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光束质量参数对大功率固体激光器光纤耦合系统的设计起着关键作用。大功率固体激光器输出的为多模激光束,引入等效基模光束来计算多模激光束的光束质量是一种有效的方法,并定义包含光斑能量98%的光斑半径为束宽,以此计算多模激光束的光束质量,是准确有效的。结合大功率固体激光器的光纤耦合原理和光束变换理论设计了高效耦合系统,并对系统内透镜的通光孔径及焦距等参量做了数值优化。实验证明,此光纤耦合系统能够进行大功率固体激光高效率耦合,成功地实现了输入功率为2000W时,耦合效率大于94%的激光输出,并给出了光纤耦合的效率曲线及分析。
The beam quality parameters play a key role in the design of a fiber-coupled system for high-power solid-state lasers. It is an effective method to calculate the beam quality of a multimode laser beam by introducing an equivalent fundamental mode beam into a multi-mode laser beam output by a high-power solid-state laser. The radius of the spot containing 98% of the spot energy is defined as the beam width, Calculating the beam quality of a multimode laser beam is accurate and efficient. The high efficiency coupling system is designed based on the fiber coupling principle and the beam transformation theory of high power solid state laser, and numerical optimization of the aperture and focal length of the lens in the system is optimized. Experiments show that the fiber coupling system is capable of high power solid - state laser coupling with high efficiency. The laser output with the coupling efficiency of more than 94% at 2000W input power is successfully achieved. The efficiency curve and analysis of fiber coupling are given.