentrations of Al₂O₃ were fabricated using the in-house developed chemical-in-crucible technique, a novel gas phase deposition method whereby higher concentrations of Al₂O₃ can be deposited in the fiber. We investigate the Brillouin gain spectra (BGS) with a change in Al₂O₃ concentration and with a change in the environmental temperature of the fiber.