| Double-clad fiber lasers have the advantages of compact structure, simple cooling, broad pumping wavelengths, high efficiency, high power, long-life and they are widely used in optical communication, industry process, medical treatment, laser printing and label-making. Because the fiber core sizes are small, fiber lasers are prevented to push to higher output power. Gain-guided, index-antiguided (GG-IAG) fiber is a new type of fiber, which can produce single mode lasing in core sizes as large as hundreds of microns, to avoid this limitation. In this paper, the principal and the recent development of GG-IAG fiber laser are introduced firstly. Then the output characteristics and thermal effects of GG-IAG fiber laser are analyzed. The experimental research of GG-IAG fiber laser is studied in the end. The main work is as follows:1、Based on the model of Ido Kelosn, the rate equations of Yb3+doped GG-IAG fiber laser are get, and the numerical resolution is carried out. The impact of pump power, fiber length and gain distribution on the output power has been studied when the fiber is double-end pumped.2、One point side pumped Yb3+doped GG-IAG fiber laser is analyzed theoretically. The power distribution of laser in fiber, and the relationship between pumping position and output power are obtained for different pump power distributions. Then the multi-point pumped Yb3+doped GG-IAG fiber laser is studied. Compare advantage and disadvantage among different pumping methods.3、Set up heat conduction equations of Yb3+doped GG-IAG fiber laser, and the analytical solutions is obtained by considering the longitudinal heat conduction. Compare the thermal effects between the two pumping methods-end pumped and multi-point pumped.4、Polish the GG-IAG glass fiber end and get good optical quality of the fiber end face. The experimental system of one-end pumped Yb3+doped GG-IAG fber laser is set up. The non-laser reason is analyzed and the solution is also discussed. |
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