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We experimentally obtain femtosecond cylindrical vector beams based on a mode-locked fiber laser (MLFL) by using a fused few-mode coupler. Pulses of 300 fs duration with radially and azimuthally polarized modes are directly delivered at the central wavelength of 1566 nm. The fused few-mode fiber coupler inserted inside the cavity acts as a mode converter from LP01 mode to LP11 mode with a wide bandwidth...
We experimentally demonstrate a novel method to couple light from a laser diode to multimode fiber by using an infiber mode adapter, which is constructed with double-cladding fiber. The coupling efficiency is increased and the factors which influence the coupling efficiency are discussed.
We experimentally demonstrate a switchable multiwavelength fiber laser by using an in-fiber Mach-Zehnder interferometer, which is constructed with two double-cladding fibers. Multi-channel outputs are realized and can be controlled by the comb filtering of the in-fiber interference.
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