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In this paper, we present a passively mode-locked frequency shifted feedback laser in a simple linear cavity design, containing Yb-doped double clad fiber and an acousto-optic modulator (AOM) used in continuous mode as frequency shifter. We report the generation of ultrashort pulses with energies exceeding 100 nJ directly from a fiber oscillator in a remarkably simple setup and containing only normal...
Fiber Bragg grating (FBG) arrays in pure silica four-leaf-clover-shaped suspended core fibers were inscribed with two-beam interference and a deep UV femtosecond laser source. The target fibers are pure silica and do not contain any dopants, nor were they treated with hydrogen before grating inscription. The inscription method is appropriate to measure the effective mode field index of the fiber and...
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