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首页> 外文期刊>Applied optics >240 W high-average-power square-shaped nanosecond all-fiber-integrated laser with near diffraction-limited beam quality
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240 W high-average-power square-shaped nanosecond all-fiber-integrated laser with near diffraction-limited beam quality

机译：具有近衍射极限光束质量的240 W高平均功率方形纳秒全光纤集成激光器

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摘要

We report an all-fiber-integrated high-average-power square-shaped nanosecond pulse laser operating at 1068 nm based on the master oscillator power amplifier configuration. The seed source is a passively mode-locked Yb-doped fiber laser with fundamental cavity repetition rate of 1.86 MHz. Output pulses with a square shape can be tuned in pulse width from 271 ps to the nanosecond level. The average output power reaches to 9.21 W after three preamplifiers. Finally, a main amplifier is developed to boost the average output power to 240 W, and the corresponding pulse energy and peak power are ～129.3 μJ and 36 kW, respectively. The efficiency of the main amplifier is ～61.3%, and the beam quality represented by M~2 factors is below 1.3 and 1.2 in the X and Y directions.
机译：我们报告了一种基于主振荡器功率放大器配置，工作在1068 nm的全光纤集成的高平均功率方形纳秒脉冲激光器。种子源是无源锁模Yb掺杂光纤激光器，其基本腔重复频率为1.86 MHz。方形输出脉冲的脉冲宽度可以从271 ps调整到纳秒级。经过三个前置放大器后，平均输出功率达到9.21W。最后，开发了一个主放大器，将平均输出功率提高到240 W，相应的脉冲能量和峰值功率分别为〜129.3μJ和36 kW。主放大器的效率约为61.3％，由M〜2因子表示的光束质量在X和Y方向上均低于1.3和1.2。

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