5 kW all-fiber amplifier based on homemade spindle-shaped Yb-doped fiber
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摘要:
设计了纤芯直径小—大—小变化的“纺锤形”增益光纤，利用该光纤可均衡模式不稳定和受激拉曼散射抑制的矛盾，提升光纤激光器的输出功率。基于自研的纺锤形增益光纤搭建了主振荡功率放大器（MOPA），实现了5 kW的功率输出，放大器光光效率为66.6%，拉曼散射抑制比大于45 dB，M2因子约2.0。通过优化光纤的设计，可以提升激光器的光束质量和效率。
Abstract:To enhance the thresholds of both stimulated Raman scattering and transverse mode instability, we proposed a novel active Yb-doped fiber with a spindle-shaped core and inner-cladding. An all-fiber main oscillator power amplifier (MOPA) was experimentally established based on this homemade fiber. A maximum power of 5 kW was achieved with the optical-to-optical efficiency of 66.6%, Raman-suppression ratio of ＞45 dB and M2 factor of about 2.0. We believe that the brightness and the efficiency of the laser can be improved by optimizing the structure of the Yb-doped fiber.
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Key words:
- fiber laser /
- fiber amplifier /
- tapered fiber /
- stimulated Raman effect /
- transverse mode instability
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图 1 基于纺锤形增益光纤的主振荡功率放大器结构示意图
Figure 1. A schematic of the main oscillator power amplifier based on spindle-shaped Yb-doped fiber
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