高功率双包层光纤激光器受激拉曼散射和热效应的理论研究
Stimulated Raman scattering and thermal effect in high power double clad fiber laser
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摘要: 受激拉曼散射和热效应会限制光纤激光器功率的提高。利用高功率光纤激光器的速率方程和热传导方程，理论研究了双端泵浦和分布泵浦下双包层光纤激光器的受激拉曼散射和热效应，得到了光纤中的泵浦光、激光和斯托克斯光的功率分布，光纤激光器的输出特性以及光纤中的温度分布。分析表明，当泵浦功率增大到一定值时，光纤激光器中出现SRS，一部分激光功率会转移给斯托克斯光，影响激光功率进一步提高;与双端泵浦方式相比，分布泵浦下光纤激光器的斜率效率和最大输出功率相差不大，但是，光纤中的温度分布被有效地降低，因此，分布泵浦方式更为有效。Abstract: Stimulated Raman scattering(SRS) and thermal effect can limit the power scaling of fiber laser. According to rate equations and heat conduction equations, SRS and thermal effect in high power Yb3+ doped double clad fiber laser are studied for two-end pumping and distributed pumping. The power distribution of pump, laser and Stokes in the fiber, the output characteristic of fiber laser, and temperature distribution in the fiber are obtained. The results show that the slope efficiency and maximum output power for distributed pumping are slightly less than the ones for two-end pumping, but the temperature distribution is decreased effectively for distributed pumping. The results are very useful for designing high power fiber lasers.
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Key words:
- high power laser /
- double clad fiber /
- fiber laser /
- pumping method /
- stimulated raman scattering /
- thermal effect
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