Abstract: In order to obtain a 1080nm miniaturization, high power, continuous fiber laser, a 915nm semiconductor laser diode (LD)is used as the pump source, and the resonant cavity is composed of two fiber gratings.Combining with beam combiner, stripping mold, collimator and other optical devices, anall fiber laser system is constructed using 12m Yb-doped double cladding fiber as the gain medium. When the pump power is up to 118W, a continuous and stable laser output with a power of 80 Wand an optical conversion efficiency of 68% is obtained experimentally.The laser system is assembled into a self-designed compact cuboid aluminum housing.The total weight of fiber laser is less than 1.8 kg, and the volume is 200mm ×160mm×40mm. It can work stably in environment ranging from －40℃ to 50 ℃.

Key words: laser techniques, fiber laser, all fiber, miniaturization, high power