Since the working medium adopted by the laser generator is in the form of an optical fiber, its features are affected by the transition properties of the optical fiber. The pump light entering the fiber generally has multiple modes, while the signal photoelectric may have multiple modes. Different pump modes have different effects on different signal modes, making the analysis of laser generators and amplifiers more complicated. The doping distribution in the fiber also has a great impact on the laser generator. In order to make the medium have gain characteristics, working ions (that is, impurities) are doped into the fiber. In general, working ions are evenly distributed in the core. However, the distribution of pump light of different modes in the fiber is non-uniform. Therefore, in order to improve the pumping efficiency, the ion distribution and the pumping energy distribution should be as close as possible. When analyzing the laser generator, in addition to the general principle of the laser generator discussed above, it must also consider its own features, introduce different models and adopt special analysis methods to achieve good analysis results.
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