A solar concentrator in the solar-direct-pumped fiber laser system
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摘要: 为了研究抛物面碟形聚光器实现太阳能直接抽运光纤激光器,根据空间太阳光谱分布特点,采用数值方法,计算了用该聚光器聚集太阳能量抽运双包层光纤激光器时光纤吸收的太阳能量及其吸收效率。计算结果表明,通过采用内包层数值孔径较大、掺杂适当稀土元素的双包层光纤及减小太阳光传输过程中的损耗等措施提高光纤激光器对太阳能的吸收效率,可以实现太阳能直接抽运光纤激光器。通过光纤集束熔锥侧面耦合器构成多模光纤阵列或者聚光器阵列的结构,可进一步提高太阳能抽运功率。Abstract: To investigate the practicability of a solar-directpumped fiber laser by using a parabolic dish concentrator,the solar power absorbed by the fiber laser and its absorption efficiency were calculated with numerical method based on the characteristics of solar spectrum in outer space.Results showed that it was realizable by taking such measures as using high inner-clad numerical aperture,appropriate rare-earth doped double-clad fiber and decreasing transmission loss of sunlight.In this paper,a new structure of multi-mode fiber array or parabolic dish concentrator array combination with tapered fiber bundles was proposed to enhance the solar pump power.
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