Diehl, Colin2014-08-272014-08-272014-06https://hdl.handle.net/1794/1814250 pages. A thesis presented to the Department of Physics and the Clark Honors College of the University of Oregon in partial fulfillment of the requirements for degree of Bachelor of Science, Spring 2014.A high power double-clad Er-Yb doped fiber laser is constructed and characterized. The fiber is cladding pumped by a 10 W 975 run laser diode, and later by a 10 W 915 nm laser diode. The fiber laser generates up to 1.38 W of continuous wave output power at 1550 run, tunable up to 1560 run, with a linewidth near 0.1 run and a slope efficiency of 15%. The fundamentals of laser physics and fiber optics are discussed, as well as the theory behind single-mode, multimode, double-clad, and Er- Yb co-doped fiber.en-USAll Rights Reserved.Fiber LaserLaserDouble-clad FiberSingle-modeHigh PowerErbiiumYtterbiumThesis / Dissertation