femtosecond laser
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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We demonstrate the fabrication and optimization of waveguide Bragg gratings on single-crystal sapphire substrates using femtosecond laser direct writing. The gratings are fabricated using modulated bursts and are embedded inside single-mode depressed cladding waveguides. Through design optimization, and fabrication parameter tuning, a depressed cladding waveguide with a loss of ~0.8 dB/cm and a Bragg grating with a reflectivity of higher than 90% in the telecommunications wavelength band are demonstrated.
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