Without germanium doping the photosensitivity was attributed to a great part to the presence of bismuth, without excluding an aluminum contribution. Photosensitivity in pure SiO 2 fiber under 193 nm irradiation has been reported for step index and microstructured fibers and recently for Bi-Al 2O 3 silica based fibers. Photosensitivity in Ge-doped microstructured optical fiber (MOF) has been reported as early as 1999. Therefore it is of prime interest to realize fiber Bragg grating mirrors in the micro-structured fiber as well. Despite the fact that fiber Bragg gratings were realized in a core-size matched germanosilicate fiber, the splicing of microstructured and standard single mode fibers resulted in variable laser slope efficiency. Recently fiber lasing action was demonstrated in pure step index (SI) Bi-SiO 2-core, F-doped inner cladding fiber, while luminescence and lasing were observed in microstructured Bi-SiO 2 optical fibers as well. Lasers have been realized in Bi-Al-co-doped SiO 2 optical fibers with slope efficiencies up to 14% at 1215 nm (pumped at 1064 nm) and in Bi-Ge-co-doped SiO 2 fibers with a slope efficiency up to 60% at 1460 nm (pumped at 1340 nm).

This makes them prime candidates for fiber devices such as lasers, amplifiers and light sources. IntroductionР”В«ismuth doped optical fibers exhibit luminescence over a wide wavelength range. Photosensitivity and luminescence were compared to a Bi-Al 2O 3-SiO 2 core optical fiber. Fiber luminescence was also measured under 1064 nm pumping for both fibers. Average and modulated refractive index changes of 2.7 Р“вЂ” 10 РІв‚¬вЂ™4 and 1.0 Р“вЂ” 10 РІв‚¬вЂ™4 were induced in pristine microstructured fiber while 1.0 Р“вЂ” 10 РІв‚¬вЂ™4 and 0.7 Р“вЂ” 10 РІв‚¬вЂ™4 were observed in the F-doped-cladding fiber.

Note: Author names will be searched in the keywords field, also, but that may find papers where the person is mentioned, rather than papers they authored.Р”Р„n ArF excimer laser was used to fabricate Bragg gratings in fibers with Bi-SiO 2 core and microstructured or F-doped claddings without fiber presensitization.

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Sergey mashinsky