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We review our recent work toward designing large mode area fibers for high power applications. We show that appropriately designed doped multimode fibers can be used to provide robust single-mode output when used in fiber laser cavities. Single-mode (SM) fiber mode field diameters of ∼35 μm are demonstrated with record SM pulse energies of 0.5 mJ at 1550 nm with a repetition rate of 200 Hz. Energies...
We have demonstrated a technique capable of controllably producing fiber Bragg gratings with any arbitrary chirp profiles. The technique involves making a taper on the outer cladding of a section of fiber by differential etching along the length of the fiber. A grating is then written over the taper in the usual manner. A strain gradient develops over the taper when a tension is applied to the fiber...
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