Fiber Bragg grating
The bottom anode in the Direct Current Electric Arc Furnace (DC EAF) is critical for completing the electrical circuit necessary for sustaining the arc within the furnace. For pin-type bottom anodes, monitoring of the temperature of select pins instrumented with thermocouples is performed to track bottom wear in the EAF and inform the operator when the furnace should be removed from service.
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Fiber Bragg grating (FBG) is a key component in high-power fiber lasers. Mirror FBGs can act as cavity mirrors for fiber oscillators, and chirped and tilted fiber Bragg gratings (CTFBGs) can be used as all-fiber spectral filters to suppress nonlinear effects such as stimulated Raman scattering (SRS). Here a pair of mirror FBGs at 1080 nm are inscribed in fibers with a core diameter of 30 μm by femtosecond (fs) -lasers, and a high-power all-fiber oscillator is constructed based on the fs-written mirror FBGs.
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