Laser-diode-pumped fiber laser amplifier for 13 kW high-beam-quality output
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摘要:
光纤耦合半导体激光器（LD）泵浦的光纤激光放大器具有体积小、功质比高、稳定性好等优点，在工业加工和军事国防等诸多领域都有着广泛且重要的应用。然而，受限于器件制作工艺水平及光纤中的受激拉曼效应和模式不稳定效应，LD泵浦的光纤激光放大器难以同时实现高功率及高亮度激光输出。为实现更高功率、更高亮度的光纤激光输出，需要结合现有的器件工艺水平并同时实现对放大器中的受激拉曼散射效应和模式不稳定效应的有效抑制。报道了基于单位自研大模场增益光纤成功实现13 kW功率、高光束质量激光输出。激光器采用主振荡功率放大结构，放大级采用单后向981 nm泵浦自研大模场增益光纤，在总泵浦功率为15 kW时，输出功率达到12.94 kW，光束质量M2因子约为2.85。通过进一步优化器件性能及光纤模式控制，有望实现更高功率、更高亮度的光纤激光输出。
Abstract:Fiber-coupled semiconductor laser (LD)-pumped fiber laser amplifiers have the advantages of small size, high power-to-mass ratio, and good stability. However, limited by the level of device fabrication and the stimulated Raman scattering effect and mode instability (MI) effect inside the fiber, it is difficult for LD-pumped fiber laser amplifiers to achieve high-power and high-brightness laser output at the same time. To achieve higher power and higher brightness fiber laser output, it is necessary to combine the existing device technology and simultaneously realize effective suppression of the SRS and MI effect in the amplifier. Based on this, this paper reports the successful realization of 13 kW power and high beam quality laser output based on a homemade large-mode-area (LMA) gain fiber. The laser adopts the main oscillation power amplifier structure, and the LMA gain fiber is counter-pumped by 981 nm LDs in the amplification stage. When the total pump power is 15 kW, the output power reaches 12.94 kW, and the beam quality M2 factor is about 2.85. By further optimizing the device performance and fiber mode control, it is expected to achieve higher power and higher brightness fiber laser output.
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Key words:
- fiber amplifier /
- high power /
- high brightness /
- mode instability /
- stimulated Raman scattering.
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图 1 LD泵浦的13kW光纤激光放大器结构示意图
Figure 1. Schematic diagram of the LD pumped 13 kW fiber laser amplifier
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