Research on fiber coupling of multi-single emitters diode laser based on beam filling
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摘要: 为了进一步提高多单管半导体激光器的输出功率，通过对常见的阶梯型多单管半导体阵列进行分析，提出在光斑尺寸较小的慢轴方向对光束进行填充，在同样的耦合条件下，使更多的激光能量耦合进光纤中，实现更高功率的输出。文中使用光参数积作为评价光束质量的指标，论证了慢轴光束填充的可行性，利用ZEMAX仿真软件对8路常见阶梯型多单管半导体阵列和12路填充阵列进行对比仿真，在不影响耦合效率的前提下，实现了将12路波长为860 nm、输出功率3 W的单管半导体激光器耦合进芯径105 μm、数值孔径0.22的光纤中，光纤输出功率为33.4 W，光纤耦合效率为92.78%。仿真结果表明，对慢轴方向进行光束填充可以在一定程度上提高多单管半导体激光的功率输出。Abstract: To further improve the output power of the multi-single emitters diode laser, based on the analysis of the common stepped multi-single emitters diode laser array, this paper proposes to fill the beam in the slow axis direction with small spot size, and under the same coupling condition, more laser energy is coupled into the fiber to achieve higher power output. The beam-parameter product is used as the index to evaluate the beam quality, and the feasibility of slow axis beam filling is demonstrated. By using ZEMAX simulation software, the comparison simulation of 8-way ladder type multi-single emitters diode laser array and 12-way filling array is carried out. On the premise of not affecting the coupling efficiency, the 12 single emitters diode laser with center wavelength of 860 nm and output power of 3 W is coupled into a fiber with core diameter of 105 um and numerical aperture of 0.22, the output power is 33.4 W and the coupling efficiency is 92.78%. The simulation results show that the slow axis beam filling can improve the power output of the diode laser to a certain extent.
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Key words:
- single emitter diode laser /
- spatial combination /
- ZEMAX /
- fiber coupling
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图 1 常见的阶梯排列多单管半导体激光器光斑图
Figure 1. Light spot of step arrayed multiple single-tube semiconductor laser
图 4 填充后的多单管半导体激光器阵列光路结构
Figure 4. Multiple single tube semiconductor laser after filling
表 1 LDX Optronics 860 nm芯片参数
Table 1. Parameters of LDX Optronics 860 nm laser diode
d/mm θ/mrad slow axis 0.1 61 fast axis 0.001 6 697 
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表 2 准直前后860 nm快慢轴芯片参数
Table 2. Parameters of LDX Optronics 860 nm
d/mm θ/mrad BPP/（mm∙mrad） slow axis before collimation 0.1 61 3.05 slow axis after collimation 0.7 9.2 3.22 fast axis before collimation 0.001 6 697 0.28 fast axis after collimation 0.2 5.7 0.29
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表 3 两种情况光纤耦合情况
Table 3. Two cases of fiber coupling
power before collimation /W power after collimation /W coupling efficiency /% before filling 24 21.7 90.42 after filling 36 33.4 92.78
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