High power, compact, picosecond MOPA based on single trench fiber with single polarized diffraction-limited output.
High power, compact, picosecond MOPA based on single trench fiber with single polarized diffraction-limited output.
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DOI：
10.1364/ol.40.004150
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发表时间：
2015-09
期刊：
影响因子：
3.6
通讯作者：
Deepak Jain;S. Alam;Christophe Codemard;Yongmin Jung;M. Zervas;Jayanta K. Sahu
中科院分区：
文献类型：
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作者：
Deepak Jain;S. Alam;Christophe Codemard;Yongmin Jung;M. Zervas;Jayanta K. Sahu
实验研究了一种芯径为30 μm的全固态掺Yb单沟槽光纤。由于超低NA（0.038）和围绕纤芯的谐振环，测量确保了稳定有效的单模操作，而不需要传统光纤所需的紧密盘绕。全实心和圆柱形设计确保了大规模生产的适用性，并具有全纤维化设备结构的附加优势。利用该光纤制作了一个小型主振荡功率放大器（MOPA），在13.5MHz重复频率下，输出脉冲宽度为23.5ps，脉冲能量为23.8 μJ，峰值功率> 160kW，平均输出功率为252W，斜率效率为76%。输出光束具有大于15 dB的偏振消光比和小于1.15的M2。
We experimentally demonstrate an all-solid Yb-doped 30 μm core diameter single trench fiber. Measurements ensure a robust effective single-mode operation without the need of tight coiling as required for conventional fibers thanks to the ultralow NA (∼0.038) and resonant ring surrounding the core. All-solid and cylindrical design ensures the suitability for mass scale production with the added benefit of all-fiberized device structure. A compact master oscillator power amplifier (MOPA) has been built using this fiber delivering ∼23.5 ps pulses at 13.5 MHz repetition rate delivering up to ∼52 W of average output power corresponding to a pulse energy of ∼3.8 μJ and peak power of >160 kW, while maintaining ∼76% slope efficiency. The output beam exhibits a polarization extinction ratio of more than 15 dB and a M2 less than 1.15.