Stripping of cladding light at different angles: theoretical and experimental studies
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摘要:光纤 器中存在传输角度不同的包层光，为研究腐蚀型包层光剥离器（CLS）对各角度包层光的剥离效果，实验测量了光纤腐蚀段的散射系数，仿真分析了不同传输角度下包层光的剥离度与腐蚀长度的关系。为提供角度分布不同的包层光，搭建两套剥离器测试系统，分别对双包层光纤和无芯光纤制作的包层光剥离器进行实验。在双包层光纤实验中，两系统包层光的最大传输角由10°和8°变为3°12'和3°1'，接近芯中光的最大传输角度为2°27'；在无芯光纤实验中，两系统包层光的最大传输角由11°和8°变为2°9'和2°12'，且随剥离度的增加，最大传输角度趋近于0°，即腐蚀型包层光剥离器能够基本剥离包层光。最后在波长为1 018 nm的同带泵浦 器上对双包层光纤制作的腐蚀型包层光剥离器进行测试，在输入功率为1 136 W情况下，其剥离度为18.3 dB。Abstract:In fiber lasers, there are cladding lights with different transmission angles. In order to study the stripping effects of corroded cladding light strippers(CLS) on cladding light at various angles, we measured the scattering coefficient of the corroded section of the fiber. Meanwhile, we also simulated the relationship between the attenuation and the corrosion length of the cladding light at different transmission angles. To produce cladding light at different angles, we built two sets of stripper test systems:one to test the CLS made of double-clad fiber and one to test the coreless fiber. In the double-clad fiber experiment, the maximum transmission angle of the two-system cladding light was changed from 10° to 3°12' and from 8° to 3°1'. These angles deviate from the maximum transmission angle of light in the core by 2°27'. In the coreless fiber experiment, the maximum transmission angle of the two-system cladding light was changed from 11° to 2°9' and from 8° to 2°12'. The maximum transmission angle approaches 0° as the cladding light attenuation increases. Finally, we tested the corroded cladding light stripper made of double-clad fiber on the tandem-pumped laser with a wavelength of 1 018 nm. The cladding light attenuation was 18.3 dB at an input power of 1 136 W.
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Key words:
- fiber laser/
- high power/
- cladding light stripper/
- transmission angle
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图 2不同传输角度包层光的剩余功率随腐蚀长度变化
Figure 2.Residual power of cladding light at different transmission angles varies with corrosion length
图 4不同传输角度包层光的剥离实验整体结构图，(a)为半导体 器系统，(b)为光纤 器系统
Figure 4.Overall structural diagram of the stripping test of cladding light at different transmission angles. (a)Semiconductor laser system and (b)fiber laser system
图 5剥离度与腐蚀长度关系的实验与仿真对比图
Figure 5.Experimental and simulation comparison graph of the relationship between the cladding light attenuation and the corrosion length
图 6系统B在不同剥离度下，不同角度包层光的功率密度占比
Figure 6.The ratio of the power density of the cladding light with different angles of the system B at different cladding light attenuation
图 8同带泵浦实验输出功率和剥离度随输入功率变化曲线
Figure 8.Curves of output power and cladding light attenuation as a function of input power in the tandem pumping experiment
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